The malware will only use the second one if it cannot create the crypto context or has some problem with the crypto api functions. The remaining properties Description, Usage, and Examples are optional. This is not uncommon. Attempt to re-run the backups. Podcast Safety Tips, Blog Other Blogs McAfee Labs Clop Ransomware. This will list the amount of storage used. FIGURE 11. This disk space can be reclaimed by using the vssadmin command in an elevated MS-DOS command prompt. Crescendo uses these values to create the comment-based help for the cmdlet when it creates the module. RELATED: (Set the size of the Shadows Copies storage. The second thread created has the task of enumerating all network shares and crypts files in them if the malware has access to them. This malware has a lot of changes per version that avoid making a normal vaccine using mutex, etc. With this property, Crescendo adds the [SupportsShouldProcess()] attribute to the cmdlet, which automatically adds the -WhatIf and -Confirm parameters. Now the names are for the tape: and the atom . A) Type the command below you want to use into the elevated command prompt, press Enter, and go to step 8 below. Deep Excel-based malware has been aroundfor decadesandhas beeninthelimelight in recent years. Shadow storage space is used for system restore points and by Macrium Reflect. Resize Shadow Storage to Delete. The VssAdmin.psm1 file contains all the cmdlets that Crescendo generated from the configuration and the Output Handler functions I wrote to parse the output into objects. It is important to remember that this string remains in plain text in the binary but, as it has changed, it cannot be used for a Yara rule. This threads first action is to create a file called Favorite in the same folder as the malware. In 2021 ransomware attacks have been dominant among the bigger cyber security stories. Once the configuration file was complete, I used the Export-CrescendoModule cmdlet to create my VssAdmin module. Move the VSS data to another NTFS drive (vssadmin add shadowstorage /for=c: /on=d: /maxsize=30%); then you can us LIST SHADOWS ALL otherwise, the CSV volumes will not show his shadows. Another change is the file created; the first version creates the file with the name Favourite but this version creates this file with the name Comone. Found insidevssadmin command Comments | Queries the progress of the in-progress previous version restore operations. The shadow copy is identified by the GUID (which is obtained from the wssadmin list shadows command). The Clop ransomware is usually packed to hide its inner workings. S0244 : Comnie : Comnie collects the hostname of the victim machine. The name of the file created is HotGIrls. Found inside Backup Volume Shadow Copy Services (VSS), Role and applicationspecific backups volume shadow copy snapshots, Vssadmin, the network Vssadmin create shadow /For=C: command, Exercise 6: Use Vssadmin Vssadmin list providers command, Found inside Page 91Then we just specify the link location and the location of the volume shadow copy. Volume Serial Number is AC13-C61F Directory of C:\ File Not Found C:\Windows\system32>vssadmin list shadows vssadmin 1.1 - Volume Shadow Copy Service Deletion by ID must specify a valid snapshot ID, deletion by volume must specify a valid Windows volume (e.g. We also use vssadmin to obtain our snapshots - we do NOT use the VSS GUI in Windows. Running the command 'vssadmin list shadows' will display a list of snapshots on your system along with associated ID. it mimics the Ryuk ransomware and contains similarities with BitPaymer, however the code and functions are quite different between them. The Crescendo configuration file defines the interfaces of cmdlets that you want Crescendo to create. Fighting new Ransomware Techniques with McAfees Latest Innovations, An Overall Philosophy on the Use of Critical Threat Intelligence, Hancitor Making Use of Cookies to Prevent URL Scraping, SBPIMSvc.exe (Sunbelt AntiMalware antivirus product), SBAMSvc.exe (GFI AntiMalware antivirus product), VipreAAPSvc.exe (Vipre antivirus product). The following KB article will help with launching an elevated command prompt. Fully updated for Windows Server 2012 R2! Prepare for Microsoft Exam 70-412and help demonstrate your real-world mastery of advanced configuration tasks for Windows Server infrastructure. The 3ea56f82b66b26dc66ee5382d2b6f05d sample has the following points of difference: Sample 846f93fcb65c9e01d99b867fea384edc , has these differences: As the reader can understand, Clop changes very quickly in strings and name of resources to make it more complex to detect the malware. The first change is some changes in the strings in plain text of the code to make the execution in the EraseTape call and FindAtomW call more slowly. The name of the batch file is clearsystems-10-1.bat. Then, increase the VSS storage area using vssuirun.exe (on Windows Servers) or vssadmin and set all limits to unbounded: vssadmin resize shadowstorage /for=c: /on=c: /maxsize=unbounded. The following expert rule can be used to prevent the malware from deleting the shadow volumes with vssadmin (vssadmin Delete Shadows /all /quiet). New resource name for the batch file. Below, the first 38 hashes with the associated process names. With the handle of this thread, it will wait for an infinite amount of time to finish with the WaitForSingleObject function and later return to the winMain function and exit. In the screenshot BOOT is a correct name for the hash, but the others are collisions. We will now force VSS to always use Microsoft Software Shadow Copy provider by making the following registry entries: Click Start, click Run, type regedit, and then click OK. FIGURE 8. However, the algorithm of crypto of the files and the mark in the file crypted is the same. Do the above optimization for all drives you have, especially the system drive and the drive containing the VMDKs. This important book includes information explaining how to: Build redundance and resilience into your processes and networks Phish-proof your organization and train your people to be aware of external threats Manage and control your data This article will show you what system error memory dump files are and how to delete them when the normal disk cleanup utility cannot help you. The following JSON defines the Resize-VssShadowStorage cmdlet. However, the algorithm to decrypt this resource is the same, except that they changed the big string that acts as a key for the bytes. Later the thread will make a dummy call to the function EraseTape with a handle of 0, perhaps to disturb the emulators because the handle is put at 0 in a hardcoded opcode, and later a call to the function DefineDosDeviceA with an invalid name that returns another error. This definition also has SupportsShouldProcess set to true. An example of deleting by ID follows: C:\Users\Dev>vssadmin delete shadows /shadow={42bb9090-723c-4107-8954-92006026defd}. It is typical in malware that tries to hide what processes they are looking for. These restore points create snapshots that reside in an area of the disk and consume disk space. To not be prompted by any of the commands use the /quiet flag. Found inside Page 407Befehlszeile vssadmin list shadows Beschreibung Listet alle Wiederherstellungspunkte auf, die momentan auf Lscht alle Wiederherstellungspunkte auf dem Laufwerk C. vssadmin delete shadows /For=C: /all vssadmin delete shadows /For=C: Found inside Page 186 domain controller with the domain admin credentials I have and issue the Windows command vssadmin list shadows to new VSC of the C: drive on the Capsulecorp Pentest domain controller: vssadmin create shadow /for=C: Probably the The name of the bat file is resort0-0-0-1-1-0-bat. Related Articles, References, Credits, or External Links. These operations will make a loop for 666000 times. The malware contains 61 hard-coded hashes of programs such as STEAM.EXE, database programs, office programs and others. To increase its size, enter vssadmin resize shadowstorage /For=C: /MaxSize=5%. vssadmin resize shadowstorage /for=c: /on=c: /maxsize=401MB, vssadmin resize shadowstorage /for=c: /on=c: /maxsize=unbounded, vssadmin resize shadowstorage /for=d: /on=d: /maxsize=401MB, vssadmin resize shadowstorage /for=d: /on=d: /maxsize=unbounded, vssadmin resize shadowstorage /for=e: /on=e: /maxsize=401MB, vssadmin resize shadowstorage /for=e: /on=e: /maxsize=unbounded, vssadmin resize shadowstorage /for=f: /on=f: /maxsize=401MB, vssadmin resize shadowstorage /for=f: /on=f: /maxsize=unbounded, vssadmin resize shadowstorage /for=g: /on=g: /maxsize=401MB, vssadmin resize shadowstorage /for=g: /on=g: /maxsize=unbounded, vssadmin resize shadowstorage /for=h: /on=h: /maxsize=401MB, vssadmin resize shadowstorage /for=h: /on=h: /maxsize=unbounded, bcdedit /set {default} recoveryenabled No, bcdedit /set {default} bootstatuspolicy ignoreallfailures, net stop Sophos Device Control Service /y, net stop Sophos System Protection Service /y, net stop MSSQLFDLauncher$PROFXENGAGEMENT /y, net stop MSSQLFDLauncher$SBSMONITORING /y, net stop Veeam Backup Catalog Data Service /, net stop McAfeeFrameworkMcAfeeFramework /y, net stop Sophos File Scanner Service /y. Found insideViewing Shadow Copy Information VSSAdmin provides several utility commands for viewing shadow copy information. The most useful are List Shadows and List ShadowStorage. List Shadows lists the existing shadow copies on a volume. Chimera has used fsutil, fsinfo drives systeminfo, and vssadmin list shadows for sytesm information including shadow volumes and drive information. The next change is the hardcoded public key of the malware that is different to the previous version. Packer signed to avoid av programs and mislead the user. On the other hand, we also noticed some weird decisions when it came to coding certain functionalities in the ransomware. Found inside Page 167ber den Konsolenbefehl vssadmin list shadows lassen sich die Volumenschattenkopien auflisten und mit vssadmin delete shadows auch lschen. Mit vssadmin Resize ShadowStorage /On=C: /For=C: /MaxSize=5GB wird die Gre des Bereichs fr In this post, I explain the details of a cmdlet definition in the Crescendo JSON configuration file. And with tools like Visual Studio Code (VS Code), the schema provides IntelliSense, making it easier to author. Execution through API (Batch file for example). Since there are three parameters sets, I need to define an output handler for each set. Clop is constantly evolving and even though we do not know what new changes will be implemented in the future, McAfee ATR will keep a close watch. If the issue still persists, open Command Prompt again and enter vssadmin delete shadows /all command. The file created has the name clearsystems-11-11.bat. This function will return 1 or 0, 1 if it belongs to Russia or another CIS country, or 0 in every other case. Found inside Page 121Voici les autres commandes possibles : j vssadmin list providers : affiche le nom, le type, l'ID de fournisseur et la Par dfaut, ces lignes s'affichent : Fournisseur : 'Microsoft Software Shadow Copy provider 1.0' Type de Based on the versions of Clop we discovered we detected telemetry hits in the following countries: The function to check a file or a folder name using the custom hash algorithm can be a problem for the malware execution due if one of them is found in execution, the malware will avoid it. C ++ support virtual function. Step 4. The next action is to search for some processes with these names: If some of these processes are discovered, the malware will wait 5 seconds using Sleep and later another 5 seconds. In my previous post, I looked at the details of a Crescendo output handler from my VssAdmin module. S0106 : cmd : cmd can be used to find information about the operating system. Finally make sure all shadows have been removed with the following command. Found inside Page 168Type the following to see a list of existing volume shadow copies: c:\vssadmin list shadows 7. To list the volumes that are eligible for shadow copies, enter the following: c:\vssadmin list volumes 8. To view used, allocated, Q: I have a bunch of scripts we use in production that make use of Windows credentials. This behavior is normal in ransomware but the previous check against hardcoded hashes based on the file/folder name is weird because later, as we can see in the above picture, the next check is against plain text strings. To see the amount ofstorage space allocated and used for Volume Shadow Copies run thefollowing command from a command prompt with elevated privileges: To allocate more storage (e.g. The next action is to write this batch file in the same folder where the malware stays with the function CreateFileA. Later it will generate a random AES key and crypt each byte of the file with this key, next it will put the mark Clop^_ at the end of the file, after the mark it will put the key used to crypt the file ciphered with the master RSA key that has hardcoded the malware to protect it against third party free decryptors. File and directory discovery: to search files to encrypt. FIGURE 10. C:\Users\Dev>vssadmin delete shadows /shadow={42bb9090-723c-4107-8954-92006026defd} To not be prompted by any of the commands use the /quiet flag. This book will appeal to computer forensic and incident response professionals, including federal government and commercial/private sector contractors, consultants, etc. San Jose, CA 95002 USA. The second version found by the end of February has some changes if it is compared with the first one. For example: Lets take a look at the help for vssadmin Resize ShadowStorage. The Export-CrescendoModule cmdlet creates a new module containing the cmdlets defined in the configuration (complete with the help text provided) and the output handler functions required by the cmdlets. Social Network Account Stealers Hidden in Android Gaming Hacking Tool, Malicious PowerPoint Documents on the Rise, Android malware distributed in Mexico uses Covid-19 to steal financial credentials, PhishingAndroidMalwareTargets Taxpayers inIndia, The Rise of Deep Learning for Detection and Classification of Malware. In this example, the vssadmin list providers command has no additional parameters. These simple cmdlets dont require any input to return the requested information. Delete the shadow volumes with vssadmin (vssadmin Delete Shadows /all /quiet). But so does, PowerShell. if you want, you can delete the shadows using DELETE SHADOWS ID 50GB) run the following command: vssadmin resize shadowstorage /For=C: /On=C: /MaxSize=50GB. Those blacklisted extensions will help the system avoid crashing during the encryption compared with other ransomware families. This blog will explain the technical details and share information about how this new ransomware family is working. The key for the XOR operation to decrypt the ransom note and the batch file is: The batch file is different to the other versions, in this case not changing the boot config of the target victim. Found inside Page 288Sur un systme Vista actif, la commande suivante permet d'obtenir la liste des clichs instantans de volume disponibles : C:\>vssadmin list shadows /for=c:\ Aprs avoir obtenu cette liste, nous pouvons crer un lien symbolique vers Found inside Page 343ber den Konsolenbefehl vssadmin list shadows lassen sich die Volumenschattenkopien auflisten und mit vssadmin delete shadows auch lschen . Mit vssadmin Resize ShadowStorage / On = C : / For = C : / MaxSize = 5GB wird die Gre des After this, it will make 2 threads, one of them to search for processes and the another one to crypt files in the network shares that it has access to. A: Use the $FormatEnumerationLimit A closer look at a Crescendo Output Handler, The cmdlets take input using sets of parameters, Cmdlets that make changes to the system support, A closer look at a Crescendo configuration file this post. Prepare for Microsoft Exam 70-698and help demonstrate your real-world mastery of Windows 10 installation and configuration. Copyright Paramount
To get the shadow copy ID, use the vssadmin list shadows command. The handlers receive the output of the native command and return an object containing the data parsed from the output. McAfee ENS customers can create expert rules to prevent batch command execution by the ransomware. The following Microsoft KB article will provide further information regarding vssadmin delete shadows. If this happens with a folder, all the files inside that folder will be skipped as well. bc59ff12f71e9c8234c5e335d48f308207f6accfad3e953f447e7de1504e57af, 31829479fa5b094ca3cfd0222e61295fff4821b778e5a7bd228b0c31f8a3cc44, 35b0b54d13f50571239732421818c682fbe83075a4a961b20a7570610348aecc, e48900dc697582db4655569bb844602ced3ad2b10b507223912048f1f3039ac6, 00e815ade8f3ad89a7726da8edd168df13f96ccb6c3daaf995aa9428bfb9ecf1, 408af0af7419f67d396f754f01d4757ea89355ad19f71942f8d44c0d5515eec8, 0d19f60423cb2128555e831dc340152f9588c99f3e47d64f0bb4206a6213d579, 7ada1228c791de703e2a51b1498bc955f14433f65d33342753fdb81bb35e5886, 8e1bbe4cedeb7c334fe780ab3fb589fe30ed976153618ac3402a5edff1b17d64, d0cde86d47219e9c56b717f55dcdb01b0566344c13aa671613598cab427345b9, cff818453138dcd8238f87b33a84e1bc1d560dea80c8d2412e1eb3f7242b27da, 929b7bf174638ff8cb158f4e00bc41ed69f1d2afd41ea3c9ee3b0c7dacdfa238, 102010727c6fbcd9da02d04ede1a8521ba2355d32da849226e96ef052c080b56, 7e91ff12d3f26982473c38a3ae99bfaf0b2966e85046ebed09709b6af797ef66, e19d8919f4cb6c1ef8c7f3929d41e8a1a780132cb10f8b80698c8498028d16eb, 3ee9b22827cb259f3d69ab974c632cefde71c61b4a9505cec06823076a2f898e. This can be handy if your PC isn't working well and you recently installed an app, driver, or update. As the algorithm and the hash is based on 32bits and only in upper case characters, it is very easy to create a collision as we know the target hashes and the algorithm. Now we will talk about the changes of some samples to see how prolific the ransomware Clop is. If these processes are not detected, it will access to their own resources and extract it with the name OFFNESTOP1. JSON provides an expressive, structured syntax for defining the properties of objects. This thread runs in an infinite loop with a wait using the function Sleep per iteration of 30 minutes. 9. This function returns the user keyboard input layout at the moment the malware calls the function. vssadmin resize shadowstorage /For=C: /On=E: /MaxSize=5GB. Batch file name clearnetworksdns-11-22-33.bat. Found inside Page 400[Active Directory ] A. VssAdmin create shadow B. VssAdmin delete shadows C. VssAdmin list shadow D. VssAdminadd shadowstorage In this thread the first action is to remove the error mode with SetErrorMode to 1 to avoid an error dialog being shown to the user if it crashes. Of course, the malware checks that the file does not have the name of the ransom note and the extension that it will put in the crypted file. Crescendo separates the structural interface code required to create a cmdlet from the functional code that extracts the data. The OutputHandlers property is an array containing one or more handler definitions. If it is the charset used, the malware will delete itself from the disk and terminate itself with TerminateProcess but if it is not this charset, it will continue in the normal flow This double check circumvents users with a multisystem language, i.e. The DefineDosDeviceA name is 1234567890. You may have inadvertently allocated a drive letter to the Microsoft System Reserved partition (MSR) or you may have too many restore points on your system. Also, since the command makes changes, I thought I should call Get-VssShadowStorage to show the new settings. Found inside Page 161Nombre de proveedor 'Microsoft Software Shadow Copy provider 1.0' Tipo de proveedor: Sistema Id. de proveedor: {b5946137-7b9f-4925-af80-51abd60b20d5} Versin: 1.0.0.7 c) Listar los volmenes vlidos para instantneas. VSSADMIN LIST 6. vssadmin delete shadows /for=c: /all. Found inside Page 96You also can specify a specific shadow copy to delete by using /Shadow=ID, where ID is the hexadecimal number you obtain through the List Shadows command, covered later in this section. vssadmin Delete ShadowStorage /For=C: /On=D: This As the only complete reference for Windows command line utilities, this book take an in-depth look at the often-overlooked utilities accessible through the command line in Windows Vista, 2003, XP, and 2000. The next change is the mutex name. It will call directly to the prompt of the system without waiting for the malware to finish. Earlier in this blog we have highlighted some interesting choices the developers made when it came to detecting language settings, processes and the use of batch files to delete the shadow volume copies. : C:) and deletion of oldest snapshot simply removes the single, oldest snapshot on the system. In this version it is HappyLife^_-, so, can it be complex to make a vaccine based on the mutex name because it can be changed easily in each new sample. (see screenshots below) Another difference with other ransomware families is that Clop will only cipher the disk that is a physical attached/embedded disk (type 3, FIXED or removable (type 2)). Access to the first resource crypted. vssadmin Resize ShadowStorage VSS vssadmin Resize ShadowStorage /For=C: /On=C: /MaxSize=900MB You could have a separate function for each set. There are some variants of the Clop ransomware but in this report, we will focus on the main version and highlight part of those variations. The Microsoft System Reserved (MSR) partition is required to boot Windows 7 and later operating systems. Step 5. Deletes the shadow copy specified by ShadowID. Software UK Ltd 2006-2014, all rights reserved, VSS Error: 0x8004231f - Failed to Create Volume Snapshot, "How to remove a drive letter from the - MS System Reserved partition", http://kb.macrium.com/KnowledgebaseArticle50162.aspx, How to remove a drive letter from the - MS System Reserved partition.
FIGURE 14. Clearly over the last few months we have seen more innovative techniques appearing in ransomware. The vssadmin Resize ShadowStorage command has three required parameters, but the third parameter /MaxSize can take three different types of input. Later, it will prepare the path to the file from the struct passed as argument to the thread and change the attributes of the file to ARCHIVE with the function SetFileAttributesW, however the malware does not check if it can make this action with success or not. The malwarestealssensitive financial and private informationvia Co-written byCatherine Huang, Ph.D.andAbhishekKarnik Artificial Intelligence (AI)continues to evolveandhas made hugeprogressover the lastdecade. Customers of McAfee gateway and endpoint products are protected against this version. Solution 11 Add a printer manually. We found in the analysis some unique functions compared with other ransomware families. Example of ransom note of the first version of the malware. After those sleep, the malware will continue with their normal flow. Found inside Page 56C:\>vssadmin list shadows /for=d: Once you know which VSC you'd like to access, you can use the mklink command to create a symbolic link to that VSC. Remember, you must be sure that the VSC identifier (i.e., \\? PrintNightmare. That resource is encrypted but has inside a .bat file. Few users reported that this issue occurs while trying to add a printer. AIshapes our daily lives. 0x8004231f - Failed to Create Volume Snapshot, Solution 1 - Remove drive letters allocated unnecessarily to small partitions, Solution 2 - Increase shadow storage space. Having a schema ensures that the syntax of your definition is correct. So why use JSON and not a PowerShell data (PSD1) file? With this practical book, youll learn how easily ransomware infects your system and what steps you can take to stop the attack before it sets foot in the network. Using bcedit program to disable the recovery options in the boot of the machine and set to ignore any failure in the boot warning the user. Filemark in the crypted file and key used ciphered. Found inside Page 339Type the following command and press Enter to list all volumes that are eligible for shadow copies: Vssadmin list volumes 5. Type the following command and press Enter to create a new volume shadow copy: Vssadmin create shadow /For=C: 6 If your computer has shadow copies, type vssadmin delete shadows /for=C: /quiet command and hit Enter. 8. If it finds one of them it will terminate it with TerminateProcess function after opening with the rights to make this action with OpenProcess function. It is clear that the authors are not experienced programmers because they are using a .bat file for the next actions: All these actions could have been performed in the malware code itself, without the need of an external file that can be detected and removed. /quiet: Specify no messages return after finishing the command. > vssadmin list providers; Confirm if there is a 3rd party provider on the machine. Found inside Page 2-144TABLE 3-12 Deleting restore points using vssadmin Command Line Description vssadmin list shadows List restore points are without confirmation. vssadmin delete shadows/For=C:/all Delete All Restore Points On C: Drive. vssadmin delete We can solve this by creating three different parameters, each used in a different parameter set. If a drive letter is assigned then this can cause problems with Microsoft Volume Shadow copy Service (VSS). The first step is to check the name of the folder/file found against a hardcoded list of hashes with the same algorithm used to detect the processes to close. Found inside Page 44C:\Windows\system32>bcdedit /copy {current} /d "Windows 2008 R2" The entry was successfully copied to {63b38b1e-..-001c23449a2b}. C:\Windows\system32>bcdedit /set {63b38b1e-. differentialsnapshot,. run. the. vssadmin list shadows Process discovery: enumerating all processes on the endpoint to kill some special ones. If the value is 0 it means that the mutex was created for this instance of the malware but if it gets another value, it means that the mutex was made from another instance or vaccine and, in this case, it will finish the execution of the malware. This book will appeal to forensic practitioners from areas including incident response teams and computer forensic investigators; forensic technicians from legal, audit, and consulting firms; and law enforcement agencies. The answer is simple: schema! The Crescendo configuration file is a JSON file containing an array of cmdlet definitions. The example below will take a snapshot of the C: drive. It is not required for these partitions to have drive letter associations and allocating a drive letter can cause VSS to fail.. For more information on correcting this please see this article:
Found insideShadow Copy needs to be able to make two versions of the file accessible: one that is currently in use by the You can use this tool to run the following commands: Vssadmin List Providers Lists registered Volume Shadow Copy providers It also creates a proper module manifest, complete with exports for the new cmdlets. Found inside Page 673,, ( ..13.2): C:\>vssadmin List Now the string is: JLKHFVIjewhyur3ikjfldskfkl23j3iuhdnfklqhrjjio2ljkeosfjh7823763647823hrfuweg56t7r6t73824y78Clop. The code that is supposed to delete the ransomware from the disk contains an error. Check the text charset and compare with Russian charset. The same counts for the name of the resources and also for the hash of the resource because the bat changes per line in some cases and in another as it will have more code to stop services of products of security and databases. The interesting part starts in the parameter definitions. The malware checks that the layout is bigger than the value 0x0437 (Georgian), makes some calculations with the Russian language (0x0419) and with the Azerbaijan language (0x082C). Babuk: Biting off More than they Could Chew by Aiming to Encrypt VM and *nix Systems? We also observed that the .BAT files were not present in earlier Clop ransomware versions. A few examples are given below for reference. We are not absolutely sure why this is, but it might be an effort to improve victim tracking. The code largely remains the same but changing the strings can make it more difficult to detect and/or classify it correctly. Note: The same is also true of OEM utility partitions such as DELL utility partitions. How to See List of All Available System Restore Points in Windows System protection (if turned on) is a feature that allows you to perform a system restore that takes your PC back to an earlier point in time, called a system restore point.
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