Analysis
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max time kernel
90s -
max time network
108s -
platform
windows7_x64 -
resource
win7-en-20210920 -
submitted
28-10-2021 09:28
Static task
static1
Behavioral task
behavioral1
Sample
v2c.exe
Resource
win7-en-20210920
Behavioral task
behavioral2
Sample
v2c.exe
Resource
win10-en-20211014
General
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Target
v2c.exe
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Size
95KB
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MD5
757139e76fae876ae50dd2c3ac11d5d8
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SHA1
1c150493014d29c1f8a51e397e527f7d7c1476c7
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SHA256
9bae897c19f237c22b6bdc024df27455e739be24bed07ef0d409f2df87eeda58
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SHA512
852febe5dc991fa6dc5ff994b2de18548e98a2f53de903a480ed871d9d25413159b167a3c0ff39175bbf7c339604bb1eccc2f9425415ab16089bc56e3e998974
Malware Config
Extracted
C:\chkvc3MvG.README.txt
blackmatter
http://supp24maprinktc7uizgfyqhisx7lkszb6ogh6lwdzpac23w3mh4tvyd.onion/U6H6RKDF6W3B8XOWL
Signatures
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BlackMatter Ransomware
BlackMatter ransomware group claims to be Darkside and REvil succesor.
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Modifies extensions of user files 3 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
v2c.exedescription ioc Process File opened for modification C:\Users\Admin\Pictures\TraceCopy.png.chkvc3MvG v2c.exe File opened for modification C:\Users\Admin\Pictures\SearchUndo.tiff v2c.exe File renamed C:\Users\Admin\Pictures\TraceCopy.png => C:\Users\Admin\Pictures\TraceCopy.png.chkvc3MvG v2c.exe -
Sets desktop wallpaper using registry 2 TTPs 2 IoCs
Processes:
v2c.exedescription ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3456797065-1076791440-4146276586-1000\Control Panel\Desktop\WallPaper = "C:\\ProgramData\\chkvc3MvG.bmp" v2c.exe Set value (str) \REGISTRY\USER\S-1-5-21-3456797065-1076791440-4146276586-1000\Control Panel\Desktop\Wallpaper = "C:\\ProgramData\\chkvc3MvG.bmp" v2c.exe -
Suspicious use of NtSetInformationThreadHideFromDebugger 6 IoCs
Processes:
v2c.exepid Process 2012 v2c.exe 2012 v2c.exe 2012 v2c.exe 2012 v2c.exe 2012 v2c.exe 2012 v2c.exe -
Modifies Control Panel 3 IoCs
Processes:
v2c.exedescription ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3456797065-1076791440-4146276586-1000\Control Panel\Desktop\WallpaperStyle = "10" v2c.exe Key created \REGISTRY\USER\S-1-5-21-3456797065-1076791440-4146276586-1000\Control Panel\International v2c.exe Key created \REGISTRY\USER\S-1-5-21-3456797065-1076791440-4146276586-1000\Control Panel\Desktop v2c.exe -
Modifies registry class 5 IoCs
Processes:
v2c.exedescription ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\chkvc3MvG\DefaultIcon\ = "C:\\ProgramData\\chkvc3MvG.ico" v2c.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\.chkvc3MvG v2c.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\.chkvc3MvG\ = "chkvc3MvG" v2c.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\chkvc3MvG\DefaultIcon v2c.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\chkvc3MvG v2c.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
Processes:
v2c.exepid Process 2012 v2c.exe 2012 v2c.exe 2012 v2c.exe 2012 v2c.exe -
Suspicious use of AdjustPrivilegeToken 17 IoCs
Processes:
v2c.exevssvc.exedescription pid Process Token: SeBackupPrivilege 2012 v2c.exe Token: SeDebugPrivilege 2012 v2c.exe Token: 36 2012 v2c.exe Token: SeImpersonatePrivilege 2012 v2c.exe Token: SeIncBasePriorityPrivilege 2012 v2c.exe Token: SeIncreaseQuotaPrivilege 2012 v2c.exe Token: 33 2012 v2c.exe Token: SeManageVolumePrivilege 2012 v2c.exe Token: SeProfSingleProcessPrivilege 2012 v2c.exe Token: SeRestorePrivilege 2012 v2c.exe Token: SeSecurityPrivilege 2012 v2c.exe Token: SeSystemProfilePrivilege 2012 v2c.exe Token: SeTakeOwnershipPrivilege 2012 v2c.exe Token: SeShutdownPrivilege 2012 v2c.exe Token: SeBackupPrivilege 2020 vssvc.exe Token: SeRestorePrivilege 2020 vssvc.exe Token: SeAuditPrivilege 2020 vssvc.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\v2c.exe"C:\Users\Admin\AppData\Local\Temp\v2c.exe"1⤵
- Modifies extensions of user files
- Sets desktop wallpaper using registry
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Modifies Control Panel
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2012
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2020