Resubmissions
31-08-2021 13:22
210831-v7yp62p3a2 1003-08-2021 06:34
210803-w6vry4xe5x 1002-08-2021 18:36
210802-whb9t8hbz6 10Analysis
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max time kernel
80s -
max time network
129s -
platform
windows7_x64 -
resource
win7v20210408 -
submitted
31-08-2021 13:22
Static task
static1
Behavioral task
behavioral1
Sample
Windows.Encryptor.exe
Resource
win7v20210408
Behavioral task
behavioral2
Sample
Windows.Encryptor.exe
Resource
win10v20210410
General
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Target
Windows.Encryptor.exe
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Size
66KB
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MD5
ba375d0625001102fc1f2ccb6f582d91
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SHA1
379ebd1eff6f8685f4ff72657626bf6df5383d87
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SHA256
c6e2ef30a86baa670590bd21acf5b91822117e0cbe6060060bc5fe0182dace99
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SHA512
795b10a638e289729192de6a6d9964b5ad3b8084f84d58da077ca8ec08c8b8cb1acadb5240962d4ccacf66242bab1430923fc77bdbbfacd0badd64df2ba1487f
Malware Config
Extracted
C:\1rWCqamCt.README.txt
blackmatter
http://supp24yy6a66hwszu2piygicgwzdtbwftb76htfj7vnip3getgqnzxid.onion/GDBJS76DH3D4IKQD2QO7R
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 16 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
Windows.Encryptor.exedescription ioc process File opened for modification C:\Users\Admin\Pictures\ApproveExport.tiff.1rWCqamCt Windows.Encryptor.exe File renamed C:\Users\Admin\Pictures\BackupClose.crw => C:\Users\Admin\Pictures\BackupClose.crw.1rWCqamCt Windows.Encryptor.exe File renamed C:\Users\Admin\Pictures\BlockRevoke.crw => C:\Users\Admin\Pictures\BlockRevoke.crw.1rWCqamCt Windows.Encryptor.exe File renamed C:\Users\Admin\Pictures\GetSkip.raw => C:\Users\Admin\Pictures\GetSkip.raw.1rWCqamCt Windows.Encryptor.exe File opened for modification C:\Users\Admin\Pictures\UpdateStart.tif.1rWCqamCt Windows.Encryptor.exe File opened for modification C:\Users\Admin\Pictures\EnableReset.tif.1rWCqamCt Windows.Encryptor.exe File renamed C:\Users\Admin\Pictures\UpdateStart.tif => C:\Users\Admin\Pictures\UpdateStart.tif.1rWCqamCt Windows.Encryptor.exe File renamed C:\Users\Admin\Pictures\WatchConvert.tiff => C:\Users\Admin\Pictures\WatchConvert.tiff.1rWCqamCt Windows.Encryptor.exe File opened for modification C:\Users\Admin\Pictures\WatchConvert.tiff.1rWCqamCt Windows.Encryptor.exe File opened for modification C:\Users\Admin\Pictures\WatchConvert.tiff Windows.Encryptor.exe File opened for modification C:\Users\Admin\Pictures\ApproveExport.tiff Windows.Encryptor.exe File renamed C:\Users\Admin\Pictures\ApproveExport.tiff => C:\Users\Admin\Pictures\ApproveExport.tiff.1rWCqamCt Windows.Encryptor.exe File opened for modification C:\Users\Admin\Pictures\BackupClose.crw.1rWCqamCt Windows.Encryptor.exe File opened for modification C:\Users\Admin\Pictures\BlockRevoke.crw.1rWCqamCt Windows.Encryptor.exe File renamed C:\Users\Admin\Pictures\EnableReset.tif => C:\Users\Admin\Pictures\EnableReset.tif.1rWCqamCt Windows.Encryptor.exe File opened for modification C:\Users\Admin\Pictures\GetSkip.raw.1rWCqamCt Windows.Encryptor.exe -
Sets desktop wallpaper using registry 2 TTPs 2 IoCs
Processes:
Windows.Encryptor.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Control Panel\Desktop\WallPaper = "C:\\ProgramData\\1rWCqamCt.bmp" Windows.Encryptor.exe Set value (str) \REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Control Panel\Desktop\Wallpaper = "C:\\ProgramData\\1rWCqamCt.bmp" Windows.Encryptor.exe -
Suspicious use of NtSetInformationThreadHideFromDebugger 6 IoCs
Processes:
Windows.Encryptor.exepid process 1968 Windows.Encryptor.exe 1968 Windows.Encryptor.exe 1968 Windows.Encryptor.exe 1968 Windows.Encryptor.exe 1968 Windows.Encryptor.exe 1968 Windows.Encryptor.exe -
Modifies Control Panel 3 IoCs
Processes:
Windows.Encryptor.exedescription ioc process Key created \REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Control Panel\International Windows.Encryptor.exe Key created \REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Control Panel\Desktop Windows.Encryptor.exe Set value (str) \REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Control Panel\Desktop\WallpaperStyle = "10" Windows.Encryptor.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
Processes:
Windows.Encryptor.exepid process 1968 Windows.Encryptor.exe 1968 Windows.Encryptor.exe 1968 Windows.Encryptor.exe 1968 Windows.Encryptor.exe -
Suspicious use of AdjustPrivilegeToken 17 IoCs
Processes:
Windows.Encryptor.exevssvc.exedescription pid process Token: SeBackupPrivilege 1968 Windows.Encryptor.exe Token: SeDebugPrivilege 1968 Windows.Encryptor.exe Token: 36 1968 Windows.Encryptor.exe Token: SeImpersonatePrivilege 1968 Windows.Encryptor.exe Token: SeIncBasePriorityPrivilege 1968 Windows.Encryptor.exe Token: SeIncreaseQuotaPrivilege 1968 Windows.Encryptor.exe Token: 33 1968 Windows.Encryptor.exe Token: SeManageVolumePrivilege 1968 Windows.Encryptor.exe Token: SeProfSingleProcessPrivilege 1968 Windows.Encryptor.exe Token: SeRestorePrivilege 1968 Windows.Encryptor.exe Token: SeSecurityPrivilege 1968 Windows.Encryptor.exe Token: SeSystemProfilePrivilege 1968 Windows.Encryptor.exe Token: SeTakeOwnershipPrivilege 1968 Windows.Encryptor.exe Token: SeShutdownPrivilege 1968 Windows.Encryptor.exe Token: SeBackupPrivilege 1892 vssvc.exe Token: SeRestorePrivilege 1892 vssvc.exe Token: SeAuditPrivilege 1892 vssvc.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\Windows.Encryptor.exe"C:\Users\Admin\AppData\Local\Temp\Windows.Encryptor.exe"1⤵
- Modifies extensions of user files
- Sets desktop wallpaper using registry
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Modifies Control Panel
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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Downloads
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memory/1968-60-0x00000000767B1000-0x00000000767B3000-memory.dmpFilesize
8KB
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memory/1968-62-0x00000000005C0000-0x00000000005C1000-memory.dmpFilesize
4KB
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memory/1968-61-0x00000000005C5000-0x00000000005D6000-memory.dmpFilesize
68KB
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memory/1968-63-0x00000000005D6000-0x00000000005D7000-memory.dmpFilesize
4KB