Analysis
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max time kernel
95s -
max time network
105s -
platform
windows10-2004_x64 -
resource
win10v2004-20220414-en -
submitted
26-06-2022 19:23
Static task
static1
Behavioral task
behavioral1
Sample
new.exe
Resource
win10v2004-20220414-en
General
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Target
new.exe
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Size
1.1MB
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MD5
d702283d42749f52e768fa9c165cf86c
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SHA1
5f4192ff492f378ee68c51d55917833bf4f39ea9
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SHA256
e4e1c1cbe9781f631c2339fd392e22f73d6841a75572d1a9410a967478e61507
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SHA512
794164422c48c7c916fda2ec6fc9ba03e46acdca2ca698b82e71e202ba9eeae336ce2bdb4b5f08bbd678372f2b96cfe1ed945ea1295355a4ced2996904f9c0ef
Malware Config
Extracted
C:\BSMASUNMGK-DECRYPT.txt
http://gandcrabmfe6mnef.onion/3e5ddf0538f5e33e
Signatures
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GandCrab Payload 1 IoCs
Processes:
resource yara_rule behavioral1/memory/1560-132-0x0000000000400000-0x0000000000428000-memory.dmp family_gandcrab -
Gandcrab
Gandcrab is a Trojan horse that encrypts files on a computer.
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suricata: ET MALWARE [eSentire] Win32/GandCrab v4/5 Ransomware CnC Activity
suricata: ET MALWARE [eSentire] Win32/GandCrab v4/5 Ransomware CnC Activity
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Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Modifies extensions of user files 4 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
wermgr.exedescription ioc process File renamed C:\Users\Admin\Pictures\RequestUnprotect.raw => C:\Users\Admin\Pictures\RequestUnprotect.raw.bsmasunmgk wermgr.exe File renamed C:\Users\Admin\Pictures\SplitMount.tif => C:\Users\Admin\Pictures\SplitMount.tif.bsmasunmgk wermgr.exe File renamed C:\Users\Admin\Pictures\BackupUnpublish.raw => C:\Users\Admin\Pictures\BackupUnpublish.raw.bsmasunmgk wermgr.exe File renamed C:\Users\Admin\Pictures\FindWait.tif => C:\Users\Admin\Pictures\FindWait.tif.bsmasunmgk wermgr.exe -
Drops startup file 2 IoCs
Processes:
wermgr.exedescription ioc process File created C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\BSMASUNMGK-DECRYPT.txt wermgr.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\38f5e4dd38f5e33e712.lock wermgr.exe -
Enumerates connected drives 3 TTPs 24 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
Processes:
wermgr.exedescription ioc process File opened (read-only) \??\N: wermgr.exe File opened (read-only) \??\P: wermgr.exe File opened (read-only) \??\W: wermgr.exe File opened (read-only) \??\E: wermgr.exe File opened (read-only) \??\F: wermgr.exe File opened (read-only) \??\I: wermgr.exe File opened (read-only) \??\L: wermgr.exe File opened (read-only) \??\O: wermgr.exe File opened (read-only) \??\S: wermgr.exe File opened (read-only) \??\Z: wermgr.exe File opened (read-only) \??\B: wermgr.exe File opened (read-only) \??\H: wermgr.exe File opened (read-only) \??\J: wermgr.exe File opened (read-only) \??\M: wermgr.exe File opened (read-only) \??\R: wermgr.exe File opened (read-only) \??\U: wermgr.exe File opened (read-only) \??\V: wermgr.exe File opened (read-only) \??\X: wermgr.exe File opened (read-only) \??\T: wermgr.exe File opened (read-only) \??\Y: wermgr.exe File opened (read-only) \??\A: wermgr.exe File opened (read-only) \??\G: wermgr.exe File opened (read-only) \??\K: wermgr.exe File opened (read-only) \??\Q: wermgr.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
Processes:
wermgr.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\\\pidor.bmp" wermgr.exe -
Drops file in Program Files directory 29 IoCs
Processes:
wermgr.exedescription ioc process File opened for modification C:\Program Files\LimitInvoke.xsl wermgr.exe File opened for modification C:\Program Files\RenameCheckpoint.tmp wermgr.exe File opened for modification C:\Program Files\SplitGroup.ogg wermgr.exe File opened for modification C:\Program Files\StopExport.sql wermgr.exe File opened for modification C:\Program Files\SuspendCopy.wav wermgr.exe File created C:\Program Files (x86)\38f5e4dd38f5e33e712.lock wermgr.exe File created C:\Program Files\BSMASUNMGK-DECRYPT.txt wermgr.exe File created C:\Program Files\38f5e4dd38f5e33e712.lock wermgr.exe File opened for modification C:\Program Files\RestoreCompare.dotx wermgr.exe File opened for modification C:\Program Files\SaveSelect.dib wermgr.exe File opened for modification C:\Program Files\StopConfirm.dot wermgr.exe File opened for modification C:\Program Files\WriteStop.vsdx wermgr.exe File opened for modification C:\Program Files\UnlockExit.asp wermgr.exe File created C:\Program Files (x86)\BSMASUNMGK-DECRYPT.txt wermgr.exe File opened for modification C:\Program Files\SaveSkip.mpv2 wermgr.exe File opened for modification C:\Program Files\UnlockStep.xhtml wermgr.exe File opened for modification C:\Program Files\WriteCopy.png wermgr.exe File opened for modification C:\Program Files\ClearTrace.mhtml wermgr.exe File opened for modification C:\Program Files\CompleteCopy.xsl wermgr.exe File opened for modification C:\Program Files\ConvertToFormat.vstm wermgr.exe File opened for modification C:\Program Files\ConvertToSkip.asx wermgr.exe File opened for modification C:\Program Files\NewSet.ADT wermgr.exe File opened for modification C:\Program Files\TestRevoke.mpg wermgr.exe File opened for modification C:\Program Files\AddRename.avi wermgr.exe File opened for modification C:\Program Files\ApproveSubmit.vssx wermgr.exe File opened for modification C:\Program Files\SetProtect.vssx wermgr.exe File opened for modification C:\Program Files\AssertUpdate.ppsm wermgr.exe File opened for modification C:\Program Files\DebugGroup.easmx wermgr.exe File opened for modification C:\Program Files\ShowEnter.mpeg wermgr.exe -
Checks processor information in registry 2 TTPs 3 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
wermgr.exedescription ioc process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 wermgr.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString wermgr.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier wermgr.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
Processes:
wermgr.exepid process 1560 wermgr.exe 1560 wermgr.exe 1560 wermgr.exe 1560 wermgr.exe -
Suspicious use of AdjustPrivilegeToken 45 IoCs
Processes:
wmic.exevssvc.exedescription pid process Token: SeIncreaseQuotaPrivilege 1952 wmic.exe Token: SeSecurityPrivilege 1952 wmic.exe Token: SeTakeOwnershipPrivilege 1952 wmic.exe Token: SeLoadDriverPrivilege 1952 wmic.exe Token: SeSystemProfilePrivilege 1952 wmic.exe Token: SeSystemtimePrivilege 1952 wmic.exe Token: SeProfSingleProcessPrivilege 1952 wmic.exe Token: SeIncBasePriorityPrivilege 1952 wmic.exe Token: SeCreatePagefilePrivilege 1952 wmic.exe Token: SeBackupPrivilege 1952 wmic.exe Token: SeRestorePrivilege 1952 wmic.exe Token: SeShutdownPrivilege 1952 wmic.exe Token: SeDebugPrivilege 1952 wmic.exe Token: SeSystemEnvironmentPrivilege 1952 wmic.exe Token: SeRemoteShutdownPrivilege 1952 wmic.exe Token: SeUndockPrivilege 1952 wmic.exe Token: SeManageVolumePrivilege 1952 wmic.exe Token: 33 1952 wmic.exe Token: 34 1952 wmic.exe Token: 35 1952 wmic.exe Token: 36 1952 wmic.exe Token: SeIncreaseQuotaPrivilege 1952 wmic.exe Token: SeSecurityPrivilege 1952 wmic.exe Token: SeTakeOwnershipPrivilege 1952 wmic.exe Token: SeLoadDriverPrivilege 1952 wmic.exe Token: SeSystemProfilePrivilege 1952 wmic.exe Token: SeSystemtimePrivilege 1952 wmic.exe Token: SeProfSingleProcessPrivilege 1952 wmic.exe Token: SeIncBasePriorityPrivilege 1952 wmic.exe Token: SeCreatePagefilePrivilege 1952 wmic.exe Token: SeBackupPrivilege 1952 wmic.exe Token: SeRestorePrivilege 1952 wmic.exe Token: SeShutdownPrivilege 1952 wmic.exe Token: SeDebugPrivilege 1952 wmic.exe Token: SeSystemEnvironmentPrivilege 1952 wmic.exe Token: SeRemoteShutdownPrivilege 1952 wmic.exe Token: SeUndockPrivilege 1952 wmic.exe Token: SeManageVolumePrivilege 1952 wmic.exe Token: 33 1952 wmic.exe Token: 34 1952 wmic.exe Token: 35 1952 wmic.exe Token: 36 1952 wmic.exe Token: SeBackupPrivilege 3088 vssvc.exe Token: SeRestorePrivilege 3088 vssvc.exe Token: SeAuditPrivilege 3088 vssvc.exe -
Suspicious use of WriteProcessMemory 8 IoCs
Processes:
new.exewermgr.exedescription pid process target process PID 3788 wrote to memory of 1560 3788 new.exe wermgr.exe PID 3788 wrote to memory of 1560 3788 new.exe wermgr.exe PID 3788 wrote to memory of 1560 3788 new.exe wermgr.exe PID 3788 wrote to memory of 1560 3788 new.exe wermgr.exe PID 3788 wrote to memory of 1560 3788 new.exe wermgr.exe PID 1560 wrote to memory of 1952 1560 wermgr.exe wmic.exe PID 1560 wrote to memory of 1952 1560 wermgr.exe wmic.exe PID 1560 wrote to memory of 1952 1560 wermgr.exe wmic.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\new.exe"C:\Users\Admin\AppData\Local\Temp\new.exe"1⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\wermgr.exe"C:\Windows\System32\wermgr.exe"2⤵
- Modifies extensions of user files
- Drops startup file
- Enumerates connected drives
- Sets desktop wallpaper using registry
- Drops file in Program Files directory
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\wbem\wmic.exe"C:\Windows\system32\wbem\wmic.exe" shadowcopy delete3⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken