gandcrab | ae865231cb46dd09afbd0213f6d29d158ae0c1752337ffab880183ea7fe96ed8

General

Target

o.exe
Size

183KB
MD5

07fadb006486953439ce0092651fd7a6
SHA1

e42431d37561cc695de03b85e8e99c9e31321742
SHA256

d77378dcc42b912e514d3bd4466cdda050dda9b57799a6c97f70e8489dd8c8d0
SHA512

5b09a07371bb5350b22c78aa3e7e673ba61ce72a964e072749a4633e2c15f416c05953cc6e6f6c586df010aa7f2c9c0ab87a014e4f732e5fdb2d58778a1fb437
SSDEEP

3072:Ealy19emgKe0QuYS3UmWuDTEltI3S/7IarDrjCgrQp0M7W:EaqxxDwx/7IS40MS

Score

10^/10

gandcrab backdoor ransomware spyware stealer

Malware Config

Signatures

Gandcrab
Gandcrab is a Trojan horse that encrypts files on a computer.
ransomware backdoor gandcrab
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Modifies extensions of user files 5 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

o.exe

description	ioc	process
File opened for modification	C:\Users\Admin\Pictures\AddNew.tiff	o.exe
File renamed	C:\Users\Admin\Pictures\AddNew.tiff => C:\Users\Admin\Pictures\AddNew.tiff.jcvph	o.exe
File renamed	C:\Users\Admin\Pictures\HideConnect.crw => C:\Users\Admin\Pictures\HideConnect.crw.jcvph	o.exe
File renamed	C:\Users\Admin\Pictures\MoveDismount.tif => C:\Users\Admin\Pictures\MoveDismount.tif.jcvph	o.exe
File renamed	C:\Users\Admin\Pictures\PublishEnable.raw => C:\Users\Admin\Pictures\PublishEnable.raw.jcvph	o.exe

Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

o.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation o.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	o.exe

Drops startup file 2 IoCs

Processes:

o.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\JCVPH-DECRYPT.html	o.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\77a858d477a85f3d30.lock	o.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Enumerates connected drives 3 TTPs 24 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

o.exe

description	ioc	process
File opened (read-only)	\??\I:	o.exe
File opened (read-only)	\??\O:	o.exe
File opened (read-only)	\??\S:	o.exe
File opened (read-only)	\??\V:	o.exe
File opened (read-only)	\??\Y:	o.exe
File opened (read-only)	\??\A:	o.exe
File opened (read-only)	\??\B:	o.exe
File opened (read-only)	\??\H:	o.exe
File opened (read-only)	\??\K:	o.exe
File opened (read-only)	\??\P:	o.exe
File opened (read-only)	\??\R:	o.exe
File opened (read-only)	\??\T:	o.exe
File opened (read-only)	\??\W:	o.exe
File opened (read-only)	\??\F:	o.exe
File opened (read-only)	\??\G:	o.exe
File opened (read-only)	\??\Q:	o.exe
File opened (read-only)	\??\U:	o.exe
File opened (read-only)	\??\X:	o.exe
File opened (read-only)	\??\Z:	o.exe
File opened (read-only)	\??\E:	o.exe
File opened (read-only)	\??\J:	o.exe
File opened (read-only)	\??\N:	o.exe
File opened (read-only)	\??\L:	o.exe
File opened (read-only)	\??\M:	o.exe

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

Processes:

o.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\\\pidor.bmp"	o.exe

Drops file in Program Files directory 16 IoCs

Processes:

o.exe

description	ioc	process
File created	C:\Program Files\77a858d477a85f3d30.lock	o.exe
File opened for modification	C:\Program Files\MoveRepair.jtx	o.exe
File opened for modification	C:\Program Files\RestoreResume.mpp	o.exe
File opened for modification	C:\Program Files\SendDisconnect.MTS	o.exe
File opened for modification	C:\Program Files\UseResolve.midi	o.exe
File created	C:\Program Files (x86)\77a858d477a85f3d30.lock	o.exe
File created	C:\Program Files\JCVPH-DECRYPT.html	o.exe
File opened for modification	C:\Program Files\ImportInvoke.odp	o.exe
File opened for modification	C:\Program Files\ShowAssert.tmp	o.exe
File opened for modification	C:\Program Files\UnpublishClose.easmx	o.exe
File opened for modification	C:\Program Files\UnregisterPublish.dib	o.exe
File created	C:\Program Files (x86)\JCVPH-DECRYPT.html	o.exe
File opened for modification	C:\Program Files\OutConvert.ppsx	o.exe
File opened for modification	C:\Program Files\TestUnpublish.ini	o.exe
File opened for modification	C:\Program Files\UndoWrite.xlsb	o.exe
File opened for modification	C:\Program Files\RedoRestart.vstm	o.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

o.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	o.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	o.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	o.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

o.exe

pid process

2412 o.exe
2412 o.exe
2412 o.exe
2412 o.exe

pid	process
2412	o.exe
2412	o.exe
2412	o.exe
2412	o.exe

Suspicious use of AdjustPrivilegeToken 45 IoCs

Processes:

wmic.exevssvc.exe

description	pid	process
Token: SeIncreaseQuotaPrivilege	3324	wmic.exe
Token: SeSecurityPrivilege	3324	wmic.exe
Token: SeTakeOwnershipPrivilege	3324	wmic.exe
Token: SeLoadDriverPrivilege	3324	wmic.exe
Token: SeSystemProfilePrivilege	3324	wmic.exe
Token: SeSystemtimePrivilege	3324	wmic.exe
Token: SeProfSingleProcessPrivilege	3324	wmic.exe
Token: SeIncBasePriorityPrivilege	3324	wmic.exe
Token: SeCreatePagefilePrivilege	3324	wmic.exe
Token: SeBackupPrivilege	3324	wmic.exe
Token: SeRestorePrivilege	3324	wmic.exe
Token: SeShutdownPrivilege	3324	wmic.exe
Token: SeDebugPrivilege	3324	wmic.exe
Token: SeSystemEnvironmentPrivilege	3324	wmic.exe
Token: SeRemoteShutdownPrivilege	3324	wmic.exe
Token: SeUndockPrivilege	3324	wmic.exe
Token: SeManageVolumePrivilege	3324	wmic.exe
Token: 33	3324	wmic.exe
Token: 34	3324	wmic.exe
Token: 35	3324	wmic.exe
Token: 36	3324	wmic.exe
Token: SeIncreaseQuotaPrivilege	3324	wmic.exe
Token: SeSecurityPrivilege	3324	wmic.exe
Token: SeTakeOwnershipPrivilege	3324	wmic.exe
Token: SeLoadDriverPrivilege	3324	wmic.exe
Token: SeSystemProfilePrivilege	3324	wmic.exe
Token: SeSystemtimePrivilege	3324	wmic.exe
Token: SeProfSingleProcessPrivilege	3324	wmic.exe
Token: SeIncBasePriorityPrivilege	3324	wmic.exe
Token: SeCreatePagefilePrivilege	3324	wmic.exe
Token: SeBackupPrivilege	3324	wmic.exe
Token: SeRestorePrivilege	3324	wmic.exe
Token: SeShutdownPrivilege	3324	wmic.exe
Token: SeDebugPrivilege	3324	wmic.exe
Token: SeSystemEnvironmentPrivilege	3324	wmic.exe
Token: SeRemoteShutdownPrivilege	3324	wmic.exe
Token: SeUndockPrivilege	3324	wmic.exe
Token: SeManageVolumePrivilege	3324	wmic.exe
Token: 33	3324	wmic.exe
Token: 34	3324	wmic.exe
Token: 35	3324	wmic.exe
Token: 36	3324	wmic.exe
Token: SeBackupPrivilege	232	vssvc.exe
Token: SeRestorePrivilege	232	vssvc.exe
Token: SeAuditPrivilege	232	vssvc.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

o.exe

description	pid	process	target process
PID 2412 wrote to memory of 3324	2412	o.exe	wmic.exe
PID 2412 wrote to memory of 3324	2412	o.exe	wmic.exe
PID 2412 wrote to memory of 3324	2412	o.exe	wmic.exe

C:\Users\Admin\AppData\Local\Temp\o.exe
"C:\Users\Admin\AppData\Local\Temp\o.exe"
1⤵
- Modifies extensions of user files
- Checks computer location settings
- 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
PID:2412
- C:\Windows\SysWOW64\wbem\wmic.exe
  "C:\Windows\system32\wbem\wmic.exe" shadowcopy delete
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3324