gandcrab | de2fb10156d4852276992216e053a0c57fccf1e79051010ebf8299a4e9e253fb

General

Target

sample.exe
Size

183KB
MD5

07fadb006486953439ce0092651fd7a6
SHA1

e42431d37561cc695de03b85e8e99c9e31321742
SHA256

d77378dcc42b912e514d3bd4466cdda050dda9b57799a6c97f70e8489dd8c8d0
SHA512

5b09a07371bb5350b22c78aa3e7e673ba61ce72a964e072749a4633e2c15f416c05953cc6e6f6c586df010aa7f2c9c0ab87a014e4f732e5fdb2d58778a1fb437
SSDEEP

3072:Ealy19emgKe0QuYS3UmWuDTEltI3S/7IarDrjCgrQp0M7W:EaqxxDwx/7IS40MS

Score

10^/10

gandcrab backdoor defense_evasion discovery execution impact ransomware spyware stealer

Malware Config

Signatures

Gandcrab
Gandcrab is a Trojan horse that encrypts files on a computer.
ransomware backdoor gandcrab
Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware defense_evasion impact execution

File Deletion
T1070.004

Inhibit System Recovery
T1490

Windows Management Instrumentation
T1047
Renames multiple (318) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware
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:

sample.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation sample.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	sample.exe

Drops startup file 2 IoCs

Processes:

sample.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\VWZYT-DECRYPT.html	sample.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\ee5e8404ee5e83e6114.lock	sample.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Enumerates connected drives 3 TTPs 23 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:

sample.exe

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

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

Processes:

sample.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\\\pidor.bmp"	sample.exe

Drops file in Program Files directory 25 IoCs

Processes:

sample.exe

description	ioc	process
File opened for modification	C:\Program Files\ConnectUndo.potx	sample.exe
File opened for modification	C:\Program Files\GroupSplit.midi	sample.exe
File opened for modification	C:\Program Files\InvokeInstall.aifc	sample.exe
File opened for modification	C:\Program Files\OpenLock.eps	sample.exe
File opened for modification	C:\Program Files\ReceiveSelect.mpe	sample.exe
File opened for modification	C:\Program Files\RequestBackup.mht	sample.exe
File created	C:\Program Files\VWZYT-DECRYPT.html	sample.exe
File opened for modification	C:\Program Files\CompleteSuspend.MTS	sample.exe
File opened for modification	C:\Program Files\SendComplete.dotm	sample.exe
File opened for modification	C:\Program Files\InstallDisable.vstx	sample.exe
File opened for modification	C:\Program Files\LimitStart.doc	sample.exe
File opened for modification	C:\Program Files\SearchExit.mp3	sample.exe
File opened for modification	C:\Program Files\UnpublishRevoke.DVR-MS	sample.exe
File created	C:\Program Files (x86)\ee5e8404ee5e83e6114.lock	sample.exe
File opened for modification	C:\Program Files\ExpandRevoke.wmv	sample.exe
File opened for modification	C:\Program Files\InitializeSplit.tiff	sample.exe
File opened for modification	C:\Program Files\StepRedo.xps	sample.exe
File created	C:\Program Files\ee5e8404ee5e83e6114.lock	sample.exe
File opened for modification	C:\Program Files\SelectBlock.vstx	sample.exe
File opened for modification	C:\Program Files\StartSend.search-ms	sample.exe
File opened for modification	C:\Program Files\SyncExport.rar	sample.exe
File opened for modification	C:\Program Files\UnprotectJoin.clr	sample.exe
File created	C:\Program Files (x86)\VWZYT-DECRYPT.html	sample.exe
File opened for modification	C:\Program Files\SearchUnprotect.gif	sample.exe
File opened for modification	C:\Program Files\SplitUninstall.m1v	sample.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

sample.exewmic.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sample.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wmic.exe

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:

sample.exe

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

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

sample.exe

pid process

4192 sample.exe
4192 sample.exe
4192 sample.exe
4192 sample.exe

pid	process
4192	sample.exe
4192	sample.exe
4192	sample.exe
4192	sample.exe

Suspicious use of AdjustPrivilegeToken 45 IoCs

Processes:

wmic.exevssvc.exe

description	pid	process
Token: SeIncreaseQuotaPrivilege	2972	wmic.exe
Token: SeSecurityPrivilege	2972	wmic.exe
Token: SeTakeOwnershipPrivilege	2972	wmic.exe
Token: SeLoadDriverPrivilege	2972	wmic.exe
Token: SeSystemProfilePrivilege	2972	wmic.exe
Token: SeSystemtimePrivilege	2972	wmic.exe
Token: SeProfSingleProcessPrivilege	2972	wmic.exe
Token: SeIncBasePriorityPrivilege	2972	wmic.exe
Token: SeCreatePagefilePrivilege	2972	wmic.exe
Token: SeBackupPrivilege	2972	wmic.exe
Token: SeRestorePrivilege	2972	wmic.exe
Token: SeShutdownPrivilege	2972	wmic.exe
Token: SeDebugPrivilege	2972	wmic.exe
Token: SeSystemEnvironmentPrivilege	2972	wmic.exe
Token: SeRemoteShutdownPrivilege	2972	wmic.exe
Token: SeUndockPrivilege	2972	wmic.exe
Token: SeManageVolumePrivilege	2972	wmic.exe
Token: 33	2972	wmic.exe
Token: 34	2972	wmic.exe
Token: 35	2972	wmic.exe
Token: 36	2972	wmic.exe
Token: SeIncreaseQuotaPrivilege	2972	wmic.exe
Token: SeSecurityPrivilege	2972	wmic.exe
Token: SeTakeOwnershipPrivilege	2972	wmic.exe
Token: SeLoadDriverPrivilege	2972	wmic.exe
Token: SeSystemProfilePrivilege	2972	wmic.exe
Token: SeSystemtimePrivilege	2972	wmic.exe
Token: SeProfSingleProcessPrivilege	2972	wmic.exe
Token: SeIncBasePriorityPrivilege	2972	wmic.exe
Token: SeCreatePagefilePrivilege	2972	wmic.exe
Token: SeBackupPrivilege	2972	wmic.exe
Token: SeRestorePrivilege	2972	wmic.exe
Token: SeShutdownPrivilege	2972	wmic.exe
Token: SeDebugPrivilege	2972	wmic.exe
Token: SeSystemEnvironmentPrivilege	2972	wmic.exe
Token: SeRemoteShutdownPrivilege	2972	wmic.exe
Token: SeUndockPrivilege	2972	wmic.exe
Token: SeManageVolumePrivilege	2972	wmic.exe
Token: 33	2972	wmic.exe
Token: 34	2972	wmic.exe
Token: 35	2972	wmic.exe
Token: 36	2972	wmic.exe
Token: SeBackupPrivilege	2376	vssvc.exe
Token: SeRestorePrivilege	2376	vssvc.exe
Token: SeAuditPrivilege	2376	vssvc.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

sample.exe

description	pid	process	target process
PID 4192 wrote to memory of 2972	4192	sample.exe	wmic.exe
PID 4192 wrote to memory of 2972	4192	sample.exe	wmic.exe
PID 4192 wrote to memory of 2972	4192	sample.exe	wmic.exe

Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\sample.exe
"C:\Users\Admin\AppData\Local\Temp\sample.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Enumerates connected drives
- Sets desktop wallpaper using registry
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4192

C:\Windows\SysWOW64\wbem\wmic.exe
"C:\Windows\system32\wbem\wmic.exe" shadowcopy delete
2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2972

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2376

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Windows Management Instrumentation

1

T1047

Persistence

Privilege Escalation

Defense Evasion

Indicator Removal

1

T1070

File Deletion

Modify Registry

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

4

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Defacement

1

T1491

Inhibit System Recovery

1

T1490

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Downloads

C:\$Recycle.Bin\VWZYT-DECRYPT.html

Filesize
64KB

MD5
bf07914221e2b090ccd0adc6428e94b9

SHA1
156cc124836d4b175abb4bfbaa945298fde7ab48

SHA256
5259d525b1c129e5fc3e0ab312b4373d863669da88c222218a32823f6085350a

SHA512
7b62bb929e02b569553ba8d3db5d6152e42af377e98cb2018e9a91f231bc3473418955d327e202f7e4b4e48534ade0bcd6de9ba4725cdc3b63a9b495bf8f3c79

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads