gandcrab | 2eaccf2ffad0c83282b940b5ed1e65f38acacc9e002b48e3bf4f852e1097232a

Resubmissions

05/02/2025, 08:55

250205-kvkxmayrcz10

05/02/2025, 06:37

250205-hdsvsswldm10

17/03/2024, 04:49

240317-ffz1saef6510

Analysis

max time kernel
148s
max time network
163s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
17/03/2024, 04:49

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General

Target
ransomwares/GandCrab/GandCrab.exe
Size 424KB
Sample240317-ffz1saef65
SHA256 49b769536224f160b6087dc866edf6445531c6136ab76b9d5079ce622b043200
MD5 95557a29de4b70a25ce62a03472be684
SHA1 5baabf2869278e60d4c4f236b832bffddd6cf969
SHA512 79b78cf77926e0d8b424ad9984f72d4461c7d9e7af58c4e2af32fa7c58cc445c534228b0709b87f5e35e1c8793b3d028dc60787151d852b8524023d08b57f103
SSDEEP 6144:/UGV83D35bJrqV2L/E0tA+j16kUef5Nj1mB9WjEw0tzMV:qvmVe9h1qEtkBzw0tQ
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

gandcrab backdoor ransomware

Malware Config

Extracted

Path

F:\$RECYCLE.BIN\ZVXSMBAAIR-DECRYPT.txt

Ransom Note

---= GANDCRAB V5.0.3 =--- ***********************UNDER NO CIRCUMSTANCES DO NOT DELETE THIS FILE, UNTIL ALL YOUR DATA IS RECOVERED*********************** *****FAILING TO DO SO, WILL RESULT IN YOUR SYSTEM CORRUPTION, IF THERE WILL BE DECRYPTION ERRORS***** Attention! All your files, documents, photos, databases and other important files are encrypted and have the extension: .ZVXSMBAAIR The only method of recovering files is to purchase an unique private key. Only we can give you this key and only we can recover your files. The server with your key is in a closed network TOR. You can get there by the following ways: ---------------------------------------------------------------------------------------- | 0. Download Tor browser - https://www.torproject.org/ | 1. Install Tor browser | 2. Open Tor Browser | 3. Open link in TOR browser: http://gandcrabmfe6mnef.onion/599df0f1a8c0e3e | 4. Follow the instructions on this page ---------------------------------------------------------------------------------------- On our page you will see instructions on payment and get the opportunity to decrypt 1 file for free. ATTENTION! IN ORDER TO PREVENT DATA DAMAGE: * DO NOT MODIFY ENCRYPTED FILES * DO NOT CHANGE DATA BELOW ---BEGIN GANDCRAB KEY--- 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 ---END GANDCRAB KEY--- ---BEGIN PC DATA--- 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 ---END PC DATA---

URLs

http://gandcrabmfe6mnef.onion/599df0f1a8c0e3e

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
T1070.004

Inhibit System Recovery
T1490
Renames multiple (240) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\ZVXSMBAAIR-DECRYPT.txt	wermgr.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\1a8c09d31a8c0e3b719.lock	wermgr.exe

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

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

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-513485977-2495024337-1260977654-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\\\pidor.bmp"	wermgr.exe

Drops file in Program Files directory 23 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\SendShow.rar	wermgr.exe
File opened for modification	C:\Program Files\ConfirmRequest.vstm	wermgr.exe
File opened for modification	C:\Program Files\FormatApprove.mpe	wermgr.exe
File opened for modification	C:\Program Files\PopAssert.docm	wermgr.exe
File opened for modification	C:\Program Files\ProtectWrite.potx	wermgr.exe
File opened for modification	C:\Program Files\ResizeSet.rar	wermgr.exe
File opened for modification	C:\Program Files\RequestPublish.ppt	wermgr.exe
File opened for modification	C:\Program Files\RestoreBlock.M2T	wermgr.exe
File opened for modification	C:\Program Files\RevokeUninstall.mpg	wermgr.exe
File created	C:\Program Files\ZVXSMBAAIR-DECRYPT.txt	wermgr.exe
File opened for modification	C:\Program Files\DismountBlock.avi	wermgr.exe
File opened for modification	C:\Program Files\EditLimit.ADT	wermgr.exe
File opened for modification	C:\Program Files\JoinSuspend.cfg	wermgr.exe
File opened for modification	C:\Program Files\MoveCheckpoint.mpv2	wermgr.exe
File opened for modification	C:\Program Files\SaveStep.au	wermgr.exe
File created	C:\Program Files\1a8c09d31a8c0e3b719.lock	wermgr.exe
File opened for modification	C:\Program Files\BackupTest.emf	wermgr.exe
File opened for modification	C:\Program Files\UnlockDisable.css	wermgr.exe
File created	C:\Program Files (x86)\1a8c09d31a8c0e3b719.lock	wermgr.exe
File opened for modification	C:\Program Files\CompareJoin.mhtml	wermgr.exe
File opened for modification	C:\Program Files\CompletePush.xps	wermgr.exe
File opened for modification	C:\Program Files\WatchConvert.aiff	wermgr.exe
File created	C:\Program Files (x86)\ZVXSMBAAIR-DECRYPT.txt	wermgr.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

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

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3920	wermgr.exe
3920	wermgr.exe
3920	wermgr.exe
3920	wermgr.exe

Suspicious use of AdjustPrivilegeToken 45 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	4388	wmic.exe
Token: SeSecurityPrivilege	4388	wmic.exe
Token: SeTakeOwnershipPrivilege	4388	wmic.exe
Token: SeLoadDriverPrivilege	4388	wmic.exe
Token: SeSystemProfilePrivilege	4388	wmic.exe
Token: SeSystemtimePrivilege	4388	wmic.exe
Token: SeProfSingleProcessPrivilege	4388	wmic.exe
Token: SeIncBasePriorityPrivilege	4388	wmic.exe
Token: SeCreatePagefilePrivilege	4388	wmic.exe
Token: SeBackupPrivilege	4388	wmic.exe
Token: SeRestorePrivilege	4388	wmic.exe
Token: SeShutdownPrivilege	4388	wmic.exe
Token: SeDebugPrivilege	4388	wmic.exe
Token: SeSystemEnvironmentPrivilege	4388	wmic.exe
Token: SeRemoteShutdownPrivilege	4388	wmic.exe
Token: SeUndockPrivilege	4388	wmic.exe
Token: SeManageVolumePrivilege	4388	wmic.exe
Token: 33	4388	wmic.exe
Token: 34	4388	wmic.exe
Token: 35	4388	wmic.exe
Token: 36	4388	wmic.exe
Token: SeIncreaseQuotaPrivilege	4388	wmic.exe
Token: SeSecurityPrivilege	4388	wmic.exe
Token: SeTakeOwnershipPrivilege	4388	wmic.exe
Token: SeLoadDriverPrivilege	4388	wmic.exe
Token: SeSystemProfilePrivilege	4388	wmic.exe
Token: SeSystemtimePrivilege	4388	wmic.exe
Token: SeProfSingleProcessPrivilege	4388	wmic.exe
Token: SeIncBasePriorityPrivilege	4388	wmic.exe
Token: SeCreatePagefilePrivilege	4388	wmic.exe
Token: SeBackupPrivilege	4388	wmic.exe
Token: SeRestorePrivilege	4388	wmic.exe
Token: SeShutdownPrivilege	4388	wmic.exe
Token: SeDebugPrivilege	4388	wmic.exe
Token: SeSystemEnvironmentPrivilege	4388	wmic.exe
Token: SeRemoteShutdownPrivilege	4388	wmic.exe
Token: SeUndockPrivilege	4388	wmic.exe
Token: SeManageVolumePrivilege	4388	wmic.exe
Token: 33	4388	wmic.exe
Token: 34	4388	wmic.exe
Token: 35	4388	wmic.exe
Token: 36	4388	wmic.exe
Token: SeBackupPrivilege	4916	vssvc.exe
Token: SeRestorePrivilege	4916	vssvc.exe
Token: SeAuditPrivilege	4916	vssvc.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4920 wrote to memory of 3920	4920	GandCrab.exe	95
PID 4920 wrote to memory of 3920	4920	GandCrab.exe	95
PID 4920 wrote to memory of 3920	4920	GandCrab.exe	95
PID 4920 wrote to memory of 3920	4920	GandCrab.exe	95
PID 4920 wrote to memory of 3920	4920	GandCrab.exe	95
PID 3920 wrote to memory of 4388	3920	wermgr.exe	103
PID 3920 wrote to memory of 4388	3920	wermgr.exe	103
PID 3920 wrote to memory of 4388	3920	wermgr.exe	103

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\ransomwares\GandCrab\GandCrab.exe
"C:\Users\Admin\AppData\Local\Temp\ransomwares\GandCrab\GandCrab.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4920
- C:\Windows\SysWOW64\wermgr.exe
  "C:\Windows\System32\wermgr.exe"
  2⤵
  - 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:3920
- - C:\Windows\SysWOW64\wbem\wmic.exe
    "C:\Windows\system32\wbem\wmic.exe" shadowcopy delete
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:4388

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4916

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Indicator Removal

T1070

File Deletion

T1070.004

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

T1491

Inhibit System Recovery

T1490

Replay Monitor

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Downloads

ZVXSMBAAIR-DECRYPT.txt

Path F:\$RECYCLE.BIN\ZVXSMBAAIR-DECRYPT.txt
Size 8KB
SHA256 1e2daaee0b796a7f618fa9fd21b7c3b80d61ffb60ec3125422ffac1c3996b1c3
MD5 1bb954406287236dc63615630f96ccb5
SHA1 603f0bc138c94e74718e25739f7e23ee7639e34c
SHA512 e58348d31299ca90f70b609be3a123507522c205e5ef7947847a949edeea650662308df5e0df3d9381e1f6696fcf3b64a2dd505e8a5601db7ffe130d71de6cfd
SSDEEP 96:dbmLqvym0frLJ4jZqHepBqYCtkQFxhGwj1ohSLs8VlEkPCajwp9MqU0CoHEtjaHI:dbshfrlDeqYCpM6ng9U5/FjsbA
MD5 SHA1 SHA512 SSDEEP

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memory/3920-1-0x0000000000400000-0x0000000000428000-memory.dmp

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memory/3920-636-0x0000000000400000-0x0000000000428000-memory.dmp

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memory/3920-644-0x0000000000400000-0x0000000000428000-memory.dmp

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memory/4920-0-0x0000000000400000-0x000000000046A000-memory.dmp

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