gandcrab | ef4402d954e911db4043d16d8648c6956b651b1fb025b8e14f895d6a0100cab5

General

Target
2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
Size 145KB
Sample240109-hmb9eagham
SHA256 ef4402d954e911db4043d16d8648c6956b651b1fb025b8e14f895d6a0100cab5
MD5 fa45cf53b890ffb0ef95c3e54b5bcc61
SHA1 dddd1506682c97874cfb423da05a4a24780359b0
SHA512 f752578ffb7a7fc50f0a4ca7be493a7c470a0e5cb5b9410baf47380f73d8e83085ddb11396a3d7750fd5c237bab6e1e3996b824bce8b890da02ad0c93305944d
SSDEEP 3072:QYHVHd2NCMqqDL2/mr3IdE8we0Avu5r++ygLIaagvdCjRv9OtN:QyOqqDL64vdGREz
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

gandcrab backdoor persistence ransomware

Malware Config

Signatures

GandCrab payload 2 IoCs

resource	yara_rule
behavioral2/memory/2320-0-0x0000000000400000-0x0000000000428000-memory.dmp	family_gandcrab
behavioral2/memory/2320-4-0x0000000000400000-0x0000000000428000-memory.dmp	family_gandcrab

Gandcrab
Gandcrab is a Trojan horse that encrypts files on a computer.
ransomware backdoor gandcrab

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3803511929-1339359695-2191195476-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\yghiomeiblj = "C:\\Users\\Admin\\AppData\\Local\\Temp\\2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe"	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.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:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\H:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\I:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\T:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\V:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\G:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\K:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\M:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\S:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\Y:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\J:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\N:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\P:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\Q:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\R:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\U:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\W:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\X:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\A:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\E:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\L:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\O:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
File opened (read-only)	\??\Z:	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.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 opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2320	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
2320	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
2320	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
2320	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2320 wrote to memory of 2144	2320	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe	50
PID 2320 wrote to memory of 2144	2320	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe	50
PID 2320 wrote to memory of 2144	2320	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe	50
PID 2320 wrote to memory of 4076	2320	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe	100
PID 2320 wrote to memory of 4076	2320	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe	100
PID 2320 wrote to memory of 4076	2320	2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe	100

C:\Users\Admin\AppData\Local\Temp\2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe
"C:\Users\Admin\AppData\Local\Temp\2024-01-08_fa45cf53b890ffb0ef95c3e54b5bcc61_gandcrab.exe"
1⤵
- Adds Run key to start application
- Enumerates connected drives
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2320
- C:\Windows\SysWOW64\nslookup.exe
  nslookup nomoreransom.bit dns1.soprodns.ru
  2⤵
  PID:2144
- C:\Windows\SysWOW64\nslookup.exe
  nslookup emsisoft.bit dns1.soprodns.ru
  2⤵
  PID:4076
- C:\Windows\SysWOW64\nslookup.exe
  nslookup gandcrab.bit dns1.soprodns.ru
  2⤵
  PID:1592
- C:\Windows\SysWOW64\nslookup.exe
  nslookup nomoreransom.bit dns1.soprodns.ru
  2⤵
  PID:4616
- C:\Windows\SysWOW64\nslookup.exe
  nslookup emsisoft.bit dns1.soprodns.ru
  2⤵
  PID:4488
- C:\Windows\SysWOW64\nslookup.exe
  nslookup gandcrab.bit dns1.soprodns.ru
  2⤵
  PID:5028
- C:\Windows\SysWOW64\nslookup.exe
  nslookup nomoreransom.bit dns1.soprodns.ru
  2⤵
  PID:668
- C:\Windows\SysWOW64\nslookup.exe
  nslookup emsisoft.bit dns1.soprodns.ru
  2⤵
  PID:3800
- C:\Windows\SysWOW64\nslookup.exe
  nslookup gandcrab.bit dns1.soprodns.ru
  2⤵
  PID:1012
- C:\Windows\SysWOW64\nslookup.exe
  nslookup nomoreransom.bit dns1.soprodns.ru
  2⤵
  PID:832
- C:\Windows\SysWOW64\nslookup.exe
  nslookup emsisoft.bit dns1.soprodns.ru
  2⤵
  PID:1676
- C:\Windows\SysWOW64\nslookup.exe
  nslookup gandcrab.bit dns1.soprodns.ru
  2⤵
  PID:4040