gandcrab | 3b61757c276c9f823c8d49f5322338891335c6ea17649ba0b39e36237d5d399d

Analysis

max time kernel
438s
max time network
447s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
08-03-2024 20:38

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General

Target

malware-samples-master/Ransomware/Grandcrab/grandcab.exe
Size

484KB
MD5

97a449fed7d800a8a635592605ff8a67
SHA1

2f339d8b2edb7c07126d9a3c37effe14966817c5
SHA256

233437b647f9482a8a3ba51d0af69039bb58fb48609704a39db1f709a0e6aca6
SHA512

85b4b260b801c54927f7b985d5f9fb891e44e5f72f9dcf9656684f8872339480ded94b4f3ba44d71fa491b88243f99155e3ecc7b3005fb5fbe24b1d10f47e4c3
SSDEEP

12288:hEm67VkaivvtYku9hoVw7G/znXoABEg6s0u1Tw:dEivv+bGuuznXONq10

Score

10^/10

gandcrab backdoor ransomware

Malware Config

Signatures

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

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:

grandcab.exe

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

Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

1044 2524 WerFault.exe grandcab.exe
996 2524 WerFault.exe grandcab.exe

pid	pid_target	process	target process
1044	2524	WerFault.exe	grandcab.exe
996	2524	WerFault.exe	grandcab.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:

grandcab.exe

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

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

grandcab.exe

pid process

2524 grandcab.exe
2524 grandcab.exe
2524 grandcab.exe
2524 grandcab.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

svchost.exe

description pid process

Token: SeManageVolumePrivilege 3164 svchost.exe

pid	process
2524	grandcab.exe
2524	grandcab.exe
2524	grandcab.exe
2524	grandcab.exe

description	pid	process
Token: SeManageVolumePrivilege	3164	svchost.exe

C:\Users\Admin\AppData\Local\Temp\malware-samples-master\Ransomware\Grandcrab\grandcab.exe
"C:\Users\Admin\AppData\Local\Temp\malware-samples-master\Ransomware\Grandcrab\grandcab.exe"
1⤵
- Enumerates connected drives
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
PID:2524
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2524 -s 832
  2⤵
  - Program crash
  PID:1044
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2524 -s 900
  2⤵
  - Program crash
  PID:996

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 2524 -ip 2524
1⤵
PID:3516

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 2524 -ip 2524
1⤵
PID:2452

C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe
1⤵
PID:5032

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k UnistackSvcGroup
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3164

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2524-0-0x00000000006B0000-0x00000000006BC000-memory.dmp

Filesize
48KB

Download
memory/2524-1-0x00000000006C0000-0x00000000006C1000-memory.dmp

Filesize
4KB

Download
memory/2524-2-0x00000000006C0000-0x00000000006C1000-memory.dmp

Filesize
4KB

Download
memory/2524-3-0x00000000006C0000-0x00000000006C1000-memory.dmp

Filesize
4KB

Download
memory/2524-4-0x00000000006B0000-0x00000000006BC000-memory.dmp

Filesize
48KB

Download
memory/2524-5-0x00000000006C0000-0x00000000006C1000-memory.dmp

Filesize
4KB

Download
memory/2524-6-0x00000000006C0000-0x00000000006C1000-memory.dmp

Filesize
4KB

Download
memory/2524-7-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2524-10-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3164-11-0x000001BE17D40000-0x000001BE17D50000-memory.dmp

Filesize
64KB

Download
memory/3164-27-0x000001BE17E40000-0x000001BE17E50000-memory.dmp

Filesize
64KB

Download
memory/3164-43-0x000001BE20170000-0x000001BE20171000-memory.dmp

Filesize
4KB

Download
memory/3164-45-0x000001BE201A0000-0x000001BE201A1000-memory.dmp

Filesize
4KB

Download
memory/3164-46-0x000001BE201A0000-0x000001BE201A1000-memory.dmp

Filesize
4KB

Download
memory/3164-47-0x000001BE202B0000-0x000001BE202B1000-memory.dmp

Filesize
4KB

Download