gandcrab | aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a

General

Target

aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
Size

266KB
MD5

c42358e341018a6cc299f5416149a112
SHA1

4b7537f61d9a5c5ebb0e21176f8287761e1d430c
SHA256

aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a
SHA512

89c54b483697dfcf6328e383edad01cdae892c4a11d2eb2f5a972ceb6acdf380b66ac9c78723ab4eef49f0616515991ad1f95d14a6cb2e68fabdbf09ed09487f

Score

10^/10

gandcrab backdoor persistence ransomware

Malware Config

Signatures

GandCrab Payload 1 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2040-62-0x00000000003A0000-0x00000000003B7000-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 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\smidhilvawv = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\vzcndk.exe\""	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe

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:

aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe

description	ioc	process
File opened (read-only)	\??\U:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\V:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\A:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\B:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\E:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\H:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\L:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\S:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\W:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\M:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\N:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\T:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\X:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\K:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\P:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\Q:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\R:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\Y:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\Z:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\F:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\G:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\I:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\J:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
File opened (read-only)	\??\O:	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe

Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

992 2040 WerFault.exe aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe

pid	pid_target	process	target process
992	2040	WerFault.exe	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.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:

aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

Processes:

aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exeWerFault.exe

pid	process
2040	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
2040	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
992	WerFault.exe
992	WerFault.exe
992	WerFault.exe
992	WerFault.exe
992	WerFault.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

WerFault.exe

pid process

992 WerFault.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

WerFault.exe

description pid process

Token: SeDebugPrivilege 992 WerFault.exe

pid	process
992	WerFault.exe

description	pid	process
Token: SeDebugPrivilege	992	WerFault.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe

description	pid	process	target process
PID 2040 wrote to memory of 992	2040	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe	WerFault.exe
PID 2040 wrote to memory of 992	2040	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe	WerFault.exe
PID 2040 wrote to memory of 992	2040	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe	WerFault.exe
PID 2040 wrote to memory of 992	2040	aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe	WerFault.exe

C:\Users\Admin\AppData\Local\Temp\aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe
"C:\Users\Admin\AppData\Local\Temp\aa44cf4991260488f10f72cee92cd70b63fa85ab188e186be06c159b207d187a.exe"
1⤵
- Adds Run key to start application
- Enumerates connected drives
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2040

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2040 -s 756
2⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
PID:992

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

Peripheral Device Discovery

1

T1120

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

memory/992-63-0x0000000000000000-mapping.dmp

Download
memory/992-64-0x0000000000250000-0x00000000002B0000-memory.dmp

Filesize
384KB

Download
memory/2040-60-0x0000000076281000-0x0000000076283000-memory.dmp

Filesize
8KB

Download
memory/2040-61-0x0000000000400000-0x000000000055B000-memory.dmp

Filesize
1.4MB

Download
memory/2040-62-0x00000000003A0000-0x00000000003B7000-memory.dmp

Filesize
92KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads