crimsonrat | 497b143d5cfcda0f409ffaf51c84bd9d8e2dfdbb22500dd17420f76b4b94c55d

General

Target

sonam karwati.exe
Size

459KB
MD5

1f4afc5843bb6156627d0aa7feb18e1f
SHA1

773121980b0c7b188156836b9ed341d673f8f4f6
SHA256

92717c8ecbf6524a9fefb57a346872292daa2132aeb492ccf725208474ad9179
SHA512

d0173b8f0bcc076c0d9fb1ae7d0e634f89a2bda56168be66e02c91fe3c084bb142ee70dcdb18fad81ed81fa550da05fe52dda36c5578287ecb9e3d4a50c409ad

Score

10^/10

Malware Config

Signatures

CrimsonRAT Main Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000500000001ab2b-117.dat	family_crimsonrat
behavioral2/files/0x000500000001ab2b-118.dat	family_crimsonrat

CrimsonRat
Crimson RAT is a malware linked to a Pakistani-linked threat actor.
rat crimsonrat

Executes dropped EXE 1 IoCs

pid	Process
3504	rwlbmarivs.exe

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

System Information Discovery
T1082

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	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	WINWORD.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	WINWORD.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	WINWORD.EXE

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-369956170-74428499-1628131376-1000_Classes\Local Settings	sonam karwati.exe

Suspicious behavior: AddClipboardFormatListener 2 IoCs

pid	Process
2232	WINWORD.EXE
2232	WINWORD.EXE

Suspicious use of SetWindowsHookEx 8 IoCs

pid	Process
2232	WINWORD.EXE
2232	WINWORD.EXE
2232	WINWORD.EXE
2232	WINWORD.EXE
2232	WINWORD.EXE
2232	WINWORD.EXE
2232	WINWORD.EXE
2232	WINWORD.EXE

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2740 wrote to memory of 3504	2740	sonam karwati.exe	69
PID 2740 wrote to memory of 3504	2740	sonam karwati.exe	69
PID 2740 wrote to memory of 2232	2740	sonam karwati.exe	70
PID 2740 wrote to memory of 2232	2740	sonam karwati.exe	70

C:\Users\Admin\AppData\Local\Temp\sonam karwati.exe
"C:\Users\Admin\AppData\Local\Temp\sonam karwati.exe"
1⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2740
- C:\ProgramData\Bhithoas\rwlbmarivs.exe
  "C:\ProgramData\Bhithoas\rwlbmarivs.exe"
  2⤵
  - Executes dropped EXE
  PID:3504
- C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE
  "C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE" /n "C:\Users\Admin\Documents\sonam karwati_02 .docx" /o ""
  2⤵
  - Checks processor information in registry
  - Enumerates system info in registry
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious use of SetWindowsHookEx
  PID:2232

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/2232-124-0x00007FFE79D20000-0x00007FFE79D30000-memory.dmp

Filesize
64KB

Download
memory/2232-128-0x00007FFE76C00000-0x00007FFE76C10000-memory.dmp

Filesize
64KB

Download
memory/2232-121-0x00007FFE79D20000-0x00007FFE79D30000-memory.dmp

Filesize
64KB

Download
memory/2232-122-0x00007FFE79D20000-0x00007FFE79D30000-memory.dmp

Filesize
64KB

Download
memory/2232-123-0x00007FFE79D20000-0x00007FFE79D30000-memory.dmp

Filesize
64KB

Download
memory/2232-381-0x00007FFE79D20000-0x00007FFE79D30000-memory.dmp

Filesize
64KB

Download
memory/2232-125-0x00007FFE79D20000-0x00007FFE79D30000-memory.dmp

Filesize
64KB

Download
memory/2232-379-0x00007FFE79D20000-0x00007FFE79D30000-memory.dmp

Filesize
64KB

Download
memory/2232-129-0x00007FFE76C00000-0x00007FFE76C10000-memory.dmp

Filesize
64KB

Download
memory/2232-380-0x00007FFE79D20000-0x00007FFE79D30000-memory.dmp

Filesize
64KB

Download
memory/2232-378-0x00007FFE79D20000-0x00007FFE79D30000-memory.dmp

Filesize
64KB

Download
memory/2740-115-0x0000000000FF0000-0x0000000000FF2000-memory.dmp

Filesize
8KB

Download
memory/3504-119-0x000002267F4C0000-0x000002267FE68000-memory.dmp

Filesize
9.7MB

Download
memory/3504-120-0x000002261B1D0000-0x000002261B1D2000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads