crimsonrat | e3844f43afbc510d0b5c6f77e482711bbbb3dcae8e04b2f7200a11eff27c029d

Analysis

max time kernel
153s
max time network
161s
platform
windows7_x64
resource
win7-en-20211208
submitted
21/01/2022, 23:00

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General

Target

BHC-PR/British High Commission Rhinnon Mills.exe
Size

687KB
MD5

41120771530675f31125936f630d7a67
SHA1

9f55015e9bfbb65f0a5b2ad8deaea1df67660fec
SHA256

1bf6dc9af6dd730120f598d02f139f5a7776993afe29679f83a3d2fda3599736
SHA512

62c4c55cf8b9c987c064300210ce746242565d4e3b0ff0008cbcf5fac4668e4cc14d007caa697dcb3774fb1ec679646cb4bff3f012ef0e104870277fcd5f7e58

Score

10^/10

crimsonrat rat

Malware Config

Signatures

CrimsonRAT Main Payload 2 IoCs

resource	yara_rule
behavioral9/files/0x0006000000012608-60.dat	family_crimsonrat
behavioral9/files/0x0006000000012608-59.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
644	rnthiavesa.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\PROGRA~3\HANTHA~1\rnthiavesa.exe	British High Commission Rhinnon Mills.exe
File opened for modification	C:\PROGRA~3\HANTHA~1\rnthiavesa.exe	British High Commission Rhinnon Mills.exe

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

System Information Discovery
T1082

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
576	AcroRd32.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
576	AcroRd32.exe
576	AcroRd32.exe
576	AcroRd32.exe
576	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 964 wrote to memory of 576	964	British High Commission Rhinnon Mills.exe	27
PID 964 wrote to memory of 576	964	British High Commission Rhinnon Mills.exe	27
PID 964 wrote to memory of 576	964	British High Commission Rhinnon Mills.exe	27
PID 964 wrote to memory of 576	964	British High Commission Rhinnon Mills.exe	27
PID 964 wrote to memory of 644	964	British High Commission Rhinnon Mills.exe	28
PID 964 wrote to memory of 644	964	British High Commission Rhinnon Mills.exe	28
PID 964 wrote to memory of 644	964	British High Commission Rhinnon Mills.exe	28

C:\Users\Admin\AppData\Local\Temp\BHC-PR\British High Commission Rhinnon Mills.exe
"C:\Users\Admin\AppData\Local\Temp\BHC-PR\British High Commission Rhinnon Mills.exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:964
- C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe
  "C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe" "C:\Users\Admin\Documents\British High Commission Rhinnon Mills-03-.pdf"
  2⤵
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of SetWindowsHookEx
  PID:576
- C:\ProgramData\Hanthavra\rnthiavesa.exe
  "C:\ProgramData\Hanthavra\rnthiavesa.exe"
  2⤵
  - Executes dropped EXE
  PID:644

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/576-57-0x0000000075D61000-0x0000000075D63000-memory.dmp

Filesize
8KB

Download
memory/644-61-0x000007FEF1F20000-0x000007FEF2FB6000-memory.dmp

Filesize
16.6MB

Download
memory/644-63-0x0000000002886000-0x00000000028A5000-memory.dmp

Filesize
124KB

Download
memory/644-62-0x0000000002880000-0x0000000002882000-memory.dmp

Filesize
8KB

Download
memory/964-54-0x0000000000990000-0x0000000000992000-memory.dmp

Filesize
8KB

Download
memory/964-55-0x000007FEF1F20000-0x000007FEF2FB6000-memory.dmp

Filesize
16.6MB

Download
memory/964-56-0x0000000000996000-0x00000000009B5000-memory.dmp

Filesize
124KB

Download