crimsonrat | 6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0

General

Target

6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0.exe
Size

270KB
MD5

db12a808823a93d95a2eb9719e0e5122
SHA1

5e2dcbddfd28c41bc6da89c3bbf1a9ac20b1080b
SHA256

6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0
SHA512

9817834daf4021b2510950ec1db6f9f905d122e1453ea170e9b9ef3c79c3871afcecfa6fd0a7937815c84a187250beca6102ef4d81a77ddff931a527407c4262

Score

10^/10

Malware Config

Signatures

CrimsonRAT Main Payload 2 IoCs

resource	yara_rule
behavioral1/files/0x000900000001235e-58.dat	family_crimsonrat
behavioral1/files/0x000900000001235e-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
1624	valthasrvin.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\PROGRA~3\Gthrentl\valthasrvin.exe	6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0.exe
File opened for modification	C:\PROGRA~3\Gthrentl\valthasrvin.exe	6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0.exe

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

System Information Discovery
T1082

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Internet Explorer\Toolbar	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	WINWORD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	WINWORD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Internet Explorer\MenuExt	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	WINWORD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1180	WINWORD.EXE

Suspicious use of SetWindowsHookEx 6 IoCs

pid	Process
1180	WINWORD.EXE
1180	WINWORD.EXE
1180	WINWORD.EXE
1180	WINWORD.EXE
1180	WINWORD.EXE
1180	WINWORD.EXE

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1152 wrote to memory of 1624	1152	6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0.exe	27
PID 1152 wrote to memory of 1624	1152	6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0.exe	27
PID 1152 wrote to memory of 1624	1152	6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0.exe	27
PID 1152 wrote to memory of 1180	1152	6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0.exe	28
PID 1152 wrote to memory of 1180	1152	6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0.exe	28
PID 1152 wrote to memory of 1180	1152	6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0.exe	28
PID 1152 wrote to memory of 1180	1152	6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0.exe	28

C:\Users\Admin\AppData\Local\Temp\6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0.exe
"C:\Users\Admin\AppData\Local\Temp\6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0.exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:1152
- C:\ProgramData\Gthrentl\valthasrvin.exe
  "C:\ProgramData\Gthrentl\valthasrvin.exe"
  2⤵
  - Executes dropped EXE
  PID:1624
- C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
  "C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\Documents\6257ab26547f390bfd67d60766a708a95998452eb487d6d7208a52dc3e9840e0-02 .doc"
  2⤵
  - Modifies Internet Explorer settings
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious use of SetWindowsHookEx
  PID:1180

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1152-54-0x000007FEEF150000-0x000007FEF01E6000-memory.dmp

Filesize
16.6MB

Download
memory/1152-55-0x0000000000B10000-0x0000000000B12000-memory.dmp

Filesize
8KB

Download
memory/1152-56-0x0000000000B16000-0x0000000000B35000-memory.dmp

Filesize
124KB

Download
memory/1180-66-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1180-64-0x0000000073011000-0x0000000073014000-memory.dmp

Filesize
12KB

Download
memory/1180-65-0x0000000070A91000-0x0000000070A93000-memory.dmp

Filesize
8KB

Download
memory/1180-67-0x0000000076AC1000-0x0000000076AC3000-memory.dmp

Filesize
8KB

Download
memory/1180-68-0x0000000071A7D000-0x0000000071A88000-memory.dmp

Filesize
44KB

Download
memory/1624-61-0x0000000000A10000-0x0000000000A12000-memory.dmp

Filesize
8KB

Download
memory/1624-62-0x0000000000A16000-0x0000000000A35000-memory.dmp

Filesize
124KB

Download
memory/1624-60-0x000007FEEF150000-0x000007FEF01E6000-memory.dmp

Filesize
16.6MB

Download

Analysis

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