remcos | 02650bdf290724edd38abc7e303ff74ca1fc7fba26f3f0dcead22cdce5b9b3fa

General

Target
9f7ef650ee32895e313edc085fbc29f9.exe
Size 455KB
Sample210505-1mpnk5vb46
SHA256 02650bdf290724edd38abc7e303ff74ca1fc7fba26f3f0dcead22cdce5b9b3fa
MD5 9f7ef650ee32895e313edc085fbc29f9
SHA1 bcde3f8d90c9b0d3ad79785f77a089003260fedc
SHA512 c79c2c31aeb6c22ede5cdfbf1c7b5428be304327b0f9ccd000f094ccbb9ec0a871bb5f5217ec7e98ea05917f6ae927a1082dd80adcc9bd0a35c26daac8de0e50
MD5 SHA1 SHA512

Score

10^/10

remcos persistence rat

Malware Config

Extracted

Family

remcos

C2

fieldsdegreenf.duckdns.org:6553
aaeeerbbbeee.duckdns.org:6553

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Executes dropped EXE 1 IoCs

pid	Process
1324	remcos.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\	9f7ef650ee32895e313edc085fbc29f9.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\""	9f7ef650ee32895e313edc085fbc29f9.exe
Key created	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\	remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\""	remcos.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1324 set thread context of 3560	1324	remcos.exe	80

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000_Classes\Local Settings	9f7ef650ee32895e313edc085fbc29f9.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1324	remcos.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 4008 wrote to memory of 2772	4008	9f7ef650ee32895e313edc085fbc29f9.exe	76
PID 4008 wrote to memory of 2772	4008	9f7ef650ee32895e313edc085fbc29f9.exe	76
PID 4008 wrote to memory of 2772	4008	9f7ef650ee32895e313edc085fbc29f9.exe	76
PID 2772 wrote to memory of 748	2772	WScript.exe	77
PID 2772 wrote to memory of 748	2772	WScript.exe	77
PID 2772 wrote to memory of 748	2772	WScript.exe	77
PID 748 wrote to memory of 1324	748	cmd.exe	79
PID 748 wrote to memory of 1324	748	cmd.exe	79
PID 748 wrote to memory of 1324	748	cmd.exe	79
PID 1324 wrote to memory of 3560	1324	remcos.exe	80
PID 1324 wrote to memory of 3560	1324	remcos.exe	80
PID 1324 wrote to memory of 3560	1324	remcos.exe	80
PID 1324 wrote to memory of 3560	1324	remcos.exe	80
PID 1324 wrote to memory of 3560	1324	remcos.exe	80
PID 1324 wrote to memory of 3560	1324	remcos.exe	80
PID 1324 wrote to memory of 3560	1324	remcos.exe	80
PID 1324 wrote to memory of 3560	1324	remcos.exe	80
PID 1324 wrote to memory of 3560	1324	remcos.exe	80
PID 1324 wrote to memory of 3560	1324	remcos.exe	80
PID 1324 wrote to memory of 3560	1324	remcos.exe	80
PID 1324 wrote to memory of 3560	1324	remcos.exe	80

C:\Users\Admin\AppData\Local\Temp\9f7ef650ee32895e313edc085fbc29f9.exe
"C:\Users\Admin\AppData\Local\Temp\9f7ef650ee32895e313edc085fbc29f9.exe"
1⤵
- Adds Run key to start application
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4008
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2772
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:748
  - - C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
      C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:1324
    - - C:\Windows\SysWOW64\svchost.exe
        
        C:\Windows\SysWOW64\svchost.exe
        5⤵
        
        PID:3560

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

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/3560-120-0x0000000000400000-0x0000000000478000-memory.dmp

Download

memory/3560-124-0x0000000000400000-0x0000000000478000-memory.dmp