remcos | 6b19b6261188bd102c2139595fa66347ee5717906e85d9fa90fd20e4209a91b0

Analysis

max time kernel
150s
max time network
151s
platform
windows7_x64
resource
win7v20201028
submitted
10/03/2021, 07:01

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General

Target
order 353673.exe
Size 1.1MB
Sample210310-arrdwphpsj
SHA256 6b19b6261188bd102c2139595fa66347ee5717906e85d9fa90fd20e4209a91b0
MD5 f776932b4fee4d07cb4497ebc4aae056
SHA1 ad0209b5a2c75b4142a0c01e911c325b5a21875b
SHA512 63a4885d9ce10efa5a9c217bcb8fab9aa78ec8bc68eedca390606c0d2bd84a7460adfd8fcf6023117a01ff0313dead54f7e0adeca9922a82916857c8e1a2bf7a
MD5 SHA1 SHA512

Score

10^/10

remcos persistence rat

Malware Config

Extracted

Family

remcos

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 2 IoCs

pid	Process
336	remcos.exe
1628	remcos.exe

Loads dropped DLL 1 IoCs

pid	Process
1056	cmd.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-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\	order 353673.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\""	order 353673.exe
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\	remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\""	remcos.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1684 set thread context of 316	1684	order 353673.exe	30
PID 336 set thread context of 1628	336	remcos.exe	35
PID 1628 set thread context of 2028	1628	remcos.exe	36

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1684	order 353673.exe
1684	order 353673.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1684	order 353673.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1628	remcos.exe

Suspicious use of WriteProcessMemory 51 IoCs

description	pid	Process	procid_target
PID 1684 wrote to memory of 1648	1684	order 353673.exe	29
PID 1684 wrote to memory of 1648	1684	order 353673.exe	29
PID 1684 wrote to memory of 1648	1684	order 353673.exe	29
PID 1684 wrote to memory of 1648	1684	order 353673.exe	29
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 1684 wrote to memory of 316	1684	order 353673.exe	30
PID 316 wrote to memory of 1616	316	order 353673.exe	31
PID 316 wrote to memory of 1616	316	order 353673.exe	31
PID 316 wrote to memory of 1616	316	order 353673.exe	31
PID 316 wrote to memory of 1616	316	order 353673.exe	31
PID 1616 wrote to memory of 1056	1616	WScript.exe	32
PID 1616 wrote to memory of 1056	1616	WScript.exe	32
PID 1616 wrote to memory of 1056	1616	WScript.exe	32
PID 1616 wrote to memory of 1056	1616	WScript.exe	32
PID 1056 wrote to memory of 336	1056	cmd.exe	34
PID 1056 wrote to memory of 336	1056	cmd.exe	34
PID 1056 wrote to memory of 336	1056	cmd.exe	34
PID 1056 wrote to memory of 336	1056	cmd.exe	34
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 336 wrote to memory of 1628	336	remcos.exe	35
PID 1628 wrote to memory of 2028	1628	remcos.exe	36
PID 1628 wrote to memory of 2028	1628	remcos.exe	36
PID 1628 wrote to memory of 2028	1628	remcos.exe	36
PID 1628 wrote to memory of 2028	1628	remcos.exe	36
PID 1628 wrote to memory of 2028	1628	remcos.exe	36
PID 1628 wrote to memory of 2028	1628	remcos.exe	36
PID 1628 wrote to memory of 2028	1628	remcos.exe	36
PID 1628 wrote to memory of 2028	1628	remcos.exe	36
PID 1628 wrote to memory of 2028	1628	remcos.exe	36

C:\Users\Admin\AppData\Local\Temp\order 353673.exe
"C:\Users\Admin\AppData\Local\Temp\order 353673.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1684
- C:\Users\Admin\AppData\Local\Temp\order 353673.exe
  "{path}"
  2⤵
  PID:1648
- C:\Users\Admin\AppData\Local\Temp\order 353673.exe
  "{path}"
  2⤵
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:316
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1616
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
      4⤵
      Loads dropped DLL
      Suspicious use of WriteProcessMemory
      PID:1056
    - - C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        
        C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:336
      - C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        
        "{path}"
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of SetThreadContext
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:1628
        
        C:\Windows\SysWOW64\svchost.exe
        
        C:\Windows\SysWOW64\svchost.exe
        7⤵
        
        PID:2028

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/316-15-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/316-9-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/316-11-0x00000000756A1000-0x00000000756A3000-memory.dmp

Download

memory/336-22-0x0000000073950000-0x000000007403E000-memory.dmp

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memory/336-26-0x0000000000590000-0x0000000000591000-memory.dmp

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memory/336-23-0x00000000002A0000-0x00000000002A1000-memory.dmp

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memory/1616-17-0x0000000002740000-0x0000000002744000-memory.dmp

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memory/1628-33-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/1684-2-0x0000000074670000-0x0000000074D5E000-memory.dmp

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memory/1684-5-0x0000000004AD0000-0x0000000004AD1000-memory.dmp

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memory/1684-6-0x0000000000220000-0x0000000000222000-memory.dmp

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memory/1684-7-0x0000000005880000-0x0000000005928000-memory.dmp

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memory/1684-3-0x0000000000A40000-0x0000000000A41000-memory.dmp

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memory/1684-8-0x0000000001F60000-0x0000000001FDD000-memory.dmp

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memory/2028-34-0x0000000000400000-0x0000000000518000-memory.dmp

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