remcos | 6b19b6261188bd102c2139595fa66347ee5717906e85d9fa90fd20e4209a91b0

Analysis

max time kernel
150s
max time network
149s
platform
windows10_x64
resource
win10v20201028
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 3 IoCs

pid	Process
3292	remcos.exe
2352	remcos.exe
2084	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-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\	order 353673.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\""	order 353673.exe
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\	remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\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 3928 set thread context of 1392	3928	order 353673.exe	79
PID 3292 set thread context of 2084	3292	remcos.exe	85
PID 2084 set thread context of 904	2084	remcos.exe	86

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-1-5-21-1985363256-3005190890-1182679451-1000_Classes\Local Settings	order 353673.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3928	order 353673.exe
3928	order 353673.exe
3292	remcos.exe
3292	remcos.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2084	remcos.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3928	order 353673.exe
Token: SeDebugPrivilege	3292	remcos.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2084	remcos.exe

Suspicious use of WriteProcessMemory 47 IoCs

description	pid	Process	procid_target
PID 3928 wrote to memory of 1976	3928	order 353673.exe	78
PID 3928 wrote to memory of 1976	3928	order 353673.exe	78
PID 3928 wrote to memory of 1976	3928	order 353673.exe	78
PID 3928 wrote to memory of 1392	3928	order 353673.exe	79
PID 3928 wrote to memory of 1392	3928	order 353673.exe	79
PID 3928 wrote to memory of 1392	3928	order 353673.exe	79
PID 3928 wrote to memory of 1392	3928	order 353673.exe	79
PID 3928 wrote to memory of 1392	3928	order 353673.exe	79
PID 3928 wrote to memory of 1392	3928	order 353673.exe	79
PID 3928 wrote to memory of 1392	3928	order 353673.exe	79
PID 3928 wrote to memory of 1392	3928	order 353673.exe	79
PID 3928 wrote to memory of 1392	3928	order 353673.exe	79
PID 3928 wrote to memory of 1392	3928	order 353673.exe	79
PID 3928 wrote to memory of 1392	3928	order 353673.exe	79
PID 3928 wrote to memory of 1392	3928	order 353673.exe	79
PID 1392 wrote to memory of 3056	1392	order 353673.exe	80
PID 1392 wrote to memory of 3056	1392	order 353673.exe	80
PID 1392 wrote to memory of 3056	1392	order 353673.exe	80
PID 3056 wrote to memory of 2116	3056	WScript.exe	81
PID 3056 wrote to memory of 2116	3056	WScript.exe	81
PID 3056 wrote to memory of 2116	3056	WScript.exe	81
PID 2116 wrote to memory of 3292	2116	cmd.exe	83
PID 2116 wrote to memory of 3292	2116	cmd.exe	83
PID 2116 wrote to memory of 3292	2116	cmd.exe	83
PID 3292 wrote to memory of 2352	3292	remcos.exe	84
PID 3292 wrote to memory of 2352	3292	remcos.exe	84
PID 3292 wrote to memory of 2352	3292	remcos.exe	84
PID 3292 wrote to memory of 2084	3292	remcos.exe	85
PID 3292 wrote to memory of 2084	3292	remcos.exe	85
PID 3292 wrote to memory of 2084	3292	remcos.exe	85
PID 3292 wrote to memory of 2084	3292	remcos.exe	85
PID 3292 wrote to memory of 2084	3292	remcos.exe	85
PID 3292 wrote to memory of 2084	3292	remcos.exe	85
PID 3292 wrote to memory of 2084	3292	remcos.exe	85
PID 3292 wrote to memory of 2084	3292	remcos.exe	85
PID 3292 wrote to memory of 2084	3292	remcos.exe	85
PID 3292 wrote to memory of 2084	3292	remcos.exe	85
PID 3292 wrote to memory of 2084	3292	remcos.exe	85
PID 3292 wrote to memory of 2084	3292	remcos.exe	85
PID 2084 wrote to memory of 904	2084	remcos.exe	86
PID 2084 wrote to memory of 904	2084	remcos.exe	86
PID 2084 wrote to memory of 904	2084	remcos.exe	86
PID 2084 wrote to memory of 904	2084	remcos.exe	86
PID 2084 wrote to memory of 904	2084	remcos.exe	86
PID 2084 wrote to memory of 904	2084	remcos.exe	86
PID 2084 wrote to memory of 904	2084	remcos.exe	86
PID 2084 wrote to memory of 904	2084	remcos.exe	86

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:3928
- C:\Users\Admin\AppData\Local\Temp\order 353673.exe
  "{path}"
  2⤵
  PID:1976
- C:\Users\Admin\AppData\Local\Temp\order 353673.exe
  "{path}"
  2⤵
  - Adds Run key to start application
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:1392
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3056
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2116
    - - 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 behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:3292
      - C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        
        "{path}"
        6⤵
        Executes dropped EXE
        
        PID:2352
      - C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        
        "{path}"
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of SetThreadContext
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:2084
        
        C:\Windows\SysWOW64\svchost.exe
        
        C:\Windows\SysWOW64\svchost.exe
        7⤵
        
        PID:904

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/904-37-0x0000000000400000-0x0000000000518000-memory.dmp

Download

memory/1392-15-0x0000000000400000-0x0000000000478000-memory.dmp

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memory/1392-13-0x0000000000400000-0x0000000000478000-memory.dmp

Download

memory/2084-39-0x0000000000400000-0x0000000000478000-memory.dmp

Download

memory/3292-30-0x00000000052F0000-0x00000000052F1000-memory.dmp

Download

memory/3292-22-0x0000000073BA0000-0x000000007428E000-memory.dmp

Download

memory/3928-10-0x0000000006F00000-0x0000000006F01000-memory.dmp

Download

memory/3928-9-0x0000000006E50000-0x0000000006E52000-memory.dmp

Download

memory/3928-8-0x00000000049F0000-0x00000000049F1000-memory.dmp

Download

memory/3928-11-0x00000000071A0000-0x0000000007248000-memory.dmp

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memory/3928-7-0x0000000004A10000-0x0000000004A11000-memory.dmp

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memory/3928-2-0x0000000073BA0000-0x000000007428E000-memory.dmp

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memory/3928-6-0x0000000004A80000-0x0000000004A81000-memory.dmp

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memory/3928-5-0x0000000004F80000-0x0000000004F81000-memory.dmp

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memory/3928-3-0x00000000000A0000-0x00000000000A1000-memory.dmp

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memory/3928-12-0x000000000A860000-0x000000000A8DD000-memory.dmp

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