remcos | aaacdc757d39cd544288dcc7d9fc635dfc4942ed360b63c7be0d79525697fe30

Analysis

max time kernel
150s
max time network
152s
platform
windows7_x64
resource
win7v20201028
submitted
21/12/2020, 07:37

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General

Target
Shipping document PL and BL0070,pdf.exe
Size 1.1MB
Sample201221-ff3ba3edf6
SHA256 aaacdc757d39cd544288dcc7d9fc635dfc4942ed360b63c7be0d79525697fe30
MD5 d74d705136266e2d0f4f0c55977c6f26
SHA1 f3fa45a63bf91f1c6f1c61ebc7222a6bcd9ada78
SHA512 e0edeb48c983e40d74673c122a07017b097d4b7c837b583bdeb70c2aa0016de4f94c0929550c150e074adc3727268c67d0bfa72895e9fe5624f2d2a9e3550b74
MD5 SHA1 SHA512

Score

10^/10

remcos persistence rat

Malware Config

Extracted

Family

remcos

graceman2021.ddns.net:1717

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
916	remcos.exe
1232	remcos.exe

Loads dropped DLL 1 IoCs

pid	Process
676	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\	Shipping document PL and BL0070,pdf.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\""	Shipping document PL and BL0070,pdf.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 2 IoCs

description	pid	Process	procid_target
PID 1080 set thread context of 396	1080	Shipping document PL and BL0070,pdf.exe	31
PID 916 set thread context of 1232	916	remcos.exe	38

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
1212	schtasks.exe
1696	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1080	Shipping document PL and BL0070,pdf.exe
916	remcos.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1080	Shipping document PL and BL0070,pdf.exe
Token: SeDebugPrivilege	916	remcos.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1232	remcos.exe

Suspicious use of WriteProcessMemory 42 IoCs

description	pid	Process	procid_target
PID 1080 wrote to memory of 1212	1080	Shipping document PL and BL0070,pdf.exe	29
PID 1080 wrote to memory of 1212	1080	Shipping document PL and BL0070,pdf.exe	29
PID 1080 wrote to memory of 1212	1080	Shipping document PL and BL0070,pdf.exe	29
PID 1080 wrote to memory of 1212	1080	Shipping document PL and BL0070,pdf.exe	29
PID 1080 wrote to memory of 396	1080	Shipping document PL and BL0070,pdf.exe	31
PID 1080 wrote to memory of 396	1080	Shipping document PL and BL0070,pdf.exe	31
PID 1080 wrote to memory of 396	1080	Shipping document PL and BL0070,pdf.exe	31
PID 1080 wrote to memory of 396	1080	Shipping document PL and BL0070,pdf.exe	31
PID 1080 wrote to memory of 396	1080	Shipping document PL and BL0070,pdf.exe	31
PID 1080 wrote to memory of 396	1080	Shipping document PL and BL0070,pdf.exe	31
PID 1080 wrote to memory of 396	1080	Shipping document PL and BL0070,pdf.exe	31
PID 1080 wrote to memory of 396	1080	Shipping document PL and BL0070,pdf.exe	31
PID 1080 wrote to memory of 396	1080	Shipping document PL and BL0070,pdf.exe	31
PID 1080 wrote to memory of 396	1080	Shipping document PL and BL0070,pdf.exe	31
PID 1080 wrote to memory of 396	1080	Shipping document PL and BL0070,pdf.exe	31
PID 396 wrote to memory of 1152	396	Shipping document PL and BL0070,pdf.exe	32
PID 396 wrote to memory of 1152	396	Shipping document PL and BL0070,pdf.exe	32
PID 396 wrote to memory of 1152	396	Shipping document PL and BL0070,pdf.exe	32
PID 396 wrote to memory of 1152	396	Shipping document PL and BL0070,pdf.exe	32
PID 1152 wrote to memory of 676	1152	WScript.exe	33
PID 1152 wrote to memory of 676	1152	WScript.exe	33
PID 1152 wrote to memory of 676	1152	WScript.exe	33
PID 1152 wrote to memory of 676	1152	WScript.exe	33
PID 676 wrote to memory of 916	676	cmd.exe	35
PID 676 wrote to memory of 916	676	cmd.exe	35
PID 676 wrote to memory of 916	676	cmd.exe	35
PID 676 wrote to memory of 916	676	cmd.exe	35
PID 916 wrote to memory of 1696	916	remcos.exe	36
PID 916 wrote to memory of 1696	916	remcos.exe	36
PID 916 wrote to memory of 1696	916	remcos.exe	36
PID 916 wrote to memory of 1696	916	remcos.exe	36
PID 916 wrote to memory of 1232	916	remcos.exe	38
PID 916 wrote to memory of 1232	916	remcos.exe	38
PID 916 wrote to memory of 1232	916	remcos.exe	38
PID 916 wrote to memory of 1232	916	remcos.exe	38
PID 916 wrote to memory of 1232	916	remcos.exe	38
PID 916 wrote to memory of 1232	916	remcos.exe	38
PID 916 wrote to memory of 1232	916	remcos.exe	38
PID 916 wrote to memory of 1232	916	remcos.exe	38
PID 916 wrote to memory of 1232	916	remcos.exe	38
PID 916 wrote to memory of 1232	916	remcos.exe	38
PID 916 wrote to memory of 1232	916	remcos.exe	38

C:\Users\Admin\AppData\Local\Temp\Shipping document PL and BL0070,pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Shipping document PL and BL0070,pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1080
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\gPYtdAS" /XML "C:\Users\Admin\AppData\Local\Temp\tmp18CE.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1212
- C:\Users\Admin\AppData\Local\Temp\Shipping document PL and BL0070,pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\Shipping document PL and BL0070,pdf.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:396
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1152
  - - 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:676
    - - 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:916
      - C:\Windows\SysWOW64\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\gPYtdAS" /XML "C:\Users\Admin\AppData\Local\Temp\tmp20D9.tmp"
        6⤵
        Creates scheduled task(s)
        
        PID:1696
      - C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        
        "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of SetWindowsHookEx
        
        PID:1232

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/396-12-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/396-14-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/916-23-0x0000000074C70000-0x000000007535E000-memory.dmp

Download

memory/916-24-0x00000000008C0000-0x00000000008C1000-memory.dmp

Download

memory/1080-2-0x0000000074CF0000-0x00000000753DE000-memory.dmp

Download

memory/1080-9-0x0000000005400000-0x0000000005481000-memory.dmp

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memory/1080-7-0x00000000005F0000-0x00000000005F8000-memory.dmp

Download

memory/1080-6-0x00000000050E0000-0x000000000517E000-memory.dmp

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memory/1080-5-0x0000000000830000-0x0000000000842000-memory.dmp

Download

memory/1080-3-0x0000000000980000-0x0000000000981000-memory.dmp

Download

memory/1152-18-0x0000000002780000-0x0000000002784000-memory.dmp

Download

memory/1232-36-0x0000000000400000-0x0000000000421000-memory.dmp

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