remcos | aaacdc757d39cd544288dcc7d9fc635dfc4942ed360b63c7be0d79525697fe30

Analysis

max time kernel
151s
max time network
151s
platform
windows10_x64
resource
win10v20201028
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 3 IoCs

pid	Process
2180	remcos.exe
204	remcos.exe
740	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\	Shipping document PL and BL0070,pdf.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\""	Shipping document PL and BL0070,pdf.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 2 IoCs

description	pid	Process	procid_target
PID 2868 set thread context of 1320	2868	Shipping document PL and BL0070,pdf.exe	80
PID 2180 set thread context of 740	2180	remcos.exe	88

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
3096	schtasks.exe
196	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000_Classes\Local Settings	Shipping document PL and BL0070,pdf.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2180	remcos.exe
2180	remcos.exe
2180	remcos.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2180	remcos.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
740	remcos.exe

Suspicious use of WriteProcessMemory 38 IoCs

description	pid	Process	procid_target
PID 2868 wrote to memory of 3096	2868	Shipping document PL and BL0070,pdf.exe	78
PID 2868 wrote to memory of 3096	2868	Shipping document PL and BL0070,pdf.exe	78
PID 2868 wrote to memory of 3096	2868	Shipping document PL and BL0070,pdf.exe	78
PID 2868 wrote to memory of 1320	2868	Shipping document PL and BL0070,pdf.exe	80
PID 2868 wrote to memory of 1320	2868	Shipping document PL and BL0070,pdf.exe	80
PID 2868 wrote to memory of 1320	2868	Shipping document PL and BL0070,pdf.exe	80
PID 2868 wrote to memory of 1320	2868	Shipping document PL and BL0070,pdf.exe	80
PID 2868 wrote to memory of 1320	2868	Shipping document PL and BL0070,pdf.exe	80
PID 2868 wrote to memory of 1320	2868	Shipping document PL and BL0070,pdf.exe	80
PID 2868 wrote to memory of 1320	2868	Shipping document PL and BL0070,pdf.exe	80
PID 2868 wrote to memory of 1320	2868	Shipping document PL and BL0070,pdf.exe	80
PID 2868 wrote to memory of 1320	2868	Shipping document PL and BL0070,pdf.exe	80
PID 2868 wrote to memory of 1320	2868	Shipping document PL and BL0070,pdf.exe	80
PID 1320 wrote to memory of 4052	1320	Shipping document PL and BL0070,pdf.exe	81
PID 1320 wrote to memory of 4052	1320	Shipping document PL and BL0070,pdf.exe	81
PID 1320 wrote to memory of 4052	1320	Shipping document PL and BL0070,pdf.exe	81
PID 4052 wrote to memory of 1436	4052	WScript.exe	82
PID 4052 wrote to memory of 1436	4052	WScript.exe	82
PID 4052 wrote to memory of 1436	4052	WScript.exe	82
PID 1436 wrote to memory of 2180	1436	cmd.exe	84
PID 1436 wrote to memory of 2180	1436	cmd.exe	84
PID 1436 wrote to memory of 2180	1436	cmd.exe	84
PID 2180 wrote to memory of 196	2180	remcos.exe	85
PID 2180 wrote to memory of 196	2180	remcos.exe	85
PID 2180 wrote to memory of 196	2180	remcos.exe	85
PID 2180 wrote to memory of 204	2180	remcos.exe	87
PID 2180 wrote to memory of 204	2180	remcos.exe	87
PID 2180 wrote to memory of 204	2180	remcos.exe	87
PID 2180 wrote to memory of 740	2180	remcos.exe	88
PID 2180 wrote to memory of 740	2180	remcos.exe	88
PID 2180 wrote to memory of 740	2180	remcos.exe	88
PID 2180 wrote to memory of 740	2180	remcos.exe	88
PID 2180 wrote to memory of 740	2180	remcos.exe	88
PID 2180 wrote to memory of 740	2180	remcos.exe	88
PID 2180 wrote to memory of 740	2180	remcos.exe	88
PID 2180 wrote to memory of 740	2180	remcos.exe	88
PID 2180 wrote to memory of 740	2180	remcos.exe	88
PID 2180 wrote to memory of 740	2180	remcos.exe	88

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 use of WriteProcessMemory
PID:2868
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\gPYtdAS" /XML "C:\Users\Admin\AppData\Local\Temp\tmp1A01.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:3096
- 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
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:1320
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4052
  - - 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:1436
    - - 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:2180
      - C:\Windows\SysWOW64\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\gPYtdAS" /XML "C:\Users\Admin\AppData\Local\Temp\tmp2278.tmp"
        6⤵
        Creates scheduled task(s)
        
        PID:196
      - C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        
        "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
        6⤵
        Executes dropped EXE
        
        PID:204
      - 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:740

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

Replay Monitor

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Downloads

memory/740-45-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/1320-19-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/1320-17-0x0000000000400000-0x0000000000421000-memory.dmp

Download

memory/2180-26-0x0000000073820000-0x0000000073F0E000-memory.dmp

Download

memory/2868-10-0x0000000005380000-0x0000000005392000-memory.dmp

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memory/2868-12-0x0000000005930000-0x0000000005938000-memory.dmp

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memory/2868-14-0x0000000006240000-0x00000000062C1000-memory.dmp

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memory/2868-11-0x00000000060B0000-0x000000000614E000-memory.dmp

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memory/2868-2-0x0000000073820000-0x0000000073F0E000-memory.dmp

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memory/2868-9-0x0000000005650000-0x0000000005651000-memory.dmp

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memory/2868-8-0x0000000005340000-0x0000000005341000-memory.dmp

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memory/2868-7-0x0000000005450000-0x0000000005451000-memory.dmp

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memory/2868-6-0x0000000005950000-0x0000000005951000-memory.dmp

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memory/2868-5-0x00000000053B0000-0x00000000053B1000-memory.dmp

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memory/2868-3-0x0000000000A10000-0x0000000000A11000-memory.dmp

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