remcos | e45bc4ce4e4f84bedc7ec144517df1d16ea97b1803fa1b3cf21c581390b50bf8

Analysis

max time kernel
150s
max time network
148s
platform
windows10_x64
resource
win10v20201028
submitted
17/02/2021, 21:12

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General

Target

Quotation6547558,pdf.exe
Size

706KB
MD5

8dbeaa2200e3dd4d09247606d25bec31
SHA1

72265ac4686a37571cdd1f7a6961853de166dc00
SHA256

e45bc4ce4e4f84bedc7ec144517df1d16ea97b1803fa1b3cf21c581390b50bf8
SHA512

c73fbe6c7300ccb33e6b293ab6218d605e52e20651a3bf22f2c51b2326fe63bd7b4b0978dbd190d714c3d889eb2d9256c62722d2180eba1e082db531d30f3ef2

Score

10^/10

remcos persistence rat

Malware Config

Extracted

Family

remcos

favour2021.ddns.net:1990

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
1124	remcos.exe
3452	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
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
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\	Quotation6547558,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\""	Quotation6547558,pdf.exe
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\	remcos.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1048 set thread context of 2848	1048	Quotation6547558,pdf.exe	82
PID 1124 set thread context of 3452	1124	remcos.exe	89

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

System Information Discovery
T1082

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
3404	schtasks.exe
3184	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	Quotation6547558,pdf.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1048	Quotation6547558,pdf.exe
1048	Quotation6547558,pdf.exe
1048	Quotation6547558,pdf.exe
1124	remcos.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1048	Quotation6547558,pdf.exe
Token: SeDebugPrivilege	1124	remcos.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3452	remcos.exe

Suspicious use of WriteProcessMemory 38 IoCs

description	pid	Process	procid_target
PID 1048 wrote to memory of 3404	1048	Quotation6547558,pdf.exe	79
PID 1048 wrote to memory of 3404	1048	Quotation6547558,pdf.exe	79
PID 1048 wrote to memory of 3404	1048	Quotation6547558,pdf.exe	79
PID 1048 wrote to memory of 1372	1048	Quotation6547558,pdf.exe	81
PID 1048 wrote to memory of 1372	1048	Quotation6547558,pdf.exe	81
PID 1048 wrote to memory of 1372	1048	Quotation6547558,pdf.exe	81
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 1048 wrote to memory of 2848	1048	Quotation6547558,pdf.exe	82
PID 2848 wrote to memory of 2296	2848	Quotation6547558,pdf.exe	83
PID 2848 wrote to memory of 2296	2848	Quotation6547558,pdf.exe	83
PID 2848 wrote to memory of 2296	2848	Quotation6547558,pdf.exe	83
PID 2296 wrote to memory of 2096	2296	WScript.exe	84
PID 2296 wrote to memory of 2096	2296	WScript.exe	84
PID 2296 wrote to memory of 2096	2296	WScript.exe	84
PID 2096 wrote to memory of 1124	2096	cmd.exe	86
PID 2096 wrote to memory of 1124	2096	cmd.exe	86
PID 2096 wrote to memory of 1124	2096	cmd.exe	86
PID 1124 wrote to memory of 3184	1124	remcos.exe	87
PID 1124 wrote to memory of 3184	1124	remcos.exe	87
PID 1124 wrote to memory of 3184	1124	remcos.exe	87
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89
PID 1124 wrote to memory of 3452	1124	remcos.exe	89

C:\Users\Admin\AppData\Local\Temp\Quotation6547558,pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Quotation6547558,pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1048
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\rtzecNlXv" /XML "C:\Users\Admin\AppData\Local\Temp\tmp8EF2.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:3404
- C:\Users\Admin\AppData\Local\Temp\Quotation6547558,pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\Quotation6547558,pdf.exe"
  2⤵
  PID:1372
- C:\Users\Admin\AppData\Local\Temp\Quotation6547558,pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\Quotation6547558,pdf.exe"
  2⤵
  - Adds Run key to start application
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2848
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2296
  - - 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:2096
    - - 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:1124
      - C:\Windows\SysWOW64\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\rtzecNlXv" /XML "C:\Users\Admin\AppData\Local\Temp\tmp8F9A.tmp"
        6⤵
        Creates scheduled task(s)
        
        PID:3184
      - 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:3452

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1048-7-0x0000000004C00000-0x0000000004C01000-memory.dmp

Filesize
4KB

Download
memory/1048-10-0x0000000004DD0000-0x0000000004DD1000-memory.dmp

Filesize
4KB

Download
memory/1048-11-0x0000000004B30000-0x0000000004B33000-memory.dmp

Filesize
12KB

Download
memory/1048-12-0x00000000057C0000-0x0000000005815000-memory.dmp

Filesize
340KB

Download
memory/1048-9-0x0000000004CA0000-0x0000000004CA1000-memory.dmp

Filesize
4KB

Download
memory/1048-8-0x0000000004AE0000-0x0000000004AE1000-memory.dmp

Filesize
4KB

Download
memory/1048-6-0x0000000005060000-0x0000000005061000-memory.dmp

Filesize
4KB

Download
memory/1048-2-0x0000000073460000-0x0000000073B4E000-memory.dmp

Filesize
6.9MB

Download
memory/1048-5-0x0000000004A20000-0x0000000004A21000-memory.dmp

Filesize
4KB

Download
memory/1048-3-0x0000000000040000-0x0000000000041000-memory.dmp

Filesize
4KB

Download
memory/1124-24-0x0000000073460000-0x0000000073B4E000-memory.dmp

Filesize
6.9MB

Download
memory/1124-33-0x00000000055B0000-0x00000000055B1000-memory.dmp

Filesize
4KB

Download
memory/2848-17-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2848-15-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/3452-40-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download