remcos | e45bc4ce4e4f84bedc7ec144517df1d16ea97b1803fa1b3cf21c581390b50bf8

Analysis

max time kernel
150s
max time network
130s
platform
windows7_x64
resource
win7v20201028
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
1464	remcos.exe
1956	remcos.exe

Loads dropped DLL 1 IoCs

pid	Process
924	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\	Quotation6547558,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\""	Quotation6547558,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 1684 set thread context of 400	1684	Quotation6547558,pdf.exe	31
PID 1464 set thread context of 1956	1464	remcos.exe	38

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
1624	schtasks.exe
1932	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1684	Quotation6547558,pdf.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1684	Quotation6547558,pdf.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1956	remcos.exe

Suspicious use of WriteProcessMemory 42 IoCs

description	pid	Process	procid_target
PID 1684 wrote to memory of 1624	1684	Quotation6547558,pdf.exe	29
PID 1684 wrote to memory of 1624	1684	Quotation6547558,pdf.exe	29
PID 1684 wrote to memory of 1624	1684	Quotation6547558,pdf.exe	29
PID 1684 wrote to memory of 1624	1684	Quotation6547558,pdf.exe	29
PID 1684 wrote to memory of 400	1684	Quotation6547558,pdf.exe	31
PID 1684 wrote to memory of 400	1684	Quotation6547558,pdf.exe	31
PID 1684 wrote to memory of 400	1684	Quotation6547558,pdf.exe	31
PID 1684 wrote to memory of 400	1684	Quotation6547558,pdf.exe	31
PID 1684 wrote to memory of 400	1684	Quotation6547558,pdf.exe	31
PID 1684 wrote to memory of 400	1684	Quotation6547558,pdf.exe	31
PID 1684 wrote to memory of 400	1684	Quotation6547558,pdf.exe	31
PID 1684 wrote to memory of 400	1684	Quotation6547558,pdf.exe	31
PID 1684 wrote to memory of 400	1684	Quotation6547558,pdf.exe	31
PID 1684 wrote to memory of 400	1684	Quotation6547558,pdf.exe	31
PID 1684 wrote to memory of 400	1684	Quotation6547558,pdf.exe	31
PID 400 wrote to memory of 932	400	Quotation6547558,pdf.exe	32
PID 400 wrote to memory of 932	400	Quotation6547558,pdf.exe	32
PID 400 wrote to memory of 932	400	Quotation6547558,pdf.exe	32
PID 400 wrote to memory of 932	400	Quotation6547558,pdf.exe	32
PID 932 wrote to memory of 924	932	WScript.exe	33
PID 932 wrote to memory of 924	932	WScript.exe	33
PID 932 wrote to memory of 924	932	WScript.exe	33
PID 932 wrote to memory of 924	932	WScript.exe	33
PID 924 wrote to memory of 1464	924	cmd.exe	35
PID 924 wrote to memory of 1464	924	cmd.exe	35
PID 924 wrote to memory of 1464	924	cmd.exe	35
PID 924 wrote to memory of 1464	924	cmd.exe	35
PID 1464 wrote to memory of 1932	1464	remcos.exe	36
PID 1464 wrote to memory of 1932	1464	remcos.exe	36
PID 1464 wrote to memory of 1932	1464	remcos.exe	36
PID 1464 wrote to memory of 1932	1464	remcos.exe	36
PID 1464 wrote to memory of 1956	1464	remcos.exe	38
PID 1464 wrote to memory of 1956	1464	remcos.exe	38
PID 1464 wrote to memory of 1956	1464	remcos.exe	38
PID 1464 wrote to memory of 1956	1464	remcos.exe	38
PID 1464 wrote to memory of 1956	1464	remcos.exe	38
PID 1464 wrote to memory of 1956	1464	remcos.exe	38
PID 1464 wrote to memory of 1956	1464	remcos.exe	38
PID 1464 wrote to memory of 1956	1464	remcos.exe	38
PID 1464 wrote to memory of 1956	1464	remcos.exe	38
PID 1464 wrote to memory of 1956	1464	remcos.exe	38
PID 1464 wrote to memory of 1956	1464	remcos.exe	38

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:1684
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\rtzecNlXv" /XML "C:\Users\Admin\AppData\Local\Temp\tmp3F.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1624
- 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
  - Suspicious use of WriteProcessMemory
  PID:400
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:932
  - - 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:924
    - - 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:1464
      - C:\Windows\SysWOW64\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\rtzecNlXv" /XML "C:\Users\Admin\AppData\Local\Temp\tmpF2E7.tmp"
        6⤵
        Creates scheduled task(s)
        
        PID:1932
      - 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:1956

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/400-16-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/400-10-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/400-12-0x00000000756A1000-0x00000000756A3000-memory.dmp

Filesize
8KB

Download
memory/932-18-0x0000000002670000-0x0000000002674000-memory.dmp

Filesize
16KB

Download
memory/1464-23-0x0000000073950000-0x000000007403E000-memory.dmp

Filesize
6.9MB

Download
memory/1464-27-0x00000000007B0000-0x00000000007B1000-memory.dmp

Filesize
4KB

Download
memory/1464-24-0x0000000000850000-0x0000000000851000-memory.dmp

Filesize
4KB

Download
memory/1684-5-0x00000000005F0000-0x00000000005F3000-memory.dmp

Filesize
12KB

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

Filesize
6.9MB

Download
memory/1684-6-0x0000000004C80000-0x0000000004C81000-memory.dmp

Filesize
4KB

Download
memory/1684-3-0x0000000001280000-0x0000000001281000-memory.dmp

Filesize
4KB

Download
memory/1684-7-0x0000000004820000-0x0000000004875000-memory.dmp

Filesize
340KB

Download
memory/1956-35-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download