remcos | 8741e2fc5b709526eaec1e791c56c7d2c65f312940b81e6027bd6ee2b181d940

General

Target

Trojan.Win32.Remcos.exe
Size

469KB
MD5

22ce3d0fc9f92829be87f978fc573680
SHA1

2a55144aed0886304b490fbcc623be46a8871065
SHA256

8741e2fc5b709526eaec1e791c56c7d2c65f312940b81e6027bd6ee2b181d940
SHA512

6bcd798e8db887dc0822ba196c2d9efb96fbe604f3728069d0bff04d5862c0d2ac2b4b2d810f310a2ec211e8244ce078b93d72debf427099dbce8f2420d88f4c
SSDEEP

12288:umnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSEn9:WiLJbpI7I2WhQqZ7E9

Score

10^/10

remcos com surrogate credential_access discovery persistence rat stealer

Malware Config

Extracted

Family

remcos

Botnet

COM Surrogate

C2

stay-daughters.gl.at.ply.gg:43206

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
COM Surrogate.exe
copy_folder
COM Surrogate
delete_file
false
hide_file
false
hide_keylog_file
true
install_flag
true
keylog_crypt
true
keylog_file
logs.dat
keylog_flag
false
keylog_folder
Windows
mouse_option
false
mutex
Rmc-C5SENV
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
COM Surrogate
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Executes dropped EXE 1 IoCs

pid	Process
2088	COM Surrogate.exe

Loads dropped DLL 2 IoCs

pid	Process
2104	cmd.exe
2104	cmd.exe

Adds Run key to start application 2 TTPs 6 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\COM Surrogate = "\"C:\\ProgramData\\COM Surrogate\\COM Surrogate.exe\""	COM Surrogate.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Windows\CurrentVersion\Run\COM Surrogate = "\"C:\\ProgramData\\COM Surrogate\\COM Surrogate.exe\""	iexplore.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\COM Surrogate = "\"C:\\ProgramData\\COM Surrogate\\COM Surrogate.exe\""	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Windows\CurrentVersion\Run\COM Surrogate = "\"C:\\ProgramData\\COM Surrogate\\COM Surrogate.exe\""	Trojan.Win32.Remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\COM Surrogate = "\"C:\\ProgramData\\COM Surrogate\\COM Surrogate.exe\""	Trojan.Win32.Remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Windows\CurrentVersion\Run\COM Surrogate = "\"C:\\ProgramData\\COM Surrogate\\COM Surrogate.exe\""	COM Surrogate.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2088 set thread context of 1032	2088	COM Surrogate.exe	34
PID 1032 set thread context of 2756	1032	iexplore.exe	35

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Trojan.Win32.Remcos.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	COM Surrogate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	iexplore.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
2088	COM Surrogate.exe
1032	iexplore.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1032	iexplore.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 2292 wrote to memory of 2204	2292	Trojan.Win32.Remcos.exe	30
PID 2292 wrote to memory of 2204	2292	Trojan.Win32.Remcos.exe	30
PID 2292 wrote to memory of 2204	2292	Trojan.Win32.Remcos.exe	30
PID 2292 wrote to memory of 2204	2292	Trojan.Win32.Remcos.exe	30
PID 2204 wrote to memory of 2104	2204	WScript.exe	31
PID 2204 wrote to memory of 2104	2204	WScript.exe	31
PID 2204 wrote to memory of 2104	2204	WScript.exe	31
PID 2204 wrote to memory of 2104	2204	WScript.exe	31
PID 2104 wrote to memory of 2088	2104	cmd.exe	33
PID 2104 wrote to memory of 2088	2104	cmd.exe	33
PID 2104 wrote to memory of 2088	2104	cmd.exe	33
PID 2104 wrote to memory of 2088	2104	cmd.exe	33
PID 2088 wrote to memory of 1032	2088	COM Surrogate.exe	34
PID 2088 wrote to memory of 1032	2088	COM Surrogate.exe	34
PID 2088 wrote to memory of 1032	2088	COM Surrogate.exe	34
PID 2088 wrote to memory of 1032	2088	COM Surrogate.exe	34
PID 2088 wrote to memory of 1032	2088	COM Surrogate.exe	34
PID 1032 wrote to memory of 2756	1032	iexplore.exe	35
PID 1032 wrote to memory of 2756	1032	iexplore.exe	35
PID 1032 wrote to memory of 2756	1032	iexplore.exe	35
PID 1032 wrote to memory of 2756	1032	iexplore.exe	35
PID 1032 wrote to memory of 2756	1032	iexplore.exe	35

C:\Users\Admin\AppData\Local\Temp\Trojan.Win32.Remcos.exe
"C:\Users\Admin\AppData\Local\Temp\Trojan.Win32.Remcos.exe"
1⤵
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2292
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2204
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\ProgramData\COM Surrogate\COM Surrogate.exe"
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2104
  - - C:\ProgramData\COM Surrogate\COM Surrogate.exe
      "C:\ProgramData\COM Surrogate\COM Surrogate.exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: MapViewOfSection
      Suspicious use of WriteProcessMemory
      PID:2088
    - - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe"
        5⤵
        Adds Run key to start application
        Suspicious use of SetThreadContext
        System Location Discovery: System Language Discovery
        Suspicious behavior: MapViewOfSection
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:1032
      - C:\Windows\SysWOW64\svchost.exe
        
        svchost.exe
        6⤵
        
        PID:2756

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\Windows\logs.dat

Filesize
530B

MD5
14ddca32f8cf253165c5dffbe60cadd0

SHA1
0638b0cd74545b3091b8d768ee74c491e1539a07

SHA256
a3cf31b38dff458f3f828fbe14dc548f25b71c5ab6911f388b5bcf22f6a75eae

SHA512
c5fb16609304cc243f57eb765a3632676f1c7837ba0832d747ef19de992520607d728a5729e6c935c58fb9b0236664b3618b83fdc43195a123dbe22d51a0aad0

Download Submit
C:\Users\Admin\AppData\Local\Temp\install.vbs

Filesize
414B

MD5
01ea74daf9b956185c45016b68449bb0

SHA1
9d1a18d2c9a9f5ee04dc864adcd92f05577e9392

SHA256
1b22904a4106604da03fd63fad1663a3562f928fbe6bfc90af4b8239142e83da

SHA512
35566d72fc5739044bcb0ff14741c25aa0892fb6de57831eca737eb6896cd9c1c0837133504cf8df415a8e66196c317b86123967507d39814d3faaf989f8da02

Download Submit
\ProgramData\COM Surrogate\COM Surrogate.exe

Filesize
469KB

MD5
22ce3d0fc9f92829be87f978fc573680

SHA1
2a55144aed0886304b490fbcc623be46a8871065

SHA256
8741e2fc5b709526eaec1e791c56c7d2c65f312940b81e6027bd6ee2b181d940

SHA512
6bcd798e8db887dc0822ba196c2d9efb96fbe604f3728069d0bff04d5862c0d2ac2b4b2d810f310a2ec211e8244ce078b93d72debf427099dbce8f2420d88f4c

Download Submit
memory/1032-29-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-49-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-15-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-16-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-11-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-19-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-62-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-23-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-10-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-9-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1032-30-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-35-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-36-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-42-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-43-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-48-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-12-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-54-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-56-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/1032-61-0x0000000000080000-0x00000000000FF000-memory.dmp

Filesize
508KB

Download
memory/2756-20-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads