remcos | c0d4c3f39c9f144c79f5e12aee1eda7e7ae4c563c01effd7f2435fe5fbd8acc1

General

Target

COMSurrogate.exe
Size

92KB
MD5

f2a955b86d8b8ee7767e281d1f365f09
SHA1

19b4b0e948a0d5dbd802e95aa0715c95d7889d32
SHA256

c0d4c3f39c9f144c79f5e12aee1eda7e7ae4c563c01effd7f2435fe5fbd8acc1
SHA512

60f2a34b1a477e576d95307cad6488927da85bcef8d80b6deab3bd8ba8e0c142c8202a7b5a42f9d89da307fa8ba09dda65be2c5256c143cfbf695b69ad05d966
SSDEEP

1536:IhhW0YTGZWdVseJxaM9kraLdV2QkQ1TbPX8IHOCkIsI4ESHNTh9E+JP19qkP6trU:OhzYTGWVvJ8f2v1TbPzuMsIFSHNThy+N

Score

10^/10

remcos host defense_evasion discovery persistence rat trojan

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

C2

ddffg-52874.portmap.host:52874

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
COM Surrogate
copy_folder
AppDataX
delete_file
true
hide_file
true
hide_keylog_file
false
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
remcos_xouefyyxav
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
WindowsNotification
take_screenshot_option
false
take_screenshot_time
5

Signatures

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\AppDataX\\COM Surrogate\""	COMSurrogate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\AppDataX\\COM Surrogate\""	COMSurrogate.exe

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

UAC bypass 3 TTPs 1 IoCs

defense_evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	COMSurrogate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\WindowsNotification = "\"C:\\Users\\Admin\\AppData\\Roaming\\AppDataX\\COM Surrogate\""	COMSurrogate.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-308834014-1004923324-1191300197-1000\Control Panel\International\Geo\Nation	COMSurrogate.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-308834014-1004923324-1191300197-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WindowsNotification = "\"C:\\Users\\Admin\\AppData\\Roaming\\AppDataX\\COM Surrogate\""	COMSurrogate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\WindowsNotification = "\"C:\\Users\\Admin\\AppData\\Roaming\\AppDataX\\COM Surrogate\""	COMSurrogate.exe

Modifies WinLogon 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	COMSurrogate.exe

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	COMSurrogate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
1568	PING.EXE

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-308834014-1004923324-1191300197-1000_Classes\Local Settings	cmd.exe
Key created	\REGISTRY\USER\S-1-5-21-308834014-1004923324-1191300197-1000_Classes\Local Settings	OpenWith.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
3260	reg.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1568	PING.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4896	OpenWith.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 5032 wrote to memory of 2516	5032	COMSurrogate.exe	87
PID 5032 wrote to memory of 2516	5032	COMSurrogate.exe	87
PID 5032 wrote to memory of 2516	5032	COMSurrogate.exe	87
PID 2516 wrote to memory of 3260	2516	cmd.exe	93
PID 2516 wrote to memory of 3260	2516	cmd.exe	93
PID 2516 wrote to memory of 3260	2516	cmd.exe	93
PID 5032 wrote to memory of 940	5032	COMSurrogate.exe	94
PID 5032 wrote to memory of 940	5032	COMSurrogate.exe	94
PID 5032 wrote to memory of 940	5032	COMSurrogate.exe	94
PID 940 wrote to memory of 1568	940	cmd.exe	96
PID 940 wrote to memory of 1568	940	cmd.exe	96
PID 940 wrote to memory of 1568	940	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\COMSurrogate.exe
"C:\Users\Admin\AppData\Local\Temp\COMSurrogate.exe"
1⤵
- Modifies WinLogon for persistence
- Adds policy Run key to start application
- Checks computer location settings
- Adds Run key to start application
- Modifies WinLogon
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5032
- C:\Windows\SysWOW64\cmd.exe
  /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2516
- - C:\Windows\SysWOW64\reg.exe
    C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
    3⤵
    - UAC bypass
    - System Location Discovery: System Language Discovery
    - Modifies registry key
    PID:3260
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:940
- - C:\Windows\SysWOW64\PING.EXE
    PING 127.0.0.1 -n 2
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:1568

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Roaming\AppDataX\COM Surrogate"
1⤵
PID:464

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Roaming\AppDataX\COM Surrogate"
1⤵
PID:5416

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:4896

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

4

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

2

T1547.004

Privilege Escalation

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Boot or Logon Autostart Execution

4

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

2

T1547.004

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.bat

Filesize
162B

MD5
3c5270113fbbce652c4338d4168a25dc

SHA1
f67fba26866795206b71d1f8d089c88a1f9a04d8

SHA256
032609f56d7b8fe262bafe8d2222951f3aee876cd13141ada15ada8d5cb1f201

SHA512
8cce0e35cf03ae6a39f2809512a4059cb6e422f7fcd92f040ae97e45751780601be912aa9b8fa3127f2c1c5eb00a238000a029343218d9881fb0b83bcbbf8ee2

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C:\Users\Admin\AppData\Roaming\AppDataX\COM Surrogate

Filesize
92KB

MD5
f2a955b86d8b8ee7767e281d1f365f09

SHA1
19b4b0e948a0d5dbd802e95aa0715c95d7889d32

SHA256
c0d4c3f39c9f144c79f5e12aee1eda7e7ae4c563c01effd7f2435fe5fbd8acc1

SHA512
60f2a34b1a477e576d95307cad6488927da85bcef8d80b6deab3bd8ba8e0c142c8202a7b5a42f9d89da307fa8ba09dda65be2c5256c143cfbf695b69ad05d966

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads