remcos | e639fcadaec03de9703201cd5ed26ee2bb56a698c49e662dd7b6edab6accbe69

General

Target

Backdoor.exe
Size

36KB
MD5

7adbf0695e6b3744e4f800c4d5ea9302
SHA1

c64d7721fae66e49c9e88a6e5effcc0ca9501d37
SHA256

e639fcadaec03de9703201cd5ed26ee2bb56a698c49e662dd7b6edab6accbe69
SHA512

719bd2eecccd929eac4faf3c121940548a8e732695e0bd890f97705cbb0d56b2f65553b822b20e48aaefa58d975ea1a6d70b5fffe65ae54595d14a8d00012c8b
SSDEEP

768:uNnmZ/8vPlLUdhfJ8v6utFpVsOHjPgpG5o7D11ar1:Anwu4DejVdiG5ysr

Score

10^/10

remcos host discovery persistence rat

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

C2

192.168.200.176:2404

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
remcos.exe
copy_folder
remcos
delete_file
false
hide_file
false
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_bzblukwtnxokphw
screenshot_crypt
false
screenshot_flag
true
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
remcos
take_screenshot_option
false
take_screenshot_time
5

Signatures

Modifies WinLogon for persistence 2 TTPs 4 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\\remcos\\remcos.exe\""	Backdoor.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Backdoor.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	remcos.exe

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

Adds policy Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Backdoor.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	remcos.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	Backdoor.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-1-5-21-523280732-2327480845-3730041215-1000\Control Panel\International\Geo\Nation	Backdoor.exe

Executes dropped EXE 1 IoCs

pid	Process
376	remcos.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-523280732-2327480845-3730041215-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-523280732-2327480845-3730041215-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Backdoor.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Backdoor.exe

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	Backdoor.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	remcos.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 4 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Backdoor.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
636	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
636	PING.EXE

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
376	remcos.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
376	remcos.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2900 wrote to memory of 2712	2900	Backdoor.exe	82
PID 2900 wrote to memory of 2712	2900	Backdoor.exe	82
PID 2900 wrote to memory of 2712	2900	Backdoor.exe	82
PID 2712 wrote to memory of 636	2712	cmd.exe	84
PID 2712 wrote to memory of 636	2712	cmd.exe	84
PID 2712 wrote to memory of 636	2712	cmd.exe	84
PID 2712 wrote to memory of 376	2712	cmd.exe	85
PID 2712 wrote to memory of 376	2712	cmd.exe	85
PID 2712 wrote to memory of 376	2712	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\Backdoor.exe
"C:\Users\Admin\AppData\Local\Temp\Backdoor.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:2900
- 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
  - Suspicious use of WriteProcessMemory
  PID:2712
- - 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:636
- - C:\Users\Admin\AppData\Roaming\remcos\remcos.exe
    "C:\Users\Admin\AppData\Roaming\remcos\remcos.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Adds policy Run key to start application
    - Executes dropped EXE
    - Adds Run key to start application
    - Modifies WinLogon
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    PID:376

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

Boot or Logon Autostart Execution

4

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

2

T1547.004

Defense Evasion

Modify Registry

4

T1112

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
99B

MD5
76c1687d97dfdbcea62ef1490bec5001

SHA1
5f4d1aeafa7d840cde67b76f97416dd68efd1bed

SHA256
79f04ea049979ffd2232c459fdd57fae97a5255aea9b4a2c7dce7ead856f37a4

SHA512
da250f0628632a644f159d818a82a8b9cca8224e46843bddbe0f6f9c32a2d04f7736a620af49ab6d77616317ca7d68285e60043965fe86c03d940835bd30a925

Download Submit
C:\Users\Admin\AppData\Roaming\remcos\remcos.exe

Filesize
36KB

MD5
7adbf0695e6b3744e4f800c4d5ea9302

SHA1
c64d7721fae66e49c9e88a6e5effcc0ca9501d37

SHA256
e639fcadaec03de9703201cd5ed26ee2bb56a698c49e662dd7b6edab6accbe69

SHA512
719bd2eecccd929eac4faf3c121940548a8e732695e0bd890f97705cbb0d56b2f65553b822b20e48aaefa58d975ea1a6d70b5fffe65ae54595d14a8d00012c8b

Download Submit
memory/376-25-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-32-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-12-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-13-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-15-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-16-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-20-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-22-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-52-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-28-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-29-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-51-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-35-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-36-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-38-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-42-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-45-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-47-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/376-49-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2900-5-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2900-0-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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