remcos | 4a3338704ad09413d9fd5b62cf4181d87a4707a018232f3f63af922125bb262c

General

Target

Backdoor.exe
Size

36KB
MD5

719462ce5560c1cb249dee9564a1f34c
SHA1

b5a9519184036cda5756518e64decfaad60a2441
SHA256

4a3338704ad09413d9fd5b62cf4181d87a4707a018232f3f63af922125bb262c
SHA512

d695e4d1c45f5a92e40770ae631363aa0dcbc21ba769e01d735047f44f5a8b26afad1176c86127dd01bb3ea6fda234b2e3fdc71a55d475a13ca9069f4eb33950
SSDEEP

768:hNnmZ/8vPlLUdhfJ8v6utFpVsOHjPgpG5Sh7D11nr1:fnwu4DejVdiG5q1r

Score

10^/10

remcos host discovery persistence rat

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

C2

74.215.232.65:2404

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\""	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
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

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
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	Backdoor.exe
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

Executes dropped EXE 1 IoCs

pid	Process
2724	remcos.exe

Loads dropped DLL 2 IoCs

pid	Process
2552	cmd.exe
2552	cmd.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-1-5-21-312935884-697965778-3955649944-1000\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
Set value (str)	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\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

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

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
1976	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1976	PING.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2724	remcos.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2580 wrote to memory of 2552	2580	Backdoor.exe	30
PID 2580 wrote to memory of 2552	2580	Backdoor.exe	30
PID 2580 wrote to memory of 2552	2580	Backdoor.exe	30
PID 2580 wrote to memory of 2552	2580	Backdoor.exe	30
PID 2580 wrote to memory of 2552	2580	Backdoor.exe	30
PID 2580 wrote to memory of 2552	2580	Backdoor.exe	30
PID 2580 wrote to memory of 2552	2580	Backdoor.exe	30
PID 2552 wrote to memory of 1976	2552	cmd.exe	32
PID 2552 wrote to memory of 1976	2552	cmd.exe	32
PID 2552 wrote to memory of 1976	2552	cmd.exe	32
PID 2552 wrote to memory of 1976	2552	cmd.exe	32
PID 2552 wrote to memory of 2724	2552	cmd.exe	33
PID 2552 wrote to memory of 2724	2552	cmd.exe	33
PID 2552 wrote to memory of 2724	2552	cmd.exe	33
PID 2552 wrote to memory of 2724	2552	cmd.exe	33

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
- Adds Run key to start application
- Modifies WinLogon
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2580
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2552
- - 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:1976
- - 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 use of SetWindowsHookEx
    PID:2724

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

Remote System Discovery

1

T1018

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
\Users\Admin\AppData\Roaming\remcos\remcos.exe

Filesize
36KB

MD5
719462ce5560c1cb249dee9564a1f34c

SHA1
b5a9519184036cda5756518e64decfaad60a2441

SHA256
4a3338704ad09413d9fd5b62cf4181d87a4707a018232f3f63af922125bb262c

SHA512
d695e4d1c45f5a92e40770ae631363aa0dcbc21ba769e01d735047f44f5a8b26afad1176c86127dd01bb3ea6fda234b2e3fdc71a55d475a13ca9069f4eb33950

Download Submit
memory/2552-15-0x0000000000140000-0x0000000000159000-memory.dmp

Filesize
100KB

Download
memory/2580-0-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2580-11-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2724-21-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2724-18-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2724-22-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2724-24-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2724-28-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2724-30-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2724-33-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2724-35-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2724-36-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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