remcos | d138d810c8b0d8770b31b62f87a2b51bdf33ac1920b41a80007ed718397e7390

General

Target

HOTFIX.exe
Size

92KB
MD5

49dea8978a30fad5001a5f689b7f15e1
SHA1

317c883761e60af918ab9748d7417d931963849f
SHA256

d138d810c8b0d8770b31b62f87a2b51bdf33ac1920b41a80007ed718397e7390
SHA512

dc3c29adbd1ad52bcba7fb0b24985798abc51c90984f3b556b448380c036407b92bf6f4275252c0e864b330aea00de6f0096945286f28be1a415fde20833c0dd
SSDEEP

1536:ohhW0YTGZWdVseJxaM9kraLdV2QkQ1TbPX8IHOCkIsI4ESHNTh9E+JP19qkP60rj:uhzYTGWVvJ8f2v1TbPzuMsIFSHNThy+3

Score

10^/10

remcos host persistence rat

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

C2

to-adam.gl.at.ply.gg:65290

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
true
hide_keylog_file
true
install_flag
true
install_path
%AppData%
keylog_crypt
true
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
remcos_icbwxxlmpc
screenshot_crypt
true
screenshot_flag
true
screenshot_folder
Screens
screenshot_path
%Temp%
screenshot_time
10
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\""	HOTFIX.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\""	HOTFIX.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
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	HOTFIX.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	HOTFIX.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
2628	remcos.exe

Loads dropped DLL 2 IoCs

pid	Process
2968	cmd.exe
2968	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-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	HOTFIX.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	HOTFIX.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\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\	HOTFIX.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

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2540	PING.EXE

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2628	remcos.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2628	remcos.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2628	remcos.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 2280 wrote to memory of 2968	2280	HOTFIX.exe	28
PID 2280 wrote to memory of 2968	2280	HOTFIX.exe	28
PID 2280 wrote to memory of 2968	2280	HOTFIX.exe	28
PID 2280 wrote to memory of 2968	2280	HOTFIX.exe	28
PID 2280 wrote to memory of 2968	2280	HOTFIX.exe	28
PID 2280 wrote to memory of 2968	2280	HOTFIX.exe	28
PID 2280 wrote to memory of 2968	2280	HOTFIX.exe	28
PID 2968 wrote to memory of 2540	2968	cmd.exe	30
PID 2968 wrote to memory of 2540	2968	cmd.exe	30
PID 2968 wrote to memory of 2540	2968	cmd.exe	30
PID 2968 wrote to memory of 2540	2968	cmd.exe	30
PID 2968 wrote to memory of 2628	2968	cmd.exe	31
PID 2968 wrote to memory of 2628	2968	cmd.exe	31
PID 2968 wrote to memory of 2628	2968	cmd.exe	31
PID 2968 wrote to memory of 2628	2968	cmd.exe	31
PID 2628 wrote to memory of 2476	2628	remcos.exe	32
PID 2628 wrote to memory of 2476	2628	remcos.exe	32
PID 2628 wrote to memory of 2476	2628	remcos.exe	32
PID 2628 wrote to memory of 2476	2628	remcos.exe	32

C:\Users\Admin\AppData\Local\Temp\HOTFIX.exe
"C:\Users\Admin\AppData\Local\Temp\HOTFIX.exe"
1⤵
- Modifies WinLogon for persistence
- Adds policy Run key to start application
- Adds Run key to start application
- Modifies WinLogon
- Suspicious use of WriteProcessMemory
PID:2280
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2968
- - C:\Windows\SysWOW64\PING.EXE
    PING 127.0.0.1 -n 2
    3⤵
    - Runs ping.exe
    PID:2540
- - 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
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2628
  - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
      "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
      4⤵
      PID:2476

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 Information Discovery

1

T1082

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
92KB

MD5
49dea8978a30fad5001a5f689b7f15e1

SHA1
317c883761e60af918ab9748d7417d931963849f

SHA256
d138d810c8b0d8770b31b62f87a2b51bdf33ac1920b41a80007ed718397e7390

SHA512
dc3c29adbd1ad52bcba7fb0b24985798abc51c90984f3b556b448380c036407b92bf6f4275252c0e864b330aea00de6f0096945286f28be1a415fde20833c0dd

Download Submit

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads