remcos | f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea

General

Target

f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Size

92KB
MD5

76588f4bc306a7adbea175dfbdd9b0bb
SHA1

e4d32b94becf0a27194eddefd3acb709924175de
SHA256

f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea
SHA512

f1a7d5a18da82c25a1c8be319b52e5997f8e9ca45a2b07f6ab173dbe578ba3f4d81de5ad7d1633a324798260bd6342ee9ffbbfeac155d52bd1c1f98e7ef44b1c
SSDEEP

1536:4hhW0YTGZWdVseJxaM9kraLdV2QkQ1TbPX8IHOCkIsI4ESHNTh9E+JP19qkP6vre:ehzYTGWVvJ8f2v1TbPzuMsIFSHNThy+H

Score

10^/10

remcos host discovery evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

C2

nhatde0166-47406.portmap.host:47406

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
true
hide_file
true
hide_keylog_file
true
install_flag
true
install_path
%WinDir%\System32
keylog_crypt
true
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%WinDir%\System32
mouse_option
false
mutex
remcos_whmmzkguja
screenshot_crypt
false
screenshot_flag
false
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:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	remcos.exe

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

UAC bypass 3 TTPs 2 IoCs

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

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:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.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:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	remcos.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe

Executes dropped EXE 1 IoCs

pid	Process
2440	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\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Windows\\SysWOW64\\remcos\\remcos.exe\""	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.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\	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	remcos.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\remcos\remcos.exe	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
File opened for modification	C:\Windows\SysWOW64\remcos\remcos.exe	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
File opened for modification	C:\Windows\SysWOW64\remcos	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
File opened for modification	C:\Windows\SysWOW64\remcos\logs.dat	remcos.exe
File created	C:\Windows\SysWOW64\remcos\logs.dat	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 8 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	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.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
4776	PING.EXE

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
3900	reg.exe
3624	reg.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4776	PING.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2440	remcos.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 3896 wrote to memory of 1484	3896	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	83
PID 3896 wrote to memory of 1484	3896	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	83
PID 3896 wrote to memory of 1484	3896	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	83
PID 1484 wrote to memory of 3624	1484	cmd.exe	85
PID 1484 wrote to memory of 3624	1484	cmd.exe	85
PID 1484 wrote to memory of 3624	1484	cmd.exe	85
PID 3896 wrote to memory of 1128	3896	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	86
PID 3896 wrote to memory of 1128	3896	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	86
PID 3896 wrote to memory of 1128	3896	f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe	86
PID 1128 wrote to memory of 4776	1128	cmd.exe	88
PID 1128 wrote to memory of 4776	1128	cmd.exe	88
PID 1128 wrote to memory of 4776	1128	cmd.exe	88
PID 1128 wrote to memory of 2440	1128	cmd.exe	89
PID 1128 wrote to memory of 2440	1128	cmd.exe	89
PID 1128 wrote to memory of 2440	1128	cmd.exe	89
PID 2440 wrote to memory of 5012	2440	remcos.exe	90
PID 2440 wrote to memory of 5012	2440	remcos.exe	90
PID 2440 wrote to memory of 5012	2440	remcos.exe	90
PID 2440 wrote to memory of 1452	2440	remcos.exe	91
PID 2440 wrote to memory of 1452	2440	remcos.exe	91
PID 2440 wrote to memory of 1452	2440	remcos.exe	91
PID 5012 wrote to memory of 3900	5012	cmd.exe	93
PID 5012 wrote to memory of 3900	5012	cmd.exe	93
PID 5012 wrote to memory of 3900	5012	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.exe
"C:\Users\Admin\AppData\Local\Temp\f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea.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
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3896
- 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:1484
- - 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:3624
- 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:1128
- - 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:4776
- - C:\Windows\SysWOW64\remcos\remcos.exe
    "C:\Windows\SysWOW64\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
    - Drops file in System32 directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2440
  - - 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
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:5012
    - - 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
        5⤵
        UAC bypass
        System Location Discovery: System Language Discovery
        Modifies registry key
        
        PID:3900
  - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
      "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
      4⤵
      PID:1452

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
198B

MD5
e6d737e4b326823697a567993c761d2a

SHA1
000c8a205fb1d37f10e9899257024615551b2301

SHA256
8c98c41dcde13523a984d5bec113efd09f6d290839db2f3f97afa4381ceda7ee

SHA512
3bb3e14f35078b52f5689975aeef5752e2f15ef082fc98e043d1458323638c05166202e1e722a35bb8d41403d142322ab422f148e7651acce1d93c8beeb174fa

Download Submit
C:\Windows\SysWOW64\remcos\remcos.exe

Filesize
92KB

MD5
76588f4bc306a7adbea175dfbdd9b0bb

SHA1
e4d32b94becf0a27194eddefd3acb709924175de

SHA256
f906133186afd69662f2f43f5b85edf5048e823a3e38709a20e27c9e22d991ea

SHA512
f1a7d5a18da82c25a1c8be319b52e5997f8e9ca45a2b07f6ab173dbe578ba3f4d81de5ad7d1633a324798260bd6342ee9ffbbfeac155d52bd1c1f98e7ef44b1c

Download Submit

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads