remcos | c1a6955a83cac6e02e942ec2537754e00fa46c31fe9256dba3080580dfed2f42

Analysis

max time kernel
147s
max time network
138s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
20/11/2024, 10:37

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General

Target

stub.exe
Size

469KB
MD5

eecc6454151bd19031cb2b258d2a4c9b
SHA1

1bfe8c247be8682c2f620e48ac33175e14f81dda
SHA256

c1a6955a83cac6e02e942ec2537754e00fa46c31fe9256dba3080580dfed2f42
SHA512

b7b9160ecd87fa031a1db6d0cc5ea4748cf6979f7147779586b8a612d285798beb4a012d17dd4a5aa7311a6109f77115ea857162a8348462edc3bde508b7e9c5
SSDEEP

12288:Wmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSgn9:uiLJbpI7I2WhQqZ7g9

Score

10^/10

remcos remotehost discovery evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

else-directors.gl.at.ply.gg:56448

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
Bitdefender.exe
copy_folder
Bitdefender
delete_file
true
hide_file
true
hide_keylog_file
false
install_flag
true
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-WZKDKV
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
VisualStudioServer
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

UAC bypass 3 TTPs 3 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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe

Adds policy Run key to start application 2 TTPs 6 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\VisualStudioServer = "\"C:\\ProgramData\\Bitdefender\\Bitdefender.exe\""	iexplore.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	stub.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\VisualStudioServer = "\"C:\\ProgramData\\Bitdefender\\Bitdefender.exe\""	stub.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	Bitdefender.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\VisualStudioServer = "\"C:\\ProgramData\\Bitdefender\\Bitdefender.exe\""	Bitdefender.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	iexplore.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	stub.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	WScript.exe

Deletes itself 1 IoCs

pid	Process
3624	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
4152	Bitdefender.exe

Adds Run key to start application 2 TTPs 6 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\VisualStudioServer = "\"C:\\ProgramData\\Bitdefender\\Bitdefender.exe\""	Bitdefender.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\VisualStudioServer = "\"C:\\ProgramData\\Bitdefender\\Bitdefender.exe\""	iexplore.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\VisualStudioServer = "\"C:\\ProgramData\\Bitdefender\\Bitdefender.exe\""	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\VisualStudioServer = "\"C:\\ProgramData\\Bitdefender\\Bitdefender.exe\""	stub.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\VisualStudioServer = "\"C:\\ProgramData\\Bitdefender\\Bitdefender.exe\""	stub.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\VisualStudioServer = "\"C:\\ProgramData\\Bitdefender\\Bitdefender.exe\""	Bitdefender.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4152 set thread context of 3372	4152	Bitdefender.exe	92
PID 3372 set thread context of 4876	3372	iexplore.exe	99

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 11 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.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	Bitdefender.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	iexplore.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	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	stub.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	stub.exe

Modifies registry key 1 TTPs 3 IoCs

Modify Registry

T1112

pid	Process
2700	reg.exe
216	reg.exe
3516	reg.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
4152	Bitdefender.exe
3372	iexplore.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3372	iexplore.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3372	iexplore.exe

Suspicious use of WriteProcessMemory 35 IoCs

description	pid	Process	procid_target
PID 1712 wrote to memory of 4576	1712	stub.exe	84
PID 1712 wrote to memory of 4576	1712	stub.exe	84
PID 1712 wrote to memory of 4576	1712	stub.exe	84
PID 4576 wrote to memory of 2700	4576	cmd.exe	86
PID 4576 wrote to memory of 2700	4576	cmd.exe	86
PID 4576 wrote to memory of 2700	4576	cmd.exe	86
PID 1712 wrote to memory of 3624	1712	stub.exe	87
PID 1712 wrote to memory of 3624	1712	stub.exe	87
PID 1712 wrote to memory of 3624	1712	stub.exe	87
PID 3624 wrote to memory of 4528	3624	WScript.exe	88
PID 3624 wrote to memory of 4528	3624	WScript.exe	88
PID 3624 wrote to memory of 4528	3624	WScript.exe	88
PID 4528 wrote to memory of 4152	4528	cmd.exe	90
PID 4528 wrote to memory of 4152	4528	cmd.exe	90
PID 4528 wrote to memory of 4152	4528	cmd.exe	90
PID 4152 wrote to memory of 4004	4152	Bitdefender.exe	91
PID 4152 wrote to memory of 4004	4152	Bitdefender.exe	91
PID 4152 wrote to memory of 4004	4152	Bitdefender.exe	91
PID 4152 wrote to memory of 3372	4152	Bitdefender.exe	92
PID 4152 wrote to memory of 3372	4152	Bitdefender.exe	92
PID 4152 wrote to memory of 3372	4152	Bitdefender.exe	92
PID 4152 wrote to memory of 3372	4152	Bitdefender.exe	92
PID 3372 wrote to memory of 2008	3372	iexplore.exe	94
PID 3372 wrote to memory of 2008	3372	iexplore.exe	94
PID 3372 wrote to memory of 2008	3372	iexplore.exe	94
PID 4004 wrote to memory of 216	4004	cmd.exe	97
PID 4004 wrote to memory of 216	4004	cmd.exe	97
PID 4004 wrote to memory of 216	4004	cmd.exe	97
PID 2008 wrote to memory of 3516	2008	cmd.exe	98
PID 2008 wrote to memory of 3516	2008	cmd.exe	98
PID 2008 wrote to memory of 3516	2008	cmd.exe	98
PID 3372 wrote to memory of 4876	3372	iexplore.exe	99
PID 3372 wrote to memory of 4876	3372	iexplore.exe	99
PID 3372 wrote to memory of 4876	3372	iexplore.exe	99
PID 3372 wrote to memory of 4876	3372	iexplore.exe	99

C:\Users\Admin\AppData\Local\Temp\stub.exe
"C:\Users\Admin\AppData\Local\Temp\stub.exe"
1⤵
- Adds policy Run key to start application
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1712
- 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:4576
- - 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:2700
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Checks computer location settings
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3624
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\ProgramData\Bitdefender\Bitdefender.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4528
  - - C:\ProgramData\Bitdefender\Bitdefender.exe
      C:\ProgramData\Bitdefender\Bitdefender.exe
      4⤵
      Adds policy Run key to start application
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: MapViewOfSection
      Suspicious use of WriteProcessMemory
      PID:4152
    - - 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
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:4004
      - 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
        6⤵
        UAC bypass
        System Location Discovery: System Language Discovery
        Modifies registry key
        
        PID:216
    - - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe"
        5⤵
        Adds policy Run key to start application
        Adds Run key to start application
        Suspicious use of SetThreadContext
        System Location Discovery: System Language Discovery
        Suspicious behavior: MapViewOfSection
        Suspicious use of FindShellTrayWindow
        Suspicious use of SendNotifyMessage
        Suspicious use of WriteProcessMemory
        
        PID:3372
      - 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
        6⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:2008
        
        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
        7⤵
        UAC bypass
        System Location Discovery: System Language Discovery
        Modifies registry key
        
        PID:3516
      - C:\Windows\SysWOW64\svchost.exe
        
        svchost.exe
        6⤵
        
        PID:4876

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\Bitdefender\Bitdefender.exe

Filesize
469KB

MD5
eecc6454151bd19031cb2b258d2a4c9b

SHA1
1bfe8c247be8682c2f620e48ac33175e14f81dda

SHA256
c1a6955a83cac6e02e942ec2537754e00fa46c31fe9256dba3080580dfed2f42

SHA512
b7b9160ecd87fa031a1db6d0cc5ea4748cf6979f7147779586b8a612d285798beb4a012d17dd4a5aa7311a6109f77115ea857162a8348462edc3bde508b7e9c5

Download Submit
C:\Users\Admin\AppData\Local\Temp\install.vbs

Filesize
526B

MD5
97c3d0c687f8fce413698cb3cd93a436

SHA1
457bdaecd0ed1a105efa42d31ba7737e5f71d76d

SHA256
d133a68455e1837b70a85cce64e82d69f9cf8b04554c84b592bfe1fd97f98860

SHA512
1a417f68919258c14f5f467533af7f84fdd42bbf5005ba5a1fe744cd08298c2b818f3362f4dacedc23da991f931caceccdfadab978d1b916a03906669276cfe3

Download Submit
memory/3372-17-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-26-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-11-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-12-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-29-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-28-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-9-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-18-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-19-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-20-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-23-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-24-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-25-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-10-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/3372-27-0x0000000000750000-0x00000000007CF000-memory.dmp

Filesize
508KB

Download
memory/4876-16-0x0000000000A50000-0x0000000000ACF000-memory.dmp

Filesize
508KB

Download
memory/4876-15-0x0000000000A50000-0x0000000000ACF000-memory.dmp

Filesize
508KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads