remcos | 58f4cc11fbdc77c519550d82efc187dc282e2830dcb6240f7d9d118a53656d0e

Analysis

max time kernel
149s
max time network
150s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
23/10/2024, 09:52

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General

Target

remcos_a.exe
Size

469KB
MD5

285656e57001e3aeafcf8a88529a3de6
SHA1

c4f53e6f8ed42c1c5cda0bb79c50c1913e00d7d5
SHA256

58f4cc11fbdc77c519550d82efc187dc282e2830dcb6240f7d9d118a53656d0e
SHA512

7f158c9b9a8331a5fb189fa8d2115d96459e1a8f30f5bae503754874b81e67c5620a080125e420722780895c9515511f4e1fa3f016c711bc058e7a64eba336d4
SSDEEP

12288:Wmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQS9Gn9:uiLJbpI7I2WhQqZ7s9

Score

10^/10

remcos remotehost discovery evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

core-hook.gl.at.ply.gg:7242

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
DllSetup.exe
copy_folder
dllplugins
delete_file
true
hide_file
true
hide_keylog_file
false
install_flag
true
install_path
%WinDir%\System32
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-AB5LV3
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat 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
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	DllSetup.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Remcos = "\"C:\\Windows\\SysWOW64\\dllplugins\\DllSetup.exe\""	DllSetup.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	iexplore.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Remcos = "\"C:\\Windows\\SysWOW64\\dllplugins\\DllSetup.exe\""	iexplore.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	remcos_a.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Remcos = "\"C:\\Windows\\SysWOW64\\dllplugins\\DllSetup.exe\""	remcos_a.exe

Deletes itself 1 IoCs

pid	Process
1464	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
2188	DllSetup.exe

Loads dropped DLL 4 IoCs

pid	Process
2508	cmd.exe
2188	DllSetup.exe
2188	DllSetup.exe
2188	DllSetup.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\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\dllplugins\\DllSetup.exe\""	remcos_a.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\dllplugins\\DllSetup.exe\""	remcos_a.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\dllplugins\\DllSetup.exe\""	DllSetup.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\dllplugins\\DllSetup.exe\""	DllSetup.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\dllplugins\\DllSetup.exe\""	iexplore.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\dllplugins\\DllSetup.exe\""	iexplore.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\dllplugins\DllSetup.exe	remcos_a.exe
File opened for modification	C:\Windows\SysWOW64\dllplugins\DllSetup.exe	remcos_a.exe
File opened for modification	C:\Windows\SysWOW64\dllplugins	remcos_a.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2188 set thread context of 2728	2188	DllSetup.exe	39
PID 2728 set thread context of 2240	2728	iexplore.exe	45

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 12 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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DllSetup.exe
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	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos_a.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	iexplore.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe

Modifies registry key 1 TTPs 3 IoCs

Modify Registry

T1112

pid	Process
532	reg.exe
2604	reg.exe
2600	reg.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
2188	DllSetup.exe
2728	iexplore.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeRestorePrivilege	2188	DllSetup.exe
Token: SeBackupPrivilege	2188	DllSetup.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 1920 wrote to memory of 2068	1920	remcos_a.exe	31
PID 1920 wrote to memory of 2068	1920	remcos_a.exe	31
PID 1920 wrote to memory of 2068	1920	remcos_a.exe	31
PID 1920 wrote to memory of 2068	1920	remcos_a.exe	31
PID 2068 wrote to memory of 532	2068	cmd.exe	33
PID 2068 wrote to memory of 532	2068	cmd.exe	33
PID 2068 wrote to memory of 532	2068	cmd.exe	33
PID 2068 wrote to memory of 532	2068	cmd.exe	33
PID 1920 wrote to memory of 1464	1920	remcos_a.exe	34
PID 1920 wrote to memory of 1464	1920	remcos_a.exe	34
PID 1920 wrote to memory of 1464	1920	remcos_a.exe	34
PID 1920 wrote to memory of 1464	1920	remcos_a.exe	34
PID 1464 wrote to memory of 2508	1464	WScript.exe	35
PID 1464 wrote to memory of 2508	1464	WScript.exe	35
PID 1464 wrote to memory of 2508	1464	WScript.exe	35
PID 1464 wrote to memory of 2508	1464	WScript.exe	35
PID 2508 wrote to memory of 2188	2508	cmd.exe	37
PID 2508 wrote to memory of 2188	2508	cmd.exe	37
PID 2508 wrote to memory of 2188	2508	cmd.exe	37
PID 2508 wrote to memory of 2188	2508	cmd.exe	37
PID 2508 wrote to memory of 2188	2508	cmd.exe	37
PID 2508 wrote to memory of 2188	2508	cmd.exe	37
PID 2508 wrote to memory of 2188	2508	cmd.exe	37
PID 2188 wrote to memory of 2988	2188	DllSetup.exe	38
PID 2188 wrote to memory of 2988	2188	DllSetup.exe	38
PID 2188 wrote to memory of 2988	2188	DllSetup.exe	38
PID 2188 wrote to memory of 2988	2188	DllSetup.exe	38
PID 2188 wrote to memory of 2988	2188	DllSetup.exe	38
PID 2188 wrote to memory of 2988	2188	DllSetup.exe	38
PID 2188 wrote to memory of 2988	2188	DllSetup.exe	38
PID 2188 wrote to memory of 2728	2188	DllSetup.exe	39
PID 2188 wrote to memory of 2728	2188	DllSetup.exe	39
PID 2188 wrote to memory of 2728	2188	DllSetup.exe	39
PID 2188 wrote to memory of 2728	2188	DllSetup.exe	39
PID 2188 wrote to memory of 2728	2188	DllSetup.exe	39
PID 2188 wrote to memory of 2728	2188	DllSetup.exe	39
PID 2188 wrote to memory of 2728	2188	DllSetup.exe	39
PID 2188 wrote to memory of 2728	2188	DllSetup.exe	39
PID 2728 wrote to memory of 2888	2728	iexplore.exe	41
PID 2728 wrote to memory of 2888	2728	iexplore.exe	41
PID 2728 wrote to memory of 2888	2728	iexplore.exe	41
PID 2728 wrote to memory of 2888	2728	iexplore.exe	41
PID 2728 wrote to memory of 2888	2728	iexplore.exe	41
PID 2728 wrote to memory of 2888	2728	iexplore.exe	41
PID 2728 wrote to memory of 2888	2728	iexplore.exe	41
PID 2888 wrote to memory of 2604	2888	cmd.exe	43
PID 2888 wrote to memory of 2604	2888	cmd.exe	43
PID 2888 wrote to memory of 2604	2888	cmd.exe	43
PID 2888 wrote to memory of 2604	2888	cmd.exe	43
PID 2888 wrote to memory of 2604	2888	cmd.exe	43
PID 2888 wrote to memory of 2604	2888	cmd.exe	43
PID 2888 wrote to memory of 2604	2888	cmd.exe	43
PID 2988 wrote to memory of 2600	2988	cmd.exe	44
PID 2988 wrote to memory of 2600	2988	cmd.exe	44
PID 2988 wrote to memory of 2600	2988	cmd.exe	44
PID 2988 wrote to memory of 2600	2988	cmd.exe	44
PID 2988 wrote to memory of 2600	2988	cmd.exe	44
PID 2988 wrote to memory of 2600	2988	cmd.exe	44
PID 2988 wrote to memory of 2600	2988	cmd.exe	44
PID 2728 wrote to memory of 2240	2728	iexplore.exe	45
PID 2728 wrote to memory of 2240	2728	iexplore.exe	45
PID 2728 wrote to memory of 2240	2728	iexplore.exe	45
PID 2728 wrote to memory of 2240	2728	iexplore.exe	45
PID 2728 wrote to memory of 2240	2728	iexplore.exe	45

C:\Users\Admin\AppData\Local\Temp\remcos_a.exe
"C:\Users\Admin\AppData\Local\Temp\remcos_a.exe"
1⤵
- Adds policy Run key to start application
- Adds Run key to start application
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1920
- 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:2068
- - 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:532
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1464
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Windows\SysWOW64\dllplugins\DllSetup.exe"
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2508
  - - C:\Windows\SysWOW64\dllplugins\DllSetup.exe
      C:\Windows\SysWOW64\dllplugins\DllSetup.exe
      4⤵
      Adds policy Run key to start application
      Executes dropped EXE
      Loads dropped DLL
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: MapViewOfSection
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2188
    - - 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:2988
      - 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:2600
    - - \??\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 WriteProcessMemory
        
        PID:2728
      - 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:2888
        
        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:2604
      - C:\Windows\SysWOW64\svchost.exe
        
        svchost.exe
        6⤵
        System Location Discovery: System Language Discovery
        
        PID:2240

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

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:\Users\Admin\AppData\Local\Temp\install.vbs

Filesize
536B

MD5
19523a09e476e3d57c6c545a1a18b85d

SHA1
b51dacc3bdcffc59aee76a8d5227030e71e96118

SHA256
351ff79dc392c547e1eb23371fd3e740fcb6e9d2a9ab2ab123ec0ebe7bea4517

SHA512
d18216d67c1195118e97a78e0a7267f680eb42ae7410d93a45fb66cca9489fb683edd2e51670df67e9d2895e9c97003a8199757d15829edaf0af5608586a2ab4

Download Submit
\Windows\SysWOW64\dllplugins\DllSetup.exe

Filesize
469KB

MD5
285656e57001e3aeafcf8a88529a3de6

SHA1
c4f53e6f8ed42c1c5cda0bb79c50c1913e00d7d5

SHA256
58f4cc11fbdc77c519550d82efc187dc282e2830dcb6240f7d9d118a53656d0e

SHA512
7f158c9b9a8331a5fb189fa8d2115d96459e1a8f30f5bae503754874b81e67c5620a080125e420722780895c9515511f4e1fa3f016c711bc058e7a64eba336d4

Download Submit
memory/2240-22-0x0000000000170000-0x00000000001EF000-memory.dmp

Filesize
508KB

Download
memory/2240-20-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2240-24-0x0000000000170000-0x00000000001EF000-memory.dmp

Filesize
508KB

Download
memory/2240-21-0x0000000000170000-0x00000000001EF000-memory.dmp

Filesize
508KB

Download
memory/2728-26-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-29-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-14-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-16-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2728-25-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-13-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-27-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-28-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-17-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-30-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-31-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-32-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-33-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-34-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-35-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-36-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-37-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-38-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download
memory/2728-39-0x0000000000090000-0x000000000010F000-memory.dmp

Filesize
508KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads