remcos | bc74405d530b50d63eaa5fd282dd477cb2607b4935f603a34d0a22066ac667f3

General

Target

Luna.exe
Size

469KB
MD5

0e1f18269f4d5830d1963b033de49c31
SHA1

d1b43487f7ed369e64109e40b43f9f9d7a582c2f
SHA256

bc74405d530b50d63eaa5fd282dd477cb2607b4935f603a34d0a22066ac667f3
SHA512

047dccca911644287422fe0ac2c65d02179b6ffacb9e4cceff89b5dd7350b9b270e2e82ca621c265937df02fc31f13c5d6bf0bc65750965999b012a9d4d8ec87
SSDEEP

12288:Wmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSon9:uiLJbpI7I2WhQqZ7o9

Score

10^/10

remcos remotehost discovery evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

items-jeffrey.gl.at.ply.gg:58427

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
system.exe
copy_folder
Remcos
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-W6XH0D
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
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

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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	Luna.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	WScript.exe

Deletes itself 1 IoCs

pid	Process
1240	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
432	system.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\\system.exe\""	system.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\system.exe\""	Luna.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\system.exe\""	Luna.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\system.exe\""	system.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\Remcos\system.exe	Luna.exe
File opened for modification	C:\Windows\SysWOW64\Remcos\system.exe	Luna.exe
File opened for modification	C:\Windows\SysWOW64\Remcos	Luna.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 432 set thread context of 2020	432	system.exe	94

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	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Luna.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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	system.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	Luna.exe

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
4480	reg.exe
4368	reg.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
432	system.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 4384 wrote to memory of 4072	4384	Luna.exe	83
PID 4384 wrote to memory of 4072	4384	Luna.exe	83
PID 4384 wrote to memory of 4072	4384	Luna.exe	83
PID 4072 wrote to memory of 4480	4072	cmd.exe	85
PID 4072 wrote to memory of 4480	4072	cmd.exe	85
PID 4072 wrote to memory of 4480	4072	cmd.exe	85
PID 4384 wrote to memory of 1240	4384	Luna.exe	87
PID 4384 wrote to memory of 1240	4384	Luna.exe	87
PID 4384 wrote to memory of 1240	4384	Luna.exe	87
PID 1240 wrote to memory of 3636	1240	WScript.exe	90
PID 1240 wrote to memory of 3636	1240	WScript.exe	90
PID 1240 wrote to memory of 3636	1240	WScript.exe	90
PID 3636 wrote to memory of 432	3636	cmd.exe	92
PID 3636 wrote to memory of 432	3636	cmd.exe	92
PID 3636 wrote to memory of 432	3636	cmd.exe	92
PID 432 wrote to memory of 4548	432	system.exe	93
PID 432 wrote to memory of 4548	432	system.exe	93
PID 432 wrote to memory of 4548	432	system.exe	93
PID 432 wrote to memory of 2020	432	system.exe	94
PID 432 wrote to memory of 2020	432	system.exe	94
PID 432 wrote to memory of 2020	432	system.exe	94
PID 432 wrote to memory of 2020	432	system.exe	94
PID 4548 wrote to memory of 4368	4548	cmd.exe	97
PID 4548 wrote to memory of 4368	4548	cmd.exe	97
PID 4548 wrote to memory of 4368	4548	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\Luna.exe
"C:\Users\Admin\AppData\Local\Temp\Luna.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4384
- 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:4072
- - 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:4480
- 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:1240
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Windows\SysWOW64\Remcos\system.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3636
  - - C:\Windows\SysWOW64\Remcos\system.exe
      C:\Windows\SysWOW64\Remcos\system.exe
      4⤵
      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:432
    - - 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:4548
      - 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:4368
    - - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe"
        5⤵
        
        PID:2020

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

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

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
516B

MD5
11bfb67f928b0558ccd925e17199f1d0

SHA1
1a6f10caf0575dac048571356a6f253c8e4d5fab

SHA256
94cdc47ae1407e5c1074cc6dd923d7f038a110b6d096e51e571224fb2e2a92f1

SHA512
7b72f01ac2163508d539fdbc19e4b4726ea2c39aec328e0d52617bccd9e3743a7d4a1bee5fd77f66d55069f5689f33f69404d8631d148486673da16406debd29

Download Submit
C:\Windows\SysWOW64\Remcos\system.exe

Filesize
469KB

MD5
0e1f18269f4d5830d1963b033de49c31

SHA1
d1b43487f7ed369e64109e40b43f9f9d7a582c2f

SHA256
bc74405d530b50d63eaa5fd282dd477cb2607b4935f603a34d0a22066ac667f3

SHA512
047dccca911644287422fe0ac2c65d02179b6ffacb9e4cceff89b5dd7350b9b270e2e82ca621c265937df02fc31f13c5d6bf0bc65750965999b012a9d4d8ec87

Download Submit
memory/2020-9-0x0000000000880000-0x00000000008FF000-memory.dmp

Filesize
508KB

Download
memory/2020-10-0x0000000000880000-0x00000000008FF000-memory.dmp

Filesize
508KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads