remcos | 634b3b97e0715993522a986c7dac869e12cd1fcd4ab78b4bb1bf40953b7b0dc3

General

Target

virus.exe
Size

469KB
MD5

8711da84b3ffd9e4c30473f09bab7ab7
SHA1

c08971ed441e0a8dc534c7892f15e29d3bc4f833
SHA256

634b3b97e0715993522a986c7dac869e12cd1fcd4ab78b4bb1bf40953b7b0dc3
SHA512

5b606ab159e6e122639b5f361c5ac5b5c3654efa69ddcf99aa3c6ecd2d2b9be92748752f218124e632f1de4dea0478c00fa67363da1eba2af79b8fedb1843fac
SSDEEP

12288:Omnk7iLJbpIpiRL6I2WhSKQ9ZsfZQS5n9:2iLJbpI7I2WhQqZ759

Score

10^/10

remcos remotehost discovery evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

it-double.gl.at.ply.gg:37981

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-ZAKZKI
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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	virus.exe
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	WScript.exe

Deletes itself 1 IoCs

pid	Process
3088	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
3892	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\USER\S-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\system.exe\""	virus.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\system.exe\""	virus.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\system.exe\""	system.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Windows\\SysWOW64\\Remcos\\system.exe\""	system.exe

Drops file in System32 directory 3 IoCs

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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3892 set thread context of 1816	3892	system.exe	95

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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	virus.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-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	virus.exe

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
2060	reg.exe
4416	reg.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3892	system.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2936 wrote to memory of 2364	2936	virus.exe	84
PID 2936 wrote to memory of 2364	2936	virus.exe	84
PID 2936 wrote to memory of 2364	2936	virus.exe	84
PID 2364 wrote to memory of 2060	2364	cmd.exe	86
PID 2364 wrote to memory of 2060	2364	cmd.exe	86
PID 2364 wrote to memory of 2060	2364	cmd.exe	86
PID 2936 wrote to memory of 3088	2936	virus.exe	87
PID 2936 wrote to memory of 3088	2936	virus.exe	87
PID 2936 wrote to memory of 3088	2936	virus.exe	87
PID 3088 wrote to memory of 2680	3088	WScript.exe	91
PID 3088 wrote to memory of 2680	3088	WScript.exe	91
PID 3088 wrote to memory of 2680	3088	WScript.exe	91
PID 2680 wrote to memory of 3892	2680	cmd.exe	93
PID 2680 wrote to memory of 3892	2680	cmd.exe	93
PID 2680 wrote to memory of 3892	2680	cmd.exe	93
PID 3892 wrote to memory of 4560	3892	system.exe	94
PID 3892 wrote to memory of 4560	3892	system.exe	94
PID 3892 wrote to memory of 4560	3892	system.exe	94
PID 3892 wrote to memory of 1816	3892	system.exe	95
PID 3892 wrote to memory of 1816	3892	system.exe	95
PID 3892 wrote to memory of 1816	3892	system.exe	95
PID 3892 wrote to memory of 1816	3892	system.exe	95
PID 4560 wrote to memory of 4416	4560	cmd.exe	97
PID 4560 wrote to memory of 4416	4560	cmd.exe	97
PID 4560 wrote to memory of 4416	4560	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\virus.exe
"C:\Users\Admin\AppData\Local\Temp\virus.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:2936
- 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:2364
- - 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:2060
- 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:3088
- - 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:2680
  - - 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:3892
    - - 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:4560
      - 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:4416
    - - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe"
        5⤵
        
        PID:1816

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
518B

MD5
bc3f00d2e01d23ee235f3a68776330a4

SHA1
11ff07ccbe0fab8c5f1d0adc80d0c1c7077b6311

SHA256
987cb6d98b0b2a77f5a2348571b6275901339a3d93a3df9270a21c11f63d1899

SHA512
610a4102432919e38c38bbde19421100d242782ec7d6470df0caa18948455125e392b6ad39ad9a9766bfd71cccd12d8162f85f5a3802016f208d2e394d84624a

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

Filesize
469KB

MD5
8711da84b3ffd9e4c30473f09bab7ab7

SHA1
c08971ed441e0a8dc534c7892f15e29d3bc4f833

SHA256
634b3b97e0715993522a986c7dac869e12cd1fcd4ab78b4bb1bf40953b7b0dc3

SHA512
5b606ab159e6e122639b5f361c5ac5b5c3654efa69ddcf99aa3c6ecd2d2b9be92748752f218124e632f1de4dea0478c00fa67363da1eba2af79b8fedb1843fac

Download Submit
memory/1816-9-0x0000000000F00000-0x0000000000F7F000-memory.dmp

Filesize
508KB

Download
memory/1816-10-0x0000000000F00000-0x0000000000F7F000-memory.dmp

Filesize
508KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads