Analysis

  • max time kernel
    147s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240730-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01/08/2024, 01:22

General

  • Target
    4a79a8b83afd4feb2fd2e130d54f667fa9ee6c61ecf7d61efed3753ab2450775.exe
  • Size 986KB
  • Sample240801-brj2gstfrm
  • SHA256 4a79a8b83afd4feb2fd2e130d54f667fa9ee6c61ecf7d61efed3753ab2450775
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • remcos

Botnet
  • RemoteHost

C2
  • eadzagba1.duckdns.org:4877

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    Remcos

  • delete_file

    false

  • hide_file

    false

  • 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-3DF634

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Checks computer location settings 2 TTPs 3 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 2 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • 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.

  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 39 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4a79a8b83afd4feb2fd2e130d54f667fa9ee6c61ecf7d61efed3753ab2450775.exe
    "C:\Users\Admin\AppData\Local\Temp\4a79a8b83afd4feb2fd2e130d54f667fa9ee6c61ecf7d61efed3753ab2450775.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5108
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\yTDUjUzWijyB.exe"
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1360
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\yTDUjUzWijyB" /XML "C:\Users\Admin\AppData\Local\Temp\tmpDE3A.tmp"
      2⤵
      • System Location Discovery: System Language Discovery
      • Scheduled Task/Job: Scheduled Task
      PID:1704
    • C:\Users\Admin\AppData\Local\Temp\4a79a8b83afd4feb2fd2e130d54f667fa9ee6c61ecf7d61efed3753ab2450775.exe
      "C:\Users\Admin\AppData\Local\Temp\4a79a8b83afd4feb2fd2e130d54f667fa9ee6c61ecf7d61efed3753ab2450775.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:1992
      • C:\ProgramData\Remcos\remcos.exe
        "C:\ProgramData\Remcos\remcos.exe"
        3⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:3416
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\yTDUjUzWijyB.exe"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2812
        • C:\Windows\SysWOW64\schtasks.exe
          "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\yTDUjUzWijyB" /XML "C:\Users\Admin\AppData\Local\Temp\tmp11ED.tmp"
          4⤵
          • System Location Discovery: System Language Discovery
          • Scheduled Task/Job: Scheduled Task
          PID:2544
        • C:\ProgramData\Remcos\remcos.exe
          "C:\ProgramData\Remcos\remcos.exe"
          4⤵
          • Executes dropped EXE
          • Adds Run key to start application
          • System Location Discovery: System Language Discovery
          PID:556

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        remcos.exe

        • Path C:\ProgramData\Remcos\remcos.exe
        • Size 986KB
        • SHA256 4a79a8b83afd4feb2fd2e130d54f667fa9ee6c61ecf7d61efed3753ab2450775
        • MD5 SHA1 SHA512 SSDEEP

        powershell.exe.log

        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
        • Size 2KB
        • SHA256 6f8fd1b8d9788ad54eaeee329232187e24b7b43393a01aeba2d6e9675231fb69
        • MD5 SHA1 SHA512

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 18KB
        • SHA256 786e65bb4b34c9541f0ee1fbc26c4e4210df651e377977dcfb3b3ccce4ebdccb
        • MD5 SHA1 SHA512 SSDEEP

        __PSScriptPolicyTest_nj5nipjf.umt.ps1

        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_nj5nipjf.umt.ps1
        • Size 60B
        • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
        • MD5 SHA1 SHA512

        tmpDE3A.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\tmpDE3A.tmp
        • Size 1KB
        • SHA256 8b82c53cfeb4e0fda984f4a19653e6bb9aac34a6fa5a08f944489f0198ec7ebe
        • MD5 SHA1 SHA512

        memory/556-117-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-111-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-118-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-120-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-112-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-110-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-122-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-119-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-97-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-121-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-83-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-85-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-123-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/556-124-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/1360-64-0x0000000007470000-0x000000000748E000-memory.dmp

        memory/1360-74-0x0000000007B00000-0x0000000007B08000-memory.dmp

        memory/1360-14-0x0000000001400000-0x0000000001436000-memory.dmp

        memory/1360-34-0x0000000005620000-0x0000000005642000-memory.dmp

        memory/1360-40-0x00000000056C0000-0x0000000005726000-memory.dmp

        memory/1360-44-0x0000000005EA0000-0x0000000005F06000-memory.dmp

        memory/1360-17-0x00000000744B0000-0x0000000074C60000-memory.dmp

        memory/1360-50-0x0000000006010000-0x0000000006364000-memory.dmp

        memory/1360-16-0x00000000057C0000-0x0000000005DE8000-memory.dmp

        memory/1360-51-0x0000000006490000-0x00000000064AE000-memory.dmp

        memory/1360-52-0x0000000006A50000-0x0000000006A9C000-memory.dmp

        memory/1360-53-0x0000000006A10000-0x0000000006A42000-memory.dmp

        memory/1360-54-0x00000000713C0000-0x000000007140C000-memory.dmp

        memory/1360-22-0x00000000744B0000-0x0000000074C60000-memory.dmp

        memory/1360-65-0x00000000076A0000-0x0000000007743000-memory.dmp

        memory/1360-67-0x00000000077E0000-0x00000000077FA000-memory.dmp

        memory/1360-66-0x0000000007E20000-0x000000000849A000-memory.dmp

        memory/1360-68-0x0000000007850000-0x000000000785A000-memory.dmp

        memory/1360-69-0x0000000007A60000-0x0000000007AF6000-memory.dmp

        memory/1360-70-0x00000000079E0000-0x00000000079F1000-memory.dmp

        memory/1360-71-0x0000000007A10000-0x0000000007A1E000-memory.dmp

        memory/1360-72-0x0000000007A20000-0x0000000007A34000-memory.dmp

        memory/1360-73-0x0000000007B20000-0x0000000007B3A000-memory.dmp

        memory/1360-25-0x00000000744B0000-0x0000000074C60000-memory.dmp

        memory/1360-77-0x00000000744B0000-0x0000000074C60000-memory.dmp

        memory/1992-26-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/1992-21-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/1992-19-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/1992-18-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/1992-49-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2812-113-0x0000000007540000-0x0000000007554000-memory.dmp

        memory/2812-91-0x0000000005860000-0x0000000005BB4000-memory.dmp

        memory/2812-98-0x0000000006530000-0x000000000657C000-memory.dmp

        memory/2812-99-0x0000000070090000-0x00000000700DC000-memory.dmp

        memory/2812-109-0x0000000007250000-0x00000000072F3000-memory.dmp

        memory/5108-24-0x00000000744B0000-0x0000000074C60000-memory.dmp

        memory/5108-9-0x000000000AD20000-0x000000000ADBC000-memory.dmp

        memory/5108-0-0x00000000744BE000-0x00000000744BF000-memory.dmp

        memory/5108-8-0x0000000008320000-0x00000000083E2000-memory.dmp

        memory/5108-7-0x00000000082D0000-0x00000000082DE000-memory.dmp

        memory/5108-6-0x0000000005310000-0x0000000005326000-memory.dmp

        memory/5108-4-0x0000000004E20000-0x0000000004E2A000-memory.dmp

        memory/5108-5-0x00000000744B0000-0x0000000074C60000-memory.dmp

        memory/5108-3-0x0000000004E40000-0x0000000004ED2000-memory.dmp

        memory/5108-2-0x0000000005350000-0x00000000058F4000-memory.dmp

        memory/5108-1-0x0000000000310000-0x000000000040C000-memory.dmp