Analysis

  • max time kernel
    149s
  • max time network
    142s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    15-09-2021 07:10

General

  • Target

    a6fc0d48408d69e288d47a21659176f1.exe

  • Size

    841KB

  • MD5

    a6fc0d48408d69e288d47a21659176f1

  • SHA1

    dec8694a310328e062aeec260b84792f0ac11250

  • SHA256

    4e86e4ab9e20e94144838555a5e28d455f8998142d53a46f659cc9d07b2f458d

  • SHA512

    903a2f49b5bc8371ff4cd8bd10b9c49f1258293ca55c450aca5661b6c93d44ca811eb716afb14df620d40c1daae80f115dc5a31c494b7d14165d77c526a9a980

Malware Config

Extracted

Family

remcos

Version

3.2.0 Pro

Botnet

yankst

C2

194.127.179.121:5002

Attributes
  • audio_folder

    MicRecords

  • audio_path

    %AppData%

  • 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

    false

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • keylog_path

    %AppData%

  • mouse_option

    false

  • mutex

    Remcos-75950U

  • 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

  • take_screenshot_title

    notepad;solitaire;

Signatures

  • Remcos

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

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Modifies registry key 1 TTPs 3 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a6fc0d48408d69e288d47a21659176f1.exe
    "C:\Users\Admin\AppData\Local\Temp\a6fc0d48408d69e288d47a21659176f1.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of WriteProcessMemory
    PID:604
    • C:\Windows\SysWOW64\mobsync.exe
      C:\Windows\System32\mobsync.exe
      2⤵
        PID:1216
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Public\Trast.bat" "
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:1344
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /K C:\Users\Public\UKO.bat
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:1648
          • C:\Windows\SysWOW64\reg.exe
            reg delete hkcu\Environment /v windir /f
            4⤵
            • Modifies registry key
            PID:2024
          • C:\Windows\SysWOW64\reg.exe
            reg add hkcu\Environment /v windir /d "cmd /c start /min C:\Users\Public\KDECO.bat reg delete hkcu\Environment /v windir /f && REM "
            4⤵
            • Modifies registry key
            PID:2180
          • C:\Windows\SysWOW64\schtasks.exe
            schtasks /Run /TN \Microsoft\Windows\DiskCleanup\SilentCleanup /I
            4⤵
              PID:2408
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Public\nest.bat" "
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:2648
          • C:\Windows\SysWOW64\reg.exe
            reg delete hkcu\Environment /v windir /f
            3⤵
            • Modifies registry key
            PID:3564

      Network

      MITRE ATT&CK Matrix ATT&CK v6

      Persistence

      Registry Run Keys / Startup Folder

      1
      T1060

      Defense Evasion

      Modify Registry

      2
      T1112

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Public\Trast.bat
        MD5

        4068c9f69fcd8a171c67f81d4a952a54

        SHA1

        4d2536a8c28cdcc17465e20d6693fb9e8e713b36

        SHA256

        24222300c78180b50ed1f8361ba63cb27316ec994c1c9079708a51b4a1a9d810

        SHA512

        a64f9319acc51fffd0491c74dcd9c9084c2783b82f95727e4bfe387a8528c6dcf68f11418e88f1e133d115daf907549c86dd7ad866b2a7938add5225fbb2811d

      • C:\Users\Public\UKO.bat
        MD5

        eaf8d967454c3bbddbf2e05a421411f8

        SHA1

        6170880409b24de75c2dc3d56a506fbff7f6622c

        SHA256

        f35f2658455a2e40f151549a7d6465a836c33fa9109e67623916f889849eac56

        SHA512

        fe5be5c673e99f70c93019d01abb0a29dd2ecf25b2d895190ff551f020c28e7d8f99f65007f440f0f76c5bcac343b2a179a94d190c938ea3b9e1197890a412e9

      • C:\Users\Public\nest.bat
        MD5

        8ada51400b7915de2124baaf75e3414c

        SHA1

        1a7b9db12184ab7fd7fce1c383f9670a00adb081

        SHA256

        45aa3957c29865260a78f03eef18ae9aebdbf7bea751ecc88be4a799f2bb46c7

        SHA512

        9afc138157a4565294ca49942579cdb6f5d8084e56f9354738de62b585f4c0fa3e7f2cbc9541827f2084e3ff36c46eed29b46f5dd2444062ffcd05c599992e68

      • memory/604-117-0x0000000000670000-0x000000000068B000-memory.dmp
        Filesize

        108KB

      • memory/604-114-0x00000000004E0000-0x000000000058E000-memory.dmp
        Filesize

        696KB

      • memory/1216-130-0x0000000010590000-0x000000001060C000-memory.dmp
        Filesize

        496KB

      • memory/1216-128-0x0000000003100000-0x0000000003101000-memory.dmp
        Filesize

        4KB

      • memory/1216-127-0x0000000003040000-0x0000000003041000-memory.dmp
        Filesize

        4KB

      • memory/1216-129-0x00000000030A0000-0x00000000030A1000-memory.dmp
        Filesize

        4KB

      • memory/1216-131-0x0000000000400000-0x0000000000479000-memory.dmp
        Filesize

        484KB

      • memory/1216-119-0x0000000000000000-mapping.dmp
      • memory/1344-120-0x0000000000000000-mapping.dmp
      • memory/1648-122-0x0000000000000000-mapping.dmp
      • memory/2024-124-0x0000000000000000-mapping.dmp
      • memory/2180-125-0x0000000000000000-mapping.dmp
      • memory/2408-126-0x0000000000000000-mapping.dmp
      • memory/2648-132-0x0000000000000000-mapping.dmp
      • memory/3564-134-0x0000000000000000-mapping.dmp