Analysis

  • max time kernel
    144s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    17/04/2022, 14:56

General

  • Target
    8cc23b0aaa5df43e2bfd85ba9d8e5ac83f1070a96aeb09f533b7b6be50602ac6.exe
  • Size 4.2MB
  • Sample220417-sa4g8sgfbj
  • SHA256 8cc23b0aaa5df43e2bfd85ba9d8e5ac83f1070a96aeb09f533b7b6be50602ac6
  • MD5 SHA1 SHA512

Malware Config

Signatures

  • RMS

    Remote Manipulator System (RMS) is a remote access tool developed by Russian organization TektonIT.

  • Executes dropped EXE 9 IoCs
  • Sets file to hidden 1 TTPs

    Modifies file attributes to stop it showing in Explorer etc.

  • UPX packed file 11 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Drops file in System32 directory 3 IoCs
  • Drops file in Program Files directory 21 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Kills process with taskkill 2 IoCs
  • Runs .reg file with regedit 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 18 IoCs
  • Suspicious behavior: SetClipboardViewer 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of SetWindowsHookEx 8 IoCs
  • Suspicious use of WriteProcessMemory 45 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8cc23b0aaa5df43e2bfd85ba9d8e5ac83f1070a96aeb09f533b7b6be50602ac6.exe
    "C:\Users\Admin\AppData\Local\Temp\8cc23b0aaa5df43e2bfd85ba9d8e5ac83f1070a96aeb09f533b7b6be50602ac6.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1648
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\start.bat" "
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3344
      • C:\Users\Admin\AppData\Local\Temp\done.sfx.exe
        done.sfx.exe -p12345 -dC:\Users\Admin\AppData\Local\Temp
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Suspicious use of WriteProcessMemory
        PID:2160
        • C:\Users\Admin\AppData\Local\Temp\done.exe
          "C:\Users\Admin\AppData\Local\Temp\done.exe"
          4⤵
          • Executes dropped EXE
          • Checks computer location settings
          • Drops file in Program Files directory
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:4940
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Program Files (x86)\Skype\Skype\install.bat" "
            5⤵
            • Drops file in Program Files directory
            • Suspicious use of WriteProcessMemory
            PID:4532
            • C:\Windows\SysWOW64\taskkill.exe
              taskkill /f /im 4t4t5
              6⤵
              • Kills process with taskkill
              • Suspicious use of AdjustPrivilegeToken
              PID:4492
            • C:\Windows\SysWOW64\taskkill.exe
              taskkill /f /im g4rgt
              6⤵
              • Kills process with taskkill
              • Suspicious use of AdjustPrivilegeToken
              PID:4144
            • C:\Windows\SysWOW64\reg.exe
              reg delete "70t9j" /f
              6⤵
                PID:4568
              • C:\Windows\SysWOW64\regedit.exe
                regedit /s "regedit.reg"
                6⤵
                • Runs .reg file with regedit
                PID:4464
              • C:\Windows\SysWOW64\attrib.exe
                attrib +s +h "C:\Program Files\rtsd\*.*"
                6⤵
                • Drops file in Program Files directory
                • Views/modifies file attributes
                PID:1728
              • C:\Program Files\rtsd\rutserv.exe
                rutserv.exe /silentinstall
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of SetWindowsHookEx
                PID:532
              • C:\Program Files\rtsd\rutserv.exe
                rutserv.exe /firewall
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of SetWindowsHookEx
                PID:2944
              • C:\Program Files\rtsd\rutserv.exe
                rutserv.exe /start
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of SetWindowsHookEx
                PID:4512
    • C:\Program Files\rtsd\rutserv.exe
      "C:\Program Files\rtsd\rutserv.exe"
      1⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Drops file in Program Files directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4344
      • C:\Program Files\rtsd\rfusclient.exe
        "C:\Program Files\rtsd\rfusclient.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:2744
        • C:\Program Files\rtsd\rfusclient.exe
          "C:\Program Files\rtsd\rfusclient.exe" /tray
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: SetClipboardViewer
          PID:2044
      • C:\Program Files\rtsd\rfusclient.exe
        "C:\Program Files\rtsd\rfusclient.exe" /tray
        2⤵
        • Executes dropped EXE
        • Suspicious behavior: SetClipboardViewer
        PID:3980

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          install.bat

          • Path C:\Program Files (x86)\Skype\Skype\install.bat
          • Size 884B
          • SHA256 db1602d244bad54475174194204f4604804094c8156b8ea2b1dc81879be8ac92
          • MD5 SHA1 SHA512

          regedit.reg

          • Path C:\Program Files (x86)\Skype\Skype\regedit.reg
          • Size 12KB
          • SHA256 49525765484a492bdc74a26bf2baf5f2dda6907dc1866ca80bd3d97c1177fd4d
          • MD5 SHA1 SHA512 SSDEEP

          rfusclient.exe

          • Path C:\Program Files (x86)\Skype\Skype\rfusclient.exe
          • Size 1.5MB
          • SHA256 1e1ae9fdf6c9ee34d42fb2e65790bbbf4d4ef1cc9a474925f77991d323f91896
          • MD5 SHA1 SHA512 SSDEEP

          rutserv.exe

          • Path C:\Program Files (x86)\Skype\Skype\rutserv.exe
          • Size 1.8MB
          • SHA256 cd80744e9965b3cc76acd0ea5062a2eca70a69f8a93a0eeea5bd4c47f53a5d96
          • MD5 SHA1 SHA512 SSDEEP

          vp8decoder.dll

          • Path C:\Program Files (x86)\Skype\Skype\vp8decoder.dll
          • Size 378KB
          • SHA256 c022958429edd94bfe31f2eacfe24ff6b45d6f12747725c449a36116373de03b
          • MD5 SHA1 SHA512 SSDEEP

          vp8encoder.dll

          • Path C:\Program Files (x86)\Skype\Skype\vp8encoder.dll
          • Size 1.6MB
          • SHA256 cb6ef96d3a66ef08ec2c8640b751a52d6d4f4530cf01162a69966f0fd5153587
          • MD5 SHA1 SHA512 SSDEEP

          rfusclient.exe

          • Path C:\Program Files\rtsd\rfusclient.exe
          • Size 1.5MB
          • SHA256 1e1ae9fdf6c9ee34d42fb2e65790bbbf4d4ef1cc9a474925f77991d323f91896
          • MD5 SHA1 SHA512 SSDEEP

          rfusclient.exe

          • Path C:\Program Files\rtsd\rfusclient.exe
          • Size 1.5MB
          • SHA256 1e1ae9fdf6c9ee34d42fb2e65790bbbf4d4ef1cc9a474925f77991d323f91896
          • MD5 SHA1 SHA512 SSDEEP

          rfusclient.exe

          • Path C:\Program Files\rtsd\rfusclient.exe
          • Size 1.5MB
          • SHA256 1e1ae9fdf6c9ee34d42fb2e65790bbbf4d4ef1cc9a474925f77991d323f91896
          • MD5 SHA1 SHA512 SSDEEP

          rfusclient.exe

          • Path C:\Program Files\rtsd\rfusclient.exe
          • Size 1.5MB
          • SHA256 1e1ae9fdf6c9ee34d42fb2e65790bbbf4d4ef1cc9a474925f77991d323f91896
          • MD5 SHA1 SHA512 SSDEEP

          rutserv.exe

          • Path C:\Program Files\rtsd\rutserv.exe
          • Size 1.8MB
          • SHA256 cd80744e9965b3cc76acd0ea5062a2eca70a69f8a93a0eeea5bd4c47f53a5d96
          • MD5 SHA1 SHA512 SSDEEP

          rutserv.exe

          • Path C:\Program Files\rtsd\rutserv.exe
          • Size 1.8MB
          • SHA256 cd80744e9965b3cc76acd0ea5062a2eca70a69f8a93a0eeea5bd4c47f53a5d96
          • MD5 SHA1 SHA512 SSDEEP

          rutserv.exe

          • Path C:\Program Files\rtsd\rutserv.exe
          • Size 1.8MB
          • SHA256 cd80744e9965b3cc76acd0ea5062a2eca70a69f8a93a0eeea5bd4c47f53a5d96
          • MD5 SHA1 SHA512 SSDEEP

          rutserv.exe

          • Path C:\Program Files\rtsd\rutserv.exe
          • Size 1.8MB
          • SHA256 cd80744e9965b3cc76acd0ea5062a2eca70a69f8a93a0eeea5bd4c47f53a5d96
          • MD5 SHA1 SHA512 SSDEEP

          rutserv.exe

          • Path C:\Program Files\rtsd\rutserv.exe
          • Size 1.8MB
          • SHA256 cd80744e9965b3cc76acd0ea5062a2eca70a69f8a93a0eeea5bd4c47f53a5d96
          • MD5 SHA1 SHA512 SSDEEP

          vp8decoder.dll

          • Path C:\Program Files\rtsd\vp8decoder.dll
          • Size 378KB
          • SHA256 c022958429edd94bfe31f2eacfe24ff6b45d6f12747725c449a36116373de03b
          • MD5 SHA1 SHA512 SSDEEP

          vp8encoder.dll

          • Path C:\Program Files\rtsd\vp8encoder.dll
          • Size 1.6MB
          • SHA256 cb6ef96d3a66ef08ec2c8640b751a52d6d4f4530cf01162a69966f0fd5153587
          • MD5 SHA1 SHA512 SSDEEP

          Start.bat

          • Path C:\Users\Admin\AppData\Local\Temp\Start.bat
          • Size 29B
          • SHA256 33a1a9c8075a826cf9af1bea7bbde3bcdc359a59104556df73004d31e6e81510
          • MD5 SHA1 SHA512

          done.exe

          • Path C:\Users\Admin\AppData\Local\Temp\done.exe
          • Size 3.9MB
          • SHA256 eeaaae1af00f3ea508729324c617fe4e07333f29edb7405adfda9aacff4bf3c8
          • MD5 SHA1 SHA512 SSDEEP

          done.exe

          • Path C:\Users\Admin\AppData\Local\Temp\done.exe
          • Size 3.9MB
          • SHA256 eeaaae1af00f3ea508729324c617fe4e07333f29edb7405adfda9aacff4bf3c8
          • MD5 SHA1 SHA512 SSDEEP

          done.sfx.exe

          • Path C:\Users\Admin\AppData\Local\Temp\done.sfx.exe
          • Size 4.1MB
          • SHA256 09093128167ba929e88b21458c2b019d62ea427d2c953431ed18bd36eeb58afa
          • MD5 SHA1 SHA512 SSDEEP

          done.sfx.exe

          • Path C:\Users\Admin\AppData\Local\Temp\done.sfx.exe
          • Size 4.1MB
          • SHA256 09093128167ba929e88b21458c2b019d62ea427d2c953431ed18bd36eeb58afa
          • MD5 SHA1 SHA512 SSDEEP