Analysis

  • max time kernel
    149s
  • max time network
    164s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    20-04-2022 14:21

General

  • Target

    7a333a9533b7b791e250cb6c1b8888443067abc4f7753b3fe93a233f691941d8.exe

  • Size

    5.0MB

  • MD5

    1bb13a8dc3f7047507644e2554a3ed1c

  • SHA1

    01f11194e7c1bd6895213da9d3424b31994cb016

  • SHA256

    7a333a9533b7b791e250cb6c1b8888443067abc4f7753b3fe93a233f691941d8

  • SHA512

    57bace1d7b712aa21f49bf9958ace981e909976f9d9b1e9fd75d7a20741491d1ba2c2ce505ba63e66f2861b1584833c268a795aa54dde7ba670b4284248d93ca

Malware Config

Signatures

  • Modifies WinLogon for persistence 2 TTPs 3 IoCs
  • RMS

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

  • Executes dropped EXE 8 IoCs
  • Sets file to hidden 1 TTPs

    Modifies file attributes to stop it showing in Explorer etc.

  • UPX packed file 9 IoCs

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

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops file in System32 directory 3 IoCs
  • Drops file in Windows directory 22 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Runs .reg file with regedit 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: SetClipboardViewer 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7a333a9533b7b791e250cb6c1b8888443067abc4f7753b3fe93a233f691941d8.exe
    "C:\Users\Admin\AppData\Local\Temp\7a333a9533b7b791e250cb6c1b8888443067abc4f7753b3fe93a233f691941d8.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Checks computer location settings
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4984
    • C:\Windows\System64\1rfusclient.exe
      "C:\Windows\System64\1rfusclient.exe"
      2⤵
      • Modifies WinLogon for persistence
      • Executes dropped EXE
      • Checks computer location settings
      • Adds Run key to start application
      • Drops file in Windows directory
      • Suspicious use of WriteProcessMemory
      PID:2180
      • C:\Windows\SysWOW64\regedit.exe
        "C:\Windows\System32\regedit.exe" /s "C:\Windows\Zont911\Regedit.reg"
        3⤵
        • Runs .reg file with regedit
        PID:4924
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Windows\Zont911\Tupe.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1108
        • C:\Windows\SysWOW64\chcp.com
          Chcp 1251
          4⤵
            PID:4748
          • C:\Windows\System64\rutserv.exe
            "C:\Windows\System64\rutserv.exe" /silentinstall
            4⤵
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            PID:4704
          • C:\Windows\System64\rutserv.exe
            "C:\Windows\System64\rutserv.exe" /firewall
            4⤵
            • Executes dropped EXE
            • Suspicious use of SetWindowsHookEx
            PID:2660
          • C:\Windows\System64\rutserv.exe
            "C:\Windows\System64\rutserv.exe" /start
            4⤵
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            PID:1944
          • C:\Windows\SysWOW64\attrib.exe
            attrib "C:\Windows\System64\*.*" +s +h
            4⤵
            • Drops file in Windows directory
            • Views/modifies file attributes
            PID:5012
          • C:\Windows\SysWOW64\attrib.exe
            attrib "C:\Windows\System64" +s +h
            4⤵
            • Drops file in Windows directory
            • Views/modifies file attributes
            PID:5016
    • C:\Windows\System64\rutserv.exe
      C:\Windows\System64\rutserv.exe
      1⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Drops file in Windows directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2208
      • C:\Windows\System64\rfusclient.exe
        C:\Windows\System64\rfusclient.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:4996
        • C:\Windows\System64\rfusclient.exe
          C:\Windows\System64\rfusclient.exe /tray
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: SetClipboardViewer
          PID:1712
      • C:\Windows\System64\rfusclient.exe
        C:\Windows\System64\rfusclient.exe /tray
        2⤵
        • Executes dropped EXE
        PID:5116

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Windows\System64\1rfusclient.exe

      Filesize

      5.0MB

      MD5

      1bb13a8dc3f7047507644e2554a3ed1c

      SHA1

      01f11194e7c1bd6895213da9d3424b31994cb016

      SHA256

      7a333a9533b7b791e250cb6c1b8888443067abc4f7753b3fe93a233f691941d8

      SHA512

      57bace1d7b712aa21f49bf9958ace981e909976f9d9b1e9fd75d7a20741491d1ba2c2ce505ba63e66f2861b1584833c268a795aa54dde7ba670b4284248d93ca

    • C:\Windows\System64\1rfusclient.exe

      Filesize

      5.0MB

      MD5

      1bb13a8dc3f7047507644e2554a3ed1c

      SHA1

      01f11194e7c1bd6895213da9d3424b31994cb016

      SHA256

      7a333a9533b7b791e250cb6c1b8888443067abc4f7753b3fe93a233f691941d8

      SHA512

      57bace1d7b712aa21f49bf9958ace981e909976f9d9b1e9fd75d7a20741491d1ba2c2ce505ba63e66f2861b1584833c268a795aa54dde7ba670b4284248d93ca

    • C:\Windows\System64\rfusclient.exe

      Filesize

      1.5MB

      MD5

      eac85a4a79a168cb47c0810e23e6d2fe

      SHA1

      0e053ed568dc2f07d76b0e006a9e19655797b89e

      SHA256

      86b9593479937ca7dfe9ef6744cc321808c0585b63312cb50952f709c498096f

      SHA512

      b424136d58d266ba045a2ad95efeb8cdc69d77a9442521bf196390b934a7752bf728daeaf2fb3df887abf9c719a2526a8179e368cb228603b9243e3c7148c8e0

    • C:\Windows\System64\rfusclient.exe

      Filesize

      1.5MB

      MD5

      eac85a4a79a168cb47c0810e23e6d2fe

      SHA1

      0e053ed568dc2f07d76b0e006a9e19655797b89e

      SHA256

      86b9593479937ca7dfe9ef6744cc321808c0585b63312cb50952f709c498096f

      SHA512

      b424136d58d266ba045a2ad95efeb8cdc69d77a9442521bf196390b934a7752bf728daeaf2fb3df887abf9c719a2526a8179e368cb228603b9243e3c7148c8e0

    • C:\Windows\System64\rfusclient.exe

      Filesize

      1.5MB

      MD5

      eac85a4a79a168cb47c0810e23e6d2fe

      SHA1

      0e053ed568dc2f07d76b0e006a9e19655797b89e

      SHA256

      86b9593479937ca7dfe9ef6744cc321808c0585b63312cb50952f709c498096f

      SHA512

      b424136d58d266ba045a2ad95efeb8cdc69d77a9442521bf196390b934a7752bf728daeaf2fb3df887abf9c719a2526a8179e368cb228603b9243e3c7148c8e0

    • C:\Windows\System64\rfusclient.exe

      Filesize

      1.5MB

      MD5

      eac85a4a79a168cb47c0810e23e6d2fe

      SHA1

      0e053ed568dc2f07d76b0e006a9e19655797b89e

      SHA256

      86b9593479937ca7dfe9ef6744cc321808c0585b63312cb50952f709c498096f

      SHA512

      b424136d58d266ba045a2ad95efeb8cdc69d77a9442521bf196390b934a7752bf728daeaf2fb3df887abf9c719a2526a8179e368cb228603b9243e3c7148c8e0

    • C:\Windows\System64\rutserv.exe

      Filesize

      1.8MB

      MD5

      fa4b26c53cfb2661ba072cf8da181b1a

      SHA1

      295f19aad28e80c5e371078989815c612110229c

      SHA256

      3a92288781a1f411f43e59ae32ea78b89997e7a5d1b6f12771f39fb6fa345db7

      SHA512

      f6399c683c41f518a1096c87303758d50d6419e62317bfe2d362f66e5048f81583be12b32348dc095a34c0de0a79867376fdb8fc4677080d665e001b38cbfa64

    • C:\Windows\System64\rutserv.exe

      Filesize

      1.8MB

      MD5

      fa4b26c53cfb2661ba072cf8da181b1a

      SHA1

      295f19aad28e80c5e371078989815c612110229c

      SHA256

      3a92288781a1f411f43e59ae32ea78b89997e7a5d1b6f12771f39fb6fa345db7

      SHA512

      f6399c683c41f518a1096c87303758d50d6419e62317bfe2d362f66e5048f81583be12b32348dc095a34c0de0a79867376fdb8fc4677080d665e001b38cbfa64

    • C:\Windows\System64\rutserv.exe

      Filesize

      1.8MB

      MD5

      fa4b26c53cfb2661ba072cf8da181b1a

      SHA1

      295f19aad28e80c5e371078989815c612110229c

      SHA256

      3a92288781a1f411f43e59ae32ea78b89997e7a5d1b6f12771f39fb6fa345db7

      SHA512

      f6399c683c41f518a1096c87303758d50d6419e62317bfe2d362f66e5048f81583be12b32348dc095a34c0de0a79867376fdb8fc4677080d665e001b38cbfa64

    • C:\Windows\System64\rutserv.exe

      Filesize

      1.8MB

      MD5

      fa4b26c53cfb2661ba072cf8da181b1a

      SHA1

      295f19aad28e80c5e371078989815c612110229c

      SHA256

      3a92288781a1f411f43e59ae32ea78b89997e7a5d1b6f12771f39fb6fa345db7

      SHA512

      f6399c683c41f518a1096c87303758d50d6419e62317bfe2d362f66e5048f81583be12b32348dc095a34c0de0a79867376fdb8fc4677080d665e001b38cbfa64

    • C:\Windows\System64\rutserv.exe

      Filesize

      1.8MB

      MD5

      fa4b26c53cfb2661ba072cf8da181b1a

      SHA1

      295f19aad28e80c5e371078989815c612110229c

      SHA256

      3a92288781a1f411f43e59ae32ea78b89997e7a5d1b6f12771f39fb6fa345db7

      SHA512

      f6399c683c41f518a1096c87303758d50d6419e62317bfe2d362f66e5048f81583be12b32348dc095a34c0de0a79867376fdb8fc4677080d665e001b38cbfa64

    • C:\Windows\System64\vp8decoder.dll

      Filesize

      378KB

      MD5

      d43fa82fab5337ce20ad14650085c5d9

      SHA1

      678aa092075ff65b6815ffc2d8fdc23af8425981

      SHA256

      c022958429edd94bfe31f2eacfe24ff6b45d6f12747725c449a36116373de03b

      SHA512

      103e61a9f58df03316676a074487e50ec518479c11068df3736df139b85c7671048c65bce0ef2c55b3c50c61fde54e9e6c7d1b795aea71263ae94c91d4874e0d

    • C:\Windows\System64\vp8encoder.dll

      Filesize

      1.6MB

      MD5

      dab4646806dfca6d0e0b4d80fa9209d6

      SHA1

      8244dfe22ec2090eee89dad103e6b2002059d16a

      SHA256

      cb6ef96d3a66ef08ec2c8640b751a52d6d4f4530cf01162a69966f0fd5153587

      SHA512

      aa5eb93bf23a10de797d6fb52a55a95d36bc48927c76fedd81e0c48872745cb7f7d1b3f230eaae42fd4e79b6a59ca707e56bd6963b03644cbd5984f11e98d6e7

    • C:\Windows\Zont911\Regedit.reg

      Filesize

      11KB

      MD5

      b8b5df7bd66996fb97cf2f80f866a7b1

      SHA1

      2fca802b31d0074f5ab68a45854fa3bbdf2603db

      SHA256

      e7878603265c8d6d0fa092a5b5ee3755380ed33216a8836d80dc49cac92366d2

      SHA512

      af6b9409b7a902f64073d0b39163d6d71cbe11f9063b2ea7dc926c235acb9a500fe7f3776b39d442e3e8817ecd1a8b1fdac3811c4e740c4125d52c47fd4d1546

    • C:\Windows\Zont911\Tupe.bat

      Filesize

      357B

      MD5

      10cb21f5d07a83f4c3d66974cbc2cf79

      SHA1

      08e325ec7e92c3e3b9b7eb605ff6a8d9e4596f57

      SHA256

      58474de64432e063c41c427119b46d8aba84c13b067b52073f9e9863a963963a

      SHA512

      689ff96b0561bfe5a72bbc83ca190394ab7e76d1280595c8233463c92218610f25c3223ce1bd52e14073ca9bb5d28d239119427b98da70bb32063eb223374b8c

    • memory/1108-135-0x0000000000000000-mapping.dmp

    • memory/1712-155-0x0000000000000000-mapping.dmp

    • memory/1944-144-0x0000000000000000-mapping.dmp

    • memory/2180-130-0x0000000000000000-mapping.dmp

    • memory/2660-142-0x0000000000000000-mapping.dmp

    • memory/4704-139-0x0000000000000000-mapping.dmp

    • memory/4748-137-0x0000000000000000-mapping.dmp

    • memory/4924-133-0x0000000000000000-mapping.dmp

    • memory/4996-149-0x0000000000000000-mapping.dmp

    • memory/5012-153-0x0000000000000000-mapping.dmp

    • memory/5016-154-0x0000000000000000-mapping.dmp

    • memory/5116-150-0x0000000000000000-mapping.dmp