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Analysis

  • max time kernel
    158s
  • max time network
    174s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11/10/2023, 12:44

General

  • Target

    file.exe

  • Size

    333KB

  • MD5

    b08ce09bc71caeb447e21432944adbf9

  • SHA1

    c35f503eb3da0d55d395f7436b993b4004ca4f9f

  • SHA256

    dafa682a801d878ba74bcb69573d33d2534ca0db04f52d29206a2ad360e12f47

  • SHA512

    d74132620183939e781bdf7c7c44d242f1f32cbefa071dd29b7a0abbf87c3c47357b75ae94c8013a154bcaf78c66abffc740907ec232a21e368c99a31569c089

  • SSDEEP

    3072:BWOrpckmv8i5dcwsGiaggHrWKyF40ChzfmpiPvMm2Jd7M5SLJL1C7AqLQLybO1:gOrpbmUudcBGNW/3Qr4uEDb7cz7xIyK

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.

  • 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 1 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 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:3500
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gbkggxga\
      2⤵
        PID:852
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rpemfvqm.exe" C:\Windows\SysWOW64\gbkggxga\
        2⤵
          PID:948
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gbkggxga binPath= "C:\Windows\SysWOW64\gbkggxga\rpemfvqm.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:428
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gbkggxga "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3920
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gbkggxga
          2⤵
          • Launches sc.exe
          PID:1572
        • 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:940
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3500 -s 1232
          2⤵
          • Program crash
          PID:4436
      • C:\Windows\SysWOW64\gbkggxga\rpemfvqm.exe
        C:\Windows\SysWOW64\gbkggxga\rpemfvqm.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1240
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:1044
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1240 -s 532
          2⤵
          • Program crash
          PID:3976
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 3500 -ip 3500
        1⤵
          PID:1612
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1240 -ip 1240
          1⤵
            PID:4580

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            10.5MB

            MD5

            25d3a6c953dc602f97829be7c66642a7

            SHA1

            517ede299ee80ebfe6d5eb0a0f798d1c2e3f3987

            SHA256

            f4d68c4c0b571aab74f52216759eec77c98965e7b547081bd3b3463c9dd3fab7

            SHA512

            69da96cd43d1572e69999c749abc67e2c31f6bcb13bb21bb9e4c010ed566d6a7c788d0431f670874699c96f1466b5baeed03df8bd8b20a95d6363ce1d031b230

          • C:\Windows\SysWOW64\gbkggxga\rpemfvqm.exe

            Filesize

            10.5MB

            MD5

            25d3a6c953dc602f97829be7c66642a7

            SHA1

            517ede299ee80ebfe6d5eb0a0f798d1c2e3f3987

            SHA256

            f4d68c4c0b571aab74f52216759eec77c98965e7b547081bd3b3463c9dd3fab7

            SHA512

            69da96cd43d1572e69999c749abc67e2c31f6bcb13bb21bb9e4c010ed566d6a7c788d0431f670874699c96f1466b5baeed03df8bd8b20a95d6363ce1d031b230

          • memory/1044-42-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-25-0x00000000023F0000-0x00000000023F6000-memory.dmp

            Filesize

            24KB

          • memory/1044-56-0x0000000002FF0000-0x0000000002FF7000-memory.dmp

            Filesize

            28KB

          • memory/1044-55-0x0000000007B00000-0x0000000007F0B000-memory.dmp

            Filesize

            4.0MB

          • memory/1044-10-0x0000000000D40000-0x0000000000D55000-memory.dmp

            Filesize

            84KB

          • memory/1044-52-0x0000000007B00000-0x0000000007F0B000-memory.dmp

            Filesize

            4.0MB

          • memory/1044-51-0x0000000002FE0000-0x0000000002FE5000-memory.dmp

            Filesize

            20KB

          • memory/1044-15-0x0000000000D40000-0x0000000000D55000-memory.dmp

            Filesize

            84KB

          • memory/1044-48-0x0000000002FE0000-0x0000000002FE5000-memory.dmp

            Filesize

            20KB

          • memory/1044-17-0x0000000000D40000-0x0000000000D55000-memory.dmp

            Filesize

            84KB

          • memory/1044-32-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-18-0x0000000000D40000-0x0000000000D55000-memory.dmp

            Filesize

            84KB

          • memory/1044-20-0x0000000000D40000-0x0000000000D55000-memory.dmp

            Filesize

            84KB

          • memory/1044-21-0x0000000002C00000-0x0000000002E0F000-memory.dmp

            Filesize

            2.1MB

          • memory/1044-24-0x0000000002C00000-0x0000000002E0F000-memory.dmp

            Filesize

            2.1MB

          • memory/1044-45-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-33-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-31-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-47-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-28-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-37-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-35-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-36-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-34-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-38-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-39-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-40-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-41-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-46-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-43-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1044-44-0x0000000002E10000-0x0000000002E20000-memory.dmp

            Filesize

            64KB

          • memory/1240-16-0x0000000000400000-0x00000000025A6000-memory.dmp

            Filesize

            33.6MB

          • memory/1240-14-0x0000000000400000-0x00000000025A6000-memory.dmp

            Filesize

            33.6MB

          • memory/1240-9-0x0000000002E70000-0x0000000002E83000-memory.dmp

            Filesize

            76KB

          • memory/1240-8-0x00000000028B0000-0x00000000029B0000-memory.dmp

            Filesize

            1024KB

          • memory/3500-1-0x0000000002840000-0x0000000002940000-memory.dmp

            Filesize

            1024KB

          • memory/3500-4-0x0000000000400000-0x00000000025A6000-memory.dmp

            Filesize

            33.6MB

          • memory/3500-13-0x0000000000400000-0x00000000025A6000-memory.dmp

            Filesize

            33.6MB

          • memory/3500-2-0x00000000042F0000-0x0000000004303000-memory.dmp

            Filesize

            76KB