Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    08/10/2023, 12:47

General

  • Target

    file.exe

  • Size

    284KB

  • MD5

    d1de288c58de023e8aad492868da3b92

  • SHA1

    530d8675705fee02d103c076706585f8f7a97de2

  • SHA256

    ead20c77e005c89bcc2a699892caa8775d7a7aa2c15d5170fd3d4b783f8f3ee3

  • SHA512

    9179f17800fe35a816c3dc29a6d936e56658f253b83fac6c396cad5fd2f8c2c4e0beb62013c4d2625e13a5ba9ba7332f5bbadb6702eb441cc1a07e995365906e

  • SSDEEP

    3072:FcSalqHSwBWbacDEgFAdpW1Z8AZLJDAM/a9:taYlWeeEucpCZZZq

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).

  • 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:4076
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bdrelrqy\
      2⤵
        PID:4060
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\uoogjtxj.exe" C:\Windows\SysWOW64\bdrelrqy\
        2⤵
          PID:4424
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create bdrelrqy binPath= "C:\Windows\SysWOW64\bdrelrqy\uoogjtxj.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3828
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description bdrelrqy "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4600
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start bdrelrqy
          2⤵
          • Launches sc.exe
          PID:2156
        • 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:4472
      • C:\Windows\SysWOW64\bdrelrqy\uoogjtxj.exe
        C:\Windows\SysWOW64\bdrelrqy\uoogjtxj.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3308
        • 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:464

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        11.7MB

        MD5

        fdfd922c3e85f68b1751fdf2a954ed49

        SHA1

        1f24bf4612d5780e28850bcb7944f300e178e467

        SHA256

        81c936a6c78fa29875694e80f3b826af5804b9876fd48c333438574390d2b0c6

        SHA512

        0ced048df6ab2add1da363cc5a1cdb2ea775d0c97cb6eeaf0ec20ce3c0b53f1b112b2fba180f277ed62557f4b2ec779510e0227e9edf8079a891df79a829e5be

      • C:\Windows\SysWOW64\bdrelrqy\uoogjtxj.exe

        Filesize

        11.7MB

        MD5

        fdfd922c3e85f68b1751fdf2a954ed49

        SHA1

        1f24bf4612d5780e28850bcb7944f300e178e467

        SHA256

        81c936a6c78fa29875694e80f3b826af5804b9876fd48c333438574390d2b0c6

        SHA512

        0ced048df6ab2add1da363cc5a1cdb2ea775d0c97cb6eeaf0ec20ce3c0b53f1b112b2fba180f277ed62557f4b2ec779510e0227e9edf8079a891df79a829e5be

      • memory/464-32-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-22-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/464-57-0x0000000002BD0000-0x0000000002BD7000-memory.dmp

        Filesize

        28KB

      • memory/464-56-0x0000000007680000-0x0000000007A8B000-memory.dmp

        Filesize

        4.0MB

      • memory/464-52-0x0000000001FF0000-0x0000000001FF5000-memory.dmp

        Filesize

        20KB

      • memory/464-53-0x0000000007680000-0x0000000007A8B000-memory.dmp

        Filesize

        4.0MB

      • memory/464-49-0x0000000001FF0000-0x0000000001FF5000-memory.dmp

        Filesize

        20KB

      • memory/464-12-0x0000000000AA0000-0x0000000000AB5000-memory.dmp

        Filesize

        84KB

      • memory/464-15-0x0000000000AA0000-0x0000000000AB5000-memory.dmp

        Filesize

        84KB

      • memory/464-48-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-18-0x0000000000AA0000-0x0000000000AB5000-memory.dmp

        Filesize

        84KB

      • memory/464-19-0x0000000000AA0000-0x0000000000AB5000-memory.dmp

        Filesize

        84KB

      • memory/464-47-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-21-0x0000000000AA0000-0x0000000000AB5000-memory.dmp

        Filesize

        84KB

      • memory/464-33-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-25-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/464-26-0x0000000001F50000-0x0000000001F56000-memory.dmp

        Filesize

        24KB

      • memory/464-29-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-46-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-45-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-38-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-35-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-36-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-40-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-39-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-34-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-37-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-41-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-42-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-43-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/464-44-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/3308-16-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB

      • memory/3308-17-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB

      • memory/3308-11-0x00000000025F0000-0x00000000026F0000-memory.dmp

        Filesize

        1024KB

      • memory/4076-1-0x00000000024E0000-0x00000000025E0000-memory.dmp

        Filesize

        1024KB

      • memory/4076-4-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB

      • memory/4076-9-0x0000000003FD0000-0x0000000003FE3000-memory.dmp

        Filesize

        76KB

      • memory/4076-8-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB

      • memory/4076-2-0x0000000003FD0000-0x0000000003FE3000-memory.dmp

        Filesize

        76KB

      • memory/4076-6-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB