Analysis

  • max time kernel
    149s
  • 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
    10/10/2023, 12:23

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 7 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:4536
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zuoxvuis\
      2⤵
        PID:3748
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lxjolrqe.exe" C:\Windows\SysWOW64\zuoxvuis\
        2⤵
          PID:4792
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create zuoxvuis binPath= "C:\Windows\SysWOW64\zuoxvuis\lxjolrqe.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4604
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description zuoxvuis "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2744
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start zuoxvuis
          2⤵
          • Launches sc.exe
          PID:2340
        • 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:3144
      • C:\Windows\SysWOW64\zuoxvuis\lxjolrqe.exe
        C:\Windows\SysWOW64\zuoxvuis\lxjolrqe.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2956
        • 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:2288

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        12.6MB

        MD5

        9a381834b5fa1116ca31ed19976ad8ac

        SHA1

        d0680178c13eb1600f9964a13ca17630576dd577

        SHA256

        1ae2c76163245a7a7b456002b19c9e818ed23a44818a64dd26937d39a0cf005f

        SHA512

        60913036fa4cf6255bd99fde80b998fe2a063961cbd9be2ae22c14cb5f69124a633d781adfe4e1c9fa1c36bfbc866a62840ea32d4ed767de5d832a5899f9bcad

      • C:\Windows\SysWOW64\zuoxvuis\lxjolrqe.exe

        Filesize

        12.6MB

        MD5

        9a381834b5fa1116ca31ed19976ad8ac

        SHA1

        d0680178c13eb1600f9964a13ca17630576dd577

        SHA256

        1ae2c76163245a7a7b456002b19c9e818ed23a44818a64dd26937d39a0cf005f

        SHA512

        60913036fa4cf6255bd99fde80b998fe2a063961cbd9be2ae22c14cb5f69124a633d781adfe4e1c9fa1c36bfbc866a62840ea32d4ed767de5d832a5899f9bcad

      • memory/2288-41-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-30-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-55-0x0000000000C00000-0x0000000000C15000-memory.dmp

        Filesize

        84KB

      • memory/2288-56-0x0000000001FF0000-0x0000000001FF7000-memory.dmp

        Filesize

        28KB

      • memory/2288-54-0x0000000007800000-0x0000000007C0B000-memory.dmp

        Filesize

        4.0MB

      • memory/2288-51-0x0000000007800000-0x0000000007C0B000-memory.dmp

        Filesize

        4.0MB

      • memory/2288-11-0x0000000000C00000-0x0000000000C15000-memory.dmp

        Filesize

        84KB

      • memory/2288-15-0x0000000000C00000-0x0000000000C15000-memory.dmp

        Filesize

        84KB

      • memory/2288-50-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

        Filesize

        20KB

      • memory/2288-46-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-17-0x0000000000C00000-0x0000000000C15000-memory.dmp

        Filesize

        84KB

      • memory/2288-18-0x0000000000C00000-0x0000000000C15000-memory.dmp

        Filesize

        84KB

      • memory/2288-20-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/2288-23-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/2288-24-0x0000000001FC0000-0x0000000001FC6000-memory.dmp

        Filesize

        24KB

      • memory/2288-27-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-35-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-31-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-47-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

        Filesize

        20KB

      • memory/2288-32-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-37-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-33-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-34-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-36-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-39-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-40-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-38-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-42-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-45-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-43-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2288-44-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

        Filesize

        64KB

      • memory/2956-13-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB

      • memory/2956-16-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB

      • memory/2956-10-0x0000000002580000-0x0000000002680000-memory.dmp

        Filesize

        1024KB

      • memory/4536-1-0x00000000024D0000-0x00000000025D0000-memory.dmp

        Filesize

        1024KB

      • memory/4536-4-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB

      • memory/4536-8-0x0000000003FF0000-0x0000000004003000-memory.dmp

        Filesize

        76KB

      • memory/4536-7-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB

      • memory/4536-2-0x0000000003FF0000-0x0000000004003000-memory.dmp

        Filesize

        76KB