Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:19

General

  • Target

    7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8.exe

  • Size

    229KB

  • MD5

    ddb3205a92ff18ae17b3f9f93c7b197c

  • SHA1

    b77c666a2d7b1f63ba08316f9a221be6ac1f786a

  • SHA256

    7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8

  • SHA512

    db659ead4fd2ed186f221adf5bb9ab5b686253454eeb307ba247a99d8026c009d72ed11473d4622146c7b6cf59f445ad3b020ac3394d3f61af5bfd385b43c334

  • SSDEEP

    3072:lnUQviqZALXadUs0vEJimn1K29YbqYZgpLneYDR89fJ5j3UxS6MeILYS:lnUzPjflapLnsdT3U2eILY

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 2 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.

  • Deletes itself 1 IoCs
  • 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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8.exe
    "C:\Users\Admin\AppData\Local\Temp\7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3812
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yuzmgiiq\
      2⤵
        PID:3212
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ukkhtfvt.exe" C:\Windows\SysWOW64\yuzmgiiq\
        2⤵
          PID:1720
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create yuzmgiiq binPath= "C:\Windows\SysWOW64\yuzmgiiq\ukkhtfvt.exe /d\"C:\Users\Admin\AppData\Local\Temp\7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:5088
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description yuzmgiiq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1576
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start yuzmgiiq
          2⤵
          • Launches sc.exe
          PID:1304
        • 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:1636
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3812 -s 668
          2⤵
          • Program crash
          PID:5096
      • C:\Windows\SysWOW64\yuzmgiiq\ukkhtfvt.exe
        C:\Windows\SysWOW64\yuzmgiiq\ukkhtfvt.exe /d"C:\Users\Admin\AppData\Local\Temp\7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1972
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:4268
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1972 -s 540
          2⤵
          • Program crash
          PID:2440
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 1972 -ip 1972
        1⤵
          PID:1568
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 3812 -ip 3812
          1⤵
            PID:1464

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.8MB

            MD5

            caa345c6b088237b47a01ffd6bab43be

            SHA1

            1bb4160c159fae086c02afe49dd03de122eccc17

            SHA256

            c7b3235ef7ba6f1d47237deecab0dcee1985b3e190bd13e907b0df21c81f155c

            SHA512

            0ec086b526a2a98ed9813b2ed1a706fc7a9eb09f7e19470cf759373998861617a9bd2d6add927f6a2ffdad1e7a9ce82c950c4ff89ffbb639f4c801bdf33232fb

          • memory/1972-12-0x0000000000D30000-0x0000000000D43000-memory.dmp

            Filesize

            76KB

          • memory/1972-10-0x0000000000570000-0x0000000000670000-memory.dmp

            Filesize

            1024KB

          • memory/1972-13-0x0000000000400000-0x000000000043E000-memory.dmp

            Filesize

            248KB

          • memory/3812-2-0x0000000002180000-0x0000000002193000-memory.dmp

            Filesize

            76KB

          • memory/3812-3-0x0000000000400000-0x000000000043E000-memory.dmp

            Filesize

            248KB

          • memory/3812-1-0x0000000000480000-0x0000000000580000-memory.dmp

            Filesize

            1024KB

          • memory/3812-16-0x0000000000400000-0x000000000043E000-memory.dmp

            Filesize

            248KB

          • memory/4268-35-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-33-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-17-0x00000000012A0000-0x00000000012B5000-memory.dmp

            Filesize

            84KB

          • memory/4268-18-0x00000000012A0000-0x00000000012B5000-memory.dmp

            Filesize

            84KB

          • memory/4268-20-0x0000000003000000-0x000000000320F000-memory.dmp

            Filesize

            2.1MB

          • memory/4268-23-0x0000000003000000-0x000000000320F000-memory.dmp

            Filesize

            2.1MB

          • memory/4268-24-0x0000000002750000-0x0000000002756000-memory.dmp

            Filesize

            24KB

          • memory/4268-27-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-37-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-36-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-8-0x00000000012A0000-0x00000000012B5000-memory.dmp

            Filesize

            84KB

          • memory/4268-39-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-38-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-34-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-40-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-14-0x00000000012A0000-0x00000000012B5000-memory.dmp

            Filesize

            84KB

          • memory/4268-41-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-51-0x0000000007E80000-0x000000000828B000-memory.dmp

            Filesize

            4.0MB

          • memory/4268-50-0x00000000027F0000-0x00000000027F5000-memory.dmp

            Filesize

            20KB

          • memory/4268-47-0x00000000027F0000-0x00000000027F5000-memory.dmp

            Filesize

            20KB

          • memory/4268-46-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-45-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-54-0x0000000007E80000-0x000000000828B000-memory.dmp

            Filesize

            4.0MB

          • memory/4268-44-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-43-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-55-0x00000000033D0000-0x00000000033D7000-memory.dmp

            Filesize

            28KB

          • memory/4268-42-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-32-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-31-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-30-0x0000000002760000-0x0000000002770000-memory.dmp

            Filesize

            64KB

          • memory/4268-59-0x00000000012A0000-0x00000000012B5000-memory.dmp

            Filesize

            84KB