Analysis

  • max time kernel
    150s
  • max time network
    158s
  • 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 13:35

General

  • Target

    3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe

  • Size

    203KB

  • MD5

    e80ed6ccb333b7fc33ffc98bca43b57d

  • SHA1

    170281a608fe94eee06a9f45466f6a47bd2272e3

  • SHA256

    3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3

  • SHA512

    3209c004cebb1e2f544f7d8457175a62da8a225bc08bcbb051c240eddc610ca8e1ddfe7f6d758d2e09517030afad689b6805fc2b8b801a1f182c04369191a30d

  • SSDEEP

    3072:eafjdfYraZJXENc8uCXJiXK1K2LEpzUCV+PaIh9bwdANblLNBNKRrxbU+cmH:eafjqQ15OCyLLkCVkxbDco

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\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe
    "C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1560
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ziwkrein\
      2⤵
        PID:1304
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mbtafdia.exe" C:\Windows\SysWOW64\ziwkrein\
        2⤵
          PID:988
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ziwkrein binPath= "C:\Windows\SysWOW64\ziwkrein\mbtafdia.exe /d\"C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ziwkrein "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2388
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ziwkrein
          2⤵
          • Launches sc.exe
          PID:3268
        • 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:4612
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1560 -s 1236
          2⤵
          • Program crash
          PID:3804
      • C:\Windows\SysWOW64\ziwkrein\mbtafdia.exe
        C:\Windows\SysWOW64\ziwkrein\mbtafdia.exe /d"C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:744
        • 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:1032
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 744 -s 544
          2⤵
          • Program crash
          PID:1188
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 1560 -ip 1560
        1⤵
          PID:1744
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 744 -ip 744
          1⤵
            PID:4996

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            10.4MB

            MD5

            195e0163e5971257ee0a007fbd885e85

            SHA1

            0170159696c3ed7ba46e6504319f28c94de0cda8

            SHA256

            d19c781b2d4098d1f1534c6663115f962b0189b6e7da808d2b8af8b599431e62

            SHA512

            0aa46b6d1ed6784503f260242316980762c0d894f8b8d0325bcfd79e628d4f48cc85210999c66ead9bff7faf052bd7e84d6595e84bca0b57d789e65873925e8f

          • memory/744-9-0x00000000004C0000-0x00000000004D3000-memory.dmp

            Filesize

            76KB

          • memory/744-15-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/744-11-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/744-8-0x0000000000610000-0x0000000000710000-memory.dmp

            Filesize

            1024KB

          • memory/1032-43-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-38-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-56-0x00000000031F0000-0x00000000031F7000-memory.dmp

            Filesize

            28KB

          • memory/1032-14-0x0000000000E80000-0x0000000000E95000-memory.dmp

            Filesize

            84KB

          • memory/1032-55-0x0000000007D00000-0x000000000810B000-memory.dmp

            Filesize

            4.0MB

          • memory/1032-47-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-17-0x0000000000E80000-0x0000000000E95000-memory.dmp

            Filesize

            84KB

          • memory/1032-18-0x0000000000E80000-0x0000000000E95000-memory.dmp

            Filesize

            84KB

          • memory/1032-20-0x0000000000E80000-0x0000000000E95000-memory.dmp

            Filesize

            84KB

          • memory/1032-21-0x0000000002C80000-0x0000000002E8F000-memory.dmp

            Filesize

            2.1MB

          • memory/1032-24-0x0000000002C80000-0x0000000002E8F000-memory.dmp

            Filesize

            2.1MB

          • memory/1032-25-0x00000000021F0000-0x00000000021F6000-memory.dmp

            Filesize

            24KB

          • memory/1032-28-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-33-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-32-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-31-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-34-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-10-0x0000000000E80000-0x0000000000E95000-memory.dmp

            Filesize

            84KB

          • memory/1032-37-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-35-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-36-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-39-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-41-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-42-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-40-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-48-0x00000000031E0000-0x00000000031E5000-memory.dmp

            Filesize

            20KB

          • memory/1032-44-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-45-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-46-0x0000000002FD0000-0x0000000002FE0000-memory.dmp

            Filesize

            64KB

          • memory/1032-51-0x00000000031E0000-0x00000000031E5000-memory.dmp

            Filesize

            20KB

          • memory/1032-52-0x0000000007D00000-0x000000000810B000-memory.dmp

            Filesize

            4.0MB

          • memory/1560-1-0x0000000000790000-0x0000000000890000-memory.dmp

            Filesize

            1024KB

          • memory/1560-16-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/1560-2-0x00000000006E0000-0x00000000006F3000-memory.dmp

            Filesize

            76KB

          • memory/1560-3-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB