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 14:50

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:1860
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lmvulega\
      2⤵
        PID:2224
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ryfixleo.exe" C:\Windows\SysWOW64\lmvulega\
        2⤵
          PID:1624
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create lmvulega binPath= "C:\Windows\SysWOW64\lmvulega\ryfixleo.exe /d\"C:\Users\Admin\AppData\Local\Temp\7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description lmvulega "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2976
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start lmvulega
          2⤵
          • Launches sc.exe
          PID:468
        • 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:1912
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1860 -s 1036
          2⤵
          • Program crash
          PID:680
      • C:\Windows\SysWOW64\lmvulega\ryfixleo.exe
        C:\Windows\SysWOW64\lmvulega\ryfixleo.exe /d"C:\Users\Admin\AppData\Local\Temp\7c44a7de2a7c4175c761e08a2de5d2acd42ad3195d7686e5b8d507f99c30adc8.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2184
        • 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:5024
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2184 -s 524
          2⤵
          • Program crash
          PID:1180
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 1860 -ip 1860
        1⤵
          PID:940
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2184 -ip 2184
          1⤵
            PID:2988

          Network

          MITRE ATT&CK Matrix ATT&CK v13

          Persistence

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Privilege Escalation

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Defense Evasion

          Impair Defenses

          1
          T1562

          Disable or Modify System Firewall

          1
          T1562.004

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\ryfixleo.exe
            Filesize

            11.4MB

            MD5

            c4dd00a1e71944e5b8538686af59ae77

            SHA1

            8bfb9a054fe357c37c8248b45fb70f0902c9ee77

            SHA256

            d42a1ad9d91d2d1dc2fcb78e7a88b018c37fd69f16c5d6fbe1abc20b420b91ee

            SHA512

            fe9ff2ae19745a90e8a508e20e987775d1d9b82e5b1e312e3c40f950ae036e5457cc7eddf5d93d9b3d67ab9b68b543751bc132a582ac9f7a19776ab6cc9fa7e5

          • memory/1860-15-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/1860-1-0x0000000000450000-0x0000000000550000-memory.dmp
            Filesize

            1024KB

          • memory/1860-3-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/1860-2-0x0000000002180000-0x0000000002193000-memory.dmp
            Filesize

            76KB

          • memory/2184-8-0x0000000000480000-0x0000000000580000-memory.dmp
            Filesize

            1024KB

          • memory/2184-12-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/2184-10-0x0000000000D00000-0x0000000000D13000-memory.dmp
            Filesize

            76KB

          • memory/5024-32-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-38-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-17-0x0000000001030000-0x0000000001045000-memory.dmp
            Filesize

            84KB

          • memory/5024-18-0x0000000001030000-0x0000000001045000-memory.dmp
            Filesize

            84KB

          • memory/5024-20-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/5024-23-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/5024-24-0x00000000023E0000-0x00000000023E6000-memory.dmp
            Filesize

            24KB

          • memory/5024-27-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-30-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-31-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-9-0x0000000001030000-0x0000000001045000-memory.dmp
            Filesize

            84KB

          • memory/5024-34-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-33-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-35-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-36-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-14-0x0000000001030000-0x0000000001045000-memory.dmp
            Filesize

            84KB

          • memory/5024-37-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-39-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-40-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-41-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-43-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-44-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-45-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-46-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-42-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/5024-50-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/5024-47-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/5024-51-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/5024-54-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/5024-55-0x00000000031E0000-0x00000000031E7000-memory.dmp
            Filesize

            28KB

          • memory/5024-59-0x0000000001030000-0x0000000001045000-memory.dmp
            Filesize

            84KB