Analysis

  • max time kernel
    147s
  • 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

    8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe

  • Size

    203KB

  • MD5

    6b7204c0cb219b7d01999025ccd85fdc

  • SHA1

    1f57fbfdcf6d71d0d5a36602e1e83bc9dee3ac7a

  • SHA256

    8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40

  • SHA512

    68a19f84eb4d73394a2bb2b7629f9582e91b54713b19e71722ba5359636ce36d9aa9951af7b729d65752a7aff916ee91abd87f34c2e4aad43cebef777800742b

  • SSDEEP

    3072:eSf/dfuraZJXENc8uCXJiXK1K2LS1G2B+vioyUSdUuD5BBNcRrxOJ+cmH:eSf/MQ15t1TB+PSHexLco

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\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe
    "C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1948
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wuzbhmbt\
      2⤵
        PID:2516
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vlhwrjhp.exe" C:\Windows\SysWOW64\wuzbhmbt\
        2⤵
          PID:3316
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wuzbhmbt binPath= "C:\Windows\SysWOW64\wuzbhmbt\vlhwrjhp.exe /d\"C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1032
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wuzbhmbt "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1240
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wuzbhmbt
          2⤵
          • Launches sc.exe
          PID:1108
        • 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:3856
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1948 -s 1040
          2⤵
          • Program crash
          PID:3548
      • C:\Windows\SysWOW64\wuzbhmbt\vlhwrjhp.exe
        C:\Windows\SysWOW64\wuzbhmbt\vlhwrjhp.exe /d"C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1704
        • 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:3132
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1704 -s 524
          2⤵
          • Program crash
          PID:4508
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 1948 -ip 1948
        1⤵
          PID:3956
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 1704 -ip 1704
          1⤵
            PID:2724

          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\vlhwrjhp.exe
            Filesize

            14.6MB

            MD5

            da1cf6784d983b8d9045cab09c567b64

            SHA1

            f2542d550d6e8075cc27e1367adc74710ddd6ffe

            SHA256

            fd1e77ab44d6df433a69cf9810cf908a4fddac7c886e0aad7f52915fa8d897b1

            SHA512

            f2af7901a2fa9cfa31cacc7c531dcf61c1f3a0df907f39102ef1783da98726b6732d1ac9df1313d320a756ae9a1108d9bc94922199b58bf00fa461d247961529

          • memory/1704-8-0x0000000000490000-0x0000000000590000-memory.dmp
            Filesize

            1024KB

          • memory/1704-9-0x00000000005C0000-0x00000000005D3000-memory.dmp
            Filesize

            76KB

          • memory/1704-10-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/1704-16-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/1948-15-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/1948-2-0x0000000002180000-0x0000000002193000-memory.dmp
            Filesize

            76KB

          • memory/1948-3-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/1948-1-0x0000000000670000-0x0000000000770000-memory.dmp
            Filesize

            1024KB

          • memory/3132-51-0x0000000007550000-0x000000000795B000-memory.dmp
            Filesize

            4.0MB

          • memory/3132-55-0x0000000007AA0000-0x0000000007AA7000-memory.dmp
            Filesize

            28KB

          • memory/3132-17-0x0000000000830000-0x0000000000845000-memory.dmp
            Filesize

            84KB

          • memory/3132-18-0x0000000000830000-0x0000000000845000-memory.dmp
            Filesize

            84KB

          • memory/3132-20-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/3132-23-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/3132-24-0x00000000009C0000-0x00000000009C6000-memory.dmp
            Filesize

            24KB

          • memory/3132-27-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-34-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-33-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-46-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-11-0x0000000000830000-0x0000000000845000-memory.dmp
            Filesize

            84KB

          • memory/3132-50-0x0000000007400000-0x0000000007405000-memory.dmp
            Filesize

            20KB

          • memory/3132-47-0x0000000007400000-0x0000000007405000-memory.dmp
            Filesize

            20KB

          • memory/3132-45-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-14-0x0000000000830000-0x0000000000845000-memory.dmp
            Filesize

            84KB

          • memory/3132-54-0x0000000007550000-0x000000000795B000-memory.dmp
            Filesize

            4.0MB

          • memory/3132-44-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-43-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-42-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-41-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-40-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-39-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-37-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-38-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-36-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-35-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-32-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-31-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-30-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/3132-59-0x0000000000830000-0x0000000000845000-memory.dmp
            Filesize

            84KB