Analysis

  • max time kernel
    145s
  • max time network
    119s
  • platform
    windows7_x64
  • resource
    win7-20240220-en
  • resource tags

    arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:33

General

  • Target

    648bec40870a8c3abce34fcf5924fcdb02601d7b5561aca406808649ff164a6d.exe

  • Size

    228KB

  • MD5

    aaa0a9ec9406d0974aad08aa5a36927a

  • SHA1

    dfef2eaa4d1b0db6711e0fd83b368eedc7aee3ff

  • SHA256

    648bec40870a8c3abce34fcf5924fcdb02601d7b5561aca406808649ff164a6d

  • SHA512

    e649a25fc6c77a3efbe2c258f28b853bbe65d362f375f5e64841f51b9ee8f6d1bb3fe3f3d7c3d95c9b7afd48e66ec318b5eb6a07a37f13c1cf3465855639eb08

  • SSDEEP

    3072:R4FLaaaoeUUG4JiE/Tt+/uFQEgytIFoNtaX9jFaTJJrnOMO2ktcqDXGI2RQ9lV7o:SFLav/Gs/XgyCFo/aX9OhnX8JV0

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • 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).

  • Modifies data under HKEY_USERS 3 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\648bec40870a8c3abce34fcf5924fcdb02601d7b5561aca406808649ff164a6d.exe
    "C:\Users\Admin\AppData\Local\Temp\648bec40870a8c3abce34fcf5924fcdb02601d7b5561aca406808649ff164a6d.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2316
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cfvyowzq\
      2⤵
        PID:3024
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zplavnlt.exe" C:\Windows\SysWOW64\cfvyowzq\
        2⤵
          PID:2660
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cfvyowzq binPath= "C:\Windows\SysWOW64\cfvyowzq\zplavnlt.exe /d\"C:\Users\Admin\AppData\Local\Temp\648bec40870a8c3abce34fcf5924fcdb02601d7b5561aca406808649ff164a6d.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2568
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cfvyowzq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2988
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cfvyowzq
          2⤵
          • Launches sc.exe
          PID:2652
        • 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:2444
      • C:\Windows\SysWOW64\cfvyowzq\zplavnlt.exe
        C:\Windows\SysWOW64\cfvyowzq\zplavnlt.exe /d"C:\Users\Admin\AppData\Local\Temp\648bec40870a8c3abce34fcf5924fcdb02601d7b5561aca406808649ff164a6d.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2776
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2432

      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

      2
      T1562

      Disable or Modify Tools

      1
      T1562.001

      Disable or Modify System Firewall

      1
      T1562.004

      Modify Registry

      2
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        12.7MB

        MD5

        12e07eb83f70dc72f6c9e90f8c5d74d1

        SHA1

        41a20bb9e392ddb9734edad22871eaabad87c124

        SHA256

        4f295ed2f32aad8678b6cf95c983c076739d056e7094afa7ebce543953741b87

        SHA512

        ec181106b12a5bfd7cad36491f0258f9aafa7aea1d8a8650c864a06cdc1678f59d9a88a37e6ba5f39f2cc043553d441c5d171f0bf77bc5570958b9a293f272e7

      • memory/2316-3-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/2316-4-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2316-1-0x00000000004D0000-0x00000000005D0000-memory.dmp
        Filesize

        1024KB

      • memory/2316-7-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2432-14-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2432-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2432-11-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2432-18-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2432-19-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2432-21-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2776-10-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2776-15-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2776-9-0x00000000002D0000-0x00000000003D0000-memory.dmp
        Filesize

        1024KB