Analysis

  • max time kernel
    146s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:32

General

  • Target

    f6c76564b0268b7c3b754b05e498fcbc7e11fc1907460d12b1d55dd0d0662834.exe

  • Size

    291KB

  • MD5

    66ebc32e8c190f890b24ccdac2e9a428

  • SHA1

    5c3f23e69bfe7dc42c6a25bb670357a18c8455c7

  • SHA256

    f6c76564b0268b7c3b754b05e498fcbc7e11fc1907460d12b1d55dd0d0662834

  • SHA512

    7c7ef99016cd154d649f6fd0de6457d43a3e2e6e52735306c9be7ddaa9eb9f7d0110cfbf839eaf4b56c7c57db92ebe1653abae569a9b3d6f38c83fc2b5b13142

  • SSDEEP

    3072:GDq1IwpTDlRRfAIiLGFJuQIjn5KK8PNUX558:wpwT3RfEJ3sZKA

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 7 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f6c76564b0268b7c3b754b05e498fcbc7e11fc1907460d12b1d55dd0d0662834.exe
    "C:\Users\Admin\AppData\Local\Temp\f6c76564b0268b7c3b754b05e498fcbc7e11fc1907460d12b1d55dd0d0662834.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:756
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xzgjyslm\
      2⤵
        PID:1636
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xrwupspr.exe" C:\Windows\SysWOW64\xzgjyslm\
        2⤵
          PID:960
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create xzgjyslm binPath= "C:\Windows\SysWOW64\xzgjyslm\xrwupspr.exe /d\"C:\Users\Admin\AppData\Local\Temp\f6c76564b0268b7c3b754b05e498fcbc7e11fc1907460d12b1d55dd0d0662834.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2732
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description xzgjyslm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2592
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start xzgjyslm
          2⤵
          • Launches sc.exe
          PID:2672
        • 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:2576
      • C:\Windows\SysWOW64\xzgjyslm\xrwupspr.exe
        C:\Windows\SysWOW64\xzgjyslm\xrwupspr.exe /d"C:\Users\Admin\AppData\Local\Temp\f6c76564b0268b7c3b754b05e498fcbc7e11fc1907460d12b1d55dd0d0662834.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2604
        • 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:2612

      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\xrwupspr.exe
        Filesize

        12.3MB

        MD5

        47233bbb9b763cb03d6c45d7c4a6b4ad

        SHA1

        50b9a3d0d63b856a8d90388b2a9229c68b4a697c

        SHA256

        c35cbd078f9f0dd931db314cf1f7d68c9ec506af08f4782c409a0baedc36f1c7

        SHA512

        8ce4927d772c566dc028ae907d0e6dd554045b45e331e0efe027ba720130e31e7d2966359a8ace5d7b6c3d87764d5088364299a566ad29b6be83004c9e31dc7c

      • memory/756-3-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/756-4-0x0000000000400000-0x0000000002ABF000-memory.dmp
        Filesize

        38.7MB

      • memory/756-7-0x0000000000400000-0x0000000002ABF000-memory.dmp
        Filesize

        38.7MB

      • memory/756-1-0x0000000002C10000-0x0000000002D10000-memory.dmp
        Filesize

        1024KB

      • memory/2604-16-0x0000000000400000-0x0000000002ABF000-memory.dmp
        Filesize

        38.7MB

      • memory/2604-9-0x0000000002B30000-0x0000000002C30000-memory.dmp
        Filesize

        1024KB

      • memory/2604-17-0x0000000000400000-0x0000000002ABF000-memory.dmp
        Filesize

        38.7MB

      • memory/2612-34-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-39-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-19-0x0000000000110000-0x0000000000125000-memory.dmp
        Filesize

        84KB

      • memory/2612-18-0x0000000000110000-0x0000000000125000-memory.dmp
        Filesize

        84KB

      • memory/2612-10-0x0000000000110000-0x0000000000125000-memory.dmp
        Filesize

        84KB

      • memory/2612-20-0x0000000000110000-0x0000000000125000-memory.dmp
        Filesize

        84KB

      • memory/2612-22-0x0000000001960000-0x0000000001B6F000-memory.dmp
        Filesize

        2.1MB

      • memory/2612-25-0x0000000001960000-0x0000000001B6F000-memory.dmp
        Filesize

        2.1MB

      • memory/2612-26-0x00000000000C0000-0x00000000000C6000-memory.dmp
        Filesize

        24KB

      • memory/2612-29-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-32-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-33-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2612-35-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-36-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-37-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-38-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-13-0x0000000000110000-0x0000000000125000-memory.dmp
        Filesize

        84KB

      • memory/2612-40-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-41-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-42-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-43-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-44-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-45-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-46-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-47-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-48-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2612-49-0x0000000000140000-0x0000000000145000-memory.dmp
        Filesize

        20KB

      • memory/2612-52-0x0000000000140000-0x0000000000145000-memory.dmp
        Filesize

        20KB

      • memory/2612-53-0x0000000005510000-0x000000000591B000-memory.dmp
        Filesize

        4.0MB

      • memory/2612-57-0x00000000004B0000-0x00000000004B7000-memory.dmp
        Filesize

        28KB

      • memory/2612-56-0x0000000005510000-0x000000000591B000-memory.dmp
        Filesize

        4.0MB

      • memory/2612-61-0x0000000000110000-0x0000000000125000-memory.dmp
        Filesize

        84KB