Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240704-en
  • resource tags

    arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
  • submitted
    10-07-2024 01:23

General

  • Target

    3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe

  • Size

    164KB

  • MD5

    c20fa0ab6b79f5d972c8ce22fa9c52b1

  • SHA1

    a4684e4d865d543a2a498f034af4c9d2c1b6261a

  • SHA256

    3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a

  • SHA512

    3ace193785b00978e06d8dc5a7db3872a7e719c2c8b2b2da07ffcdbe3f9a1188962f974b9d2fb1ed4c0e0f93cf33b575ca5d2b27019dab301bb1e21a181e5a94

  • SSDEEP

    3072:++/LImiO24Vvt0JiGcFaw/5uCvZMt/2PE9w:3/LIP63GcRasP

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) 2 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe
    "C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2164
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zeyixysp\
      2⤵
        PID:2748
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cwbzuxuw.exe" C:\Windows\SysWOW64\zeyixysp\
        2⤵
          PID:2936
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create zeyixysp binPath= "C:\Windows\SysWOW64\zeyixysp\cwbzuxuw.exe /d\"C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2220
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description zeyixysp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2568
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start zeyixysp
          2⤵
          • Launches sc.exe
          PID:2508
        • 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
          • Event Triggered Execution: Netsh Helper DLL
          PID:2532
      • C:\Windows\SysWOW64\zeyixysp\cwbzuxuw.exe
        C:\Windows\SysWOW64\zeyixysp\cwbzuxuw.exe /d"C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2644
        • 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:2192

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        12.1MB

        MD5

        91392eeda66f981aab2fb74640c74b30

        SHA1

        0e6af3b3634118a3f436b0885a58f8a84932b1a2

        SHA256

        cc8c654dc36f4dda93c910f4118fcde5f7e38ef0b519b77499dd1544bde939b0

        SHA512

        711746d3f4f04ca99fab3ebe948ece6cbe37c11e2a0004eecbda18d2df95e5afb2ca5a4babfcb37b15c9f59c4cb9290be9646971881cd80c32ac37035c922ff1

      • memory/2164-1-0x00000000002F0000-0x00000000003F0000-memory.dmp
        Filesize

        1024KB

      • memory/2164-2-0x00000000001B0000-0x00000000001C3000-memory.dmp
        Filesize

        76KB

      • memory/2164-4-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/2164-9-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/2164-8-0x00000000001B0000-0x00000000001C3000-memory.dmp
        Filesize

        76KB

      • memory/2164-7-0x0000000000400000-0x00000000004C4000-memory.dmp
        Filesize

        784KB

      • memory/2192-30-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-54-0x0000000005590000-0x000000000599B000-memory.dmp
        Filesize

        4.0MB

      • memory/2192-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2192-11-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2192-17-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2192-18-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2192-20-0x00000000018D0000-0x0000000001ADF000-memory.dmp
        Filesize

        2.1MB

      • memory/2192-27-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-24-0x0000000000150000-0x0000000000156000-memory.dmp
        Filesize

        24KB

      • memory/2192-23-0x00000000018D0000-0x0000000001ADF000-memory.dmp
        Filesize

        2.1MB

      • memory/2192-31-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-35-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-34-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-33-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-32-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-14-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2192-55-0x0000000000280000-0x0000000000287000-memory.dmp
        Filesize

        28KB

      • memory/2192-52-0x0000000005590000-0x000000000599B000-memory.dmp
        Filesize

        4.0MB

      • memory/2192-50-0x0000000000230000-0x0000000000235000-memory.dmp
        Filesize

        20KB

      • memory/2192-47-0x0000000000230000-0x0000000000235000-memory.dmp
        Filesize

        20KB

      • memory/2192-46-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-45-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-44-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-43-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-42-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-41-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-40-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-39-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-38-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-37-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2192-36-0x0000000000220000-0x0000000000230000-memory.dmp
        Filesize

        64KB

      • memory/2644-15-0x0000000000400000-0x00000000004C4000-memory.dmp
        Filesize

        784KB