Analysis

  • max time kernel
    144s
  • max time network
    155s
  • platform
    windows7_x64
  • resource
    win7-20240705-en
  • resource tags

    arch:x64arch:x86image:win7-20240705-enlocale:en-usos:windows7-x64system
  • submitted
    09-07-2024 02:10

General

  • Target

    c20fa0ab6b79f5d972c8ce22fa9c52b1.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\c20fa0ab6b79f5d972c8ce22fa9c52b1.exe
    "C:\Users\Admin\AppData\Local\Temp\c20fa0ab6b79f5d972c8ce22fa9c52b1.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1040
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rtvjnafp\
      2⤵
        PID:2432
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sbhsqfx.exe" C:\Windows\SysWOW64\rtvjnafp\
        2⤵
          PID:1692
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rtvjnafp binPath= "C:\Windows\SysWOW64\rtvjnafp\sbhsqfx.exe /d\"C:\Users\Admin\AppData\Local\Temp\c20fa0ab6b79f5d972c8ce22fa9c52b1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1732
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rtvjnafp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1060
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rtvjnafp
          2⤵
          • Launches sc.exe
          PID:2780
        • 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:3024
      • C:\Windows\SysWOW64\rtvjnafp\sbhsqfx.exe
        C:\Windows\SysWOW64\rtvjnafp\sbhsqfx.exe /d"C:\Users\Admin\AppData\Local\Temp\c20fa0ab6b79f5d972c8ce22fa9c52b1.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2896
        • 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:2364

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        14.6MB

        MD5

        81797f0f07ada62bbbf6f8e4089f0eaf

        SHA1

        03d8bedfa20a33916231dc38227c149b33b13e34

        SHA256

        1d5cbec65031ff5cf758ad41e21b9d7fe511853a80a725f24345d39ff50bf4d9

        SHA512

        6e0ffea7b1956c7e1d5ae4e5221018ef9cc4d3c654c59aade479a4324812c2bdafd41671cd1873cee2b10d66aa1f40c5ede154155c01f83036a3663dcb55384a

      • memory/1040-1-0x0000000000540000-0x0000000000640000-memory.dmp
        Filesize

        1024KB

      • memory/1040-2-0x00000000002A0000-0x00000000002B3000-memory.dmp
        Filesize

        76KB

      • memory/1040-3-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/1040-9-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/1040-8-0x00000000002A0000-0x00000000002B3000-memory.dmp
        Filesize

        76KB

      • memory/1040-7-0x0000000000400000-0x00000000004C4000-memory.dmp
        Filesize

        784KB

      • memory/2364-47-0x0000000000310000-0x0000000000315000-memory.dmp
        Filesize

        20KB

      • memory/2364-44-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2364-11-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2364-16-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2364-17-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2364-18-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2364-20-0x00000000018D0000-0x0000000001ADF000-memory.dmp
        Filesize

        2.1MB

      • memory/2364-27-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-24-0x00000000001F0000-0x00000000001F6000-memory.dmp
        Filesize

        24KB

      • memory/2364-23-0x00000000018D0000-0x0000000001ADF000-memory.dmp
        Filesize

        2.1MB

      • memory/2364-30-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-50-0x0000000000310000-0x0000000000315000-memory.dmp
        Filesize

        20KB

      • memory/2364-14-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2364-46-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-51-0x0000000005510000-0x000000000591B000-memory.dmp
        Filesize

        4.0MB

      • memory/2364-45-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-31-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-43-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-42-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-41-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-54-0x0000000005510000-0x000000000591B000-memory.dmp
        Filesize

        4.0MB

      • memory/2364-55-0x0000000000460000-0x0000000000467000-memory.dmp
        Filesize

        28KB

      • memory/2364-40-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-39-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-38-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-37-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-36-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-35-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-34-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-33-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2364-32-0x0000000000300000-0x0000000000310000-memory.dmp
        Filesize

        64KB

      • memory/2896-15-0x0000000000400000-0x00000000004C4000-memory.dmp
        Filesize

        784KB