Analysis

  • max time kernel
    151s
  • max time network
    159s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:33

General

  • Target

    b557b082890ce023270e4291073976f24d7e68b1ab58890bb95b310785142992.exe

  • Size

    229KB

  • MD5

    68502dbaf73be1eca888f78e3b06d55a

  • SHA1

    14654e87e085e07b91535c7e4e8bc5f41ced65e4

  • SHA256

    b557b082890ce023270e4291073976f24d7e68b1ab58890bb95b310785142992

  • SHA512

    d87cad3ac8f7f18cb12e63c9bb6a74f29dabf09d5374c64d51ce7a1b3621fd65e454ecf6ff0d0551b80685117b450abf50494b669ad48d5a9906b44e7364d6cb

  • SSDEEP

    3072:+nBlv1nZAbXsdUs0vEJier1K2x5b2CZ/P20DMb9rAn5M23R8Gj7mkg+cmH:+nBXk1fmK+G0DMb9rA6Gj7mkHco

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 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b557b082890ce023270e4291073976f24d7e68b1ab58890bb95b310785142992.exe
    "C:\Users\Admin\AppData\Local\Temp\b557b082890ce023270e4291073976f24d7e68b1ab58890bb95b310785142992.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2020
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gejzmppx\
      2⤵
        PID:2780
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bzowpfaw.exe" C:\Windows\SysWOW64\gejzmppx\
        2⤵
          PID:2596
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gejzmppx binPath= "C:\Windows\SysWOW64\gejzmppx\bzowpfaw.exe /d\"C:\Users\Admin\AppData\Local\Temp\b557b082890ce023270e4291073976f24d7e68b1ab58890bb95b310785142992.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2980
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gejzmppx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2560
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gejzmppx
          2⤵
          • Launches sc.exe
          PID:2696
        • 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:2440
      • C:\Windows\SysWOW64\gejzmppx\bzowpfaw.exe
        C:\Windows\SysWOW64\gejzmppx\bzowpfaw.exe /d"C:\Users\Admin\AppData\Local\Temp\b557b082890ce023270e4291073976f24d7e68b1ab58890bb95b310785142992.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:2676

      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\bzowpfaw.exe
        Filesize

        13.1MB

        MD5

        c8d0dc730c61dec07abefe260b368d31

        SHA1

        a736c8b95734d9caec8d159f4e1bf10a5a2956e9

        SHA256

        e9ef1a06f2207266db90195efcfea978ed5318242b864648c203c29694b6aa91

        SHA512

        8bfa203e6af8d83c438b3eb0b16481feadad80abcc9ef836cfba978b2d1f7ab799c16cc3208c0703151f29465887d7961ba5c5b22f07657700bc7b810386e67b

      • memory/2020-3-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/2020-4-0x0000000000400000-0x000000000043E000-memory.dmp
        Filesize

        248KB

      • memory/2020-7-0x0000000000400000-0x000000000043E000-memory.dmp
        Filesize

        248KB

      • memory/2020-1-0x0000000000540000-0x0000000000640000-memory.dmp
        Filesize

        1024KB

      • memory/2604-16-0x0000000000400000-0x000000000043E000-memory.dmp
        Filesize

        248KB

      • memory/2604-9-0x0000000000290000-0x0000000000390000-memory.dmp
        Filesize

        1024KB

      • memory/2604-10-0x0000000000400000-0x000000000043E000-memory.dmp
        Filesize

        248KB

      • memory/2676-35-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-38-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-11-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2676-18-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2676-19-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2676-21-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2676-23-0x0000000001C50000-0x0000000001E5F000-memory.dmp
        Filesize

        2.1MB

      • memory/2676-26-0x0000000001C50000-0x0000000001E5F000-memory.dmp
        Filesize

        2.1MB

      • memory/2676-27-0x0000000000120000-0x0000000000126000-memory.dmp
        Filesize

        24KB

      • memory/2676-30-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-33-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-34-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2676-36-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-37-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-14-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2676-39-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-40-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-41-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-42-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-43-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-44-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-45-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-46-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-47-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-48-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-49-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/2676-50-0x0000000000300000-0x0000000000305000-memory.dmp
        Filesize

        20KB

      • memory/2676-53-0x0000000000300000-0x0000000000305000-memory.dmp
        Filesize

        20KB

      • memory/2676-54-0x0000000005800000-0x0000000005C0B000-memory.dmp
        Filesize

        4.0MB

      • memory/2676-57-0x0000000005800000-0x0000000005C0B000-memory.dmp
        Filesize

        4.0MB

      • memory/2676-58-0x0000000000430000-0x0000000000437000-memory.dmp
        Filesize

        28KB