Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 12:58

General

  • Target

    6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe

  • Size

    170KB

  • MD5

    f5fd4237e550503a8eab51ae35f147b6

  • SHA1

    869d44d58fb734b3692500dae1f42f0d6e3b3434

  • SHA256

    6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd

  • SHA512

    32327ca44e09d46ba8e656124f7480979b3eeb3769a94259d536a5223b2c532bd21654d8b4551d26265903f5c2be87a8da73d4571eee6fd9bfc887ea9e88350f

  • SSDEEP

    1536:Js5KSNeteSXSI4nZ7OyP8p7+C1xIhQ6M3dfUMJn325pDedDT50ZXXKVXRKX:e5ScSHCO1p7hiO4AI1edHK56lR

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.

  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe
    "C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3296
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\widnnybp\
      2⤵
        PID:2052
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bzjkmilr.exe" C:\Windows\SysWOW64\widnnybp\
        2⤵
          PID:784
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create widnnybp binPath= "C:\Windows\SysWOW64\widnnybp\bzjkmilr.exe /d\"C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4444
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description widnnybp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:412
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start widnnybp
          2⤵
          • Launches sc.exe
          PID:2700
        • 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:464
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3296 -s 1192
          2⤵
          • Program crash
          PID:2852
      • C:\Windows\SysWOW64\widnnybp\bzjkmilr.exe
        C:\Windows\SysWOW64\widnnybp\bzjkmilr.exe /d"C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3792
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:736
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3792 -s 516
          2⤵
          • Program crash
          PID:4024
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 3296 -ip 3296
        1⤵
          PID:1512
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 3792 -ip 3792
          1⤵
            PID:2544

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\bzjkmilr.exe

            Filesize

            10.4MB

            MD5

            cd7d2166e0716e9550a53ef3290e6a85

            SHA1

            7076bbc41ae902cf30d445c3b3aa136e9e3fe03f

            SHA256

            23ce07ce255c42bffb998c9787f190c936ff2da744107078b03d0515b0e8d27e

            SHA512

            cf22bccc7b94cd78263fd8349b16eccc9432cff5a2923637092ea292eb600968fa9a52bf46708b89103b218e165509de52f6d56c0a7839448c9c101e4f72bbde

          • memory/736-31-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-43-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-59-0x0000000000CB0000-0x0000000000CC5000-memory.dmp

            Filesize

            84KB

          • memory/736-33-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-54-0x0000000008040000-0x000000000844B000-memory.dmp

            Filesize

            4.0MB

          • memory/736-34-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-39-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-12-0x0000000000CB0000-0x0000000000CC5000-memory.dmp

            Filesize

            84KB

          • memory/736-15-0x0000000000CB0000-0x0000000000CC5000-memory.dmp

            Filesize

            84KB

          • memory/736-16-0x0000000000CB0000-0x0000000000CC5000-memory.dmp

            Filesize

            84KB

          • memory/736-41-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-18-0x0000000000CB0000-0x0000000000CC5000-memory.dmp

            Filesize

            84KB

          • memory/736-20-0x0000000002A00000-0x0000000002C0F000-memory.dmp

            Filesize

            2.1MB

          • memory/736-36-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-24-0x0000000002160000-0x0000000002166000-memory.dmp

            Filesize

            24KB

          • memory/736-27-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-32-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-30-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-55-0x00000000021F0000-0x00000000021F7000-memory.dmp

            Filesize

            28KB

          • memory/736-40-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp

            Filesize

            2.1MB

          • memory/736-35-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-38-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-37-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-47-0x00000000021E0000-0x00000000021E5000-memory.dmp

            Filesize

            20KB

          • memory/736-46-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-45-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-44-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-42-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/736-51-0x0000000008040000-0x000000000844B000-memory.dmp

            Filesize

            4.0MB

          • memory/736-50-0x00000000021E0000-0x00000000021E5000-memory.dmp

            Filesize

            20KB

          • memory/3296-4-0x0000000000400000-0x0000000000474000-memory.dmp

            Filesize

            464KB

          • memory/3296-2-0x0000000000480000-0x0000000000493000-memory.dmp

            Filesize

            76KB

          • memory/3296-8-0x0000000000480000-0x0000000000493000-memory.dmp

            Filesize

            76KB

          • memory/3296-7-0x0000000000400000-0x0000000000474000-memory.dmp

            Filesize

            464KB

          • memory/3296-1-0x00000000004B0000-0x00000000005B0000-memory.dmp

            Filesize

            1024KB

          • memory/3792-17-0x0000000000400000-0x0000000000474000-memory.dmp

            Filesize

            464KB

          • memory/3792-11-0x0000000000400000-0x0000000000474000-memory.dmp

            Filesize

            464KB

          • memory/3792-10-0x00000000007F0000-0x00000000008F0000-memory.dmp

            Filesize

            1024KB