Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    05/09/2024, 09:56

General

  • Target

    537afa11519e38a93a1270a859040f804ab2c894d451d58d80c7e497b78549fe.exe

  • Size

    400KB

  • MD5

    56bcd07602b26cd5c6224dd22bb26b7c

  • SHA1

    c7bd8d8c02a310beaf6abd1c58edaa9d02b5f2a2

  • SHA256

    537afa11519e38a93a1270a859040f804ab2c894d451d58d80c7e497b78549fe

  • SHA512

    a3eb4d77155f9d9533e7969ea737c537776e108e7d943269d21fcc6dc63a58e46d13135549c659d86a6de9123f8add18c49beee14c470b7c57ef3646bef57b7b

  • SSDEEP

    6144:mPAbuY32ftPCe4n79+JtUKzBqddIs00jUS0l/g5VfcA:mcuY32ftPCb79KAUs00j10lWVf

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) 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.

  • Program crash 2 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\537afa11519e38a93a1270a859040f804ab2c894d451d58d80c7e497b78549fe.exe
    "C:\Users\Admin\AppData\Local\Temp\537afa11519e38a93a1270a859040f804ab2c894d451d58d80c7e497b78549fe.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5432
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uwkffapl\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4560
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\knkduwqg.exe" C:\Windows\SysWOW64\uwkffapl\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5996
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create uwkffapl binPath= "C:\Windows\SysWOW64\uwkffapl\knkduwqg.exe /d\"C:\Users\Admin\AppData\Local\Temp\537afa11519e38a93a1270a859040f804ab2c894d451d58d80c7e497b78549fe.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5912
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description uwkffapl "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3484
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start uwkffapl
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5376
    • 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
      • System Location Discovery: System Language Discovery
      PID:2844
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5432 -s 672
      2⤵
      • Program crash
      PID:1716
  • C:\Windows\SysWOW64\uwkffapl\knkduwqg.exe
    C:\Windows\SysWOW64\uwkffapl\knkduwqg.exe /d"C:\Users\Admin\AppData\Local\Temp\537afa11519e38a93a1270a859040f804ab2c894d451d58d80c7e497b78549fe.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3100
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:1980
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3100 -s 540
      2⤵
      • Program crash
      PID:4664
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 5432 -ip 5432
    1⤵
      PID:4272
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 3100 -ip 3100
      1⤵
        PID:5796

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        14.0MB

        MD5

        e8e9ace6efdad5c0f3fb7f7f40b00de7

        SHA1

        736b4b197ece8a90629d033cc35d19bc91226bb7

        SHA256

        78250f3ad0a0099249c53f703d7a0a11ae882f13a42775d84bc04e495a53eb6d

        SHA512

        260e46d0918d47c70ca70f40bccbeb1666f6e7534f1816f23949ababdc48f36d1743971a6e6517a31250a51f0710039299a504861054e1b66faab8e44444f67d

      • memory/1980-38-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-39-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-26-0x00000000005F0000-0x00000000005F6000-memory.dmp

        Filesize

        24KB

      • memory/1980-32-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-42-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-25-0x0000000002000000-0x000000000220F000-memory.dmp

        Filesize

        2.1MB

      • memory/1980-29-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-33-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-12-0x00000000001A0000-0x00000000001B5000-memory.dmp

        Filesize

        84KB

      • memory/1980-34-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-35-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-36-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-19-0x00000000001A0000-0x00000000001B5000-memory.dmp

        Filesize

        84KB

      • memory/1980-20-0x00000000001A0000-0x00000000001B5000-memory.dmp

        Filesize

        84KB

      • memory/1980-49-0x00000000025D0000-0x00000000025D5000-memory.dmp

        Filesize

        20KB

      • memory/1980-56-0x0000000007040000-0x000000000744B000-memory.dmp

        Filesize

        4.0MB

      • memory/1980-57-0x00000000025E0000-0x00000000025E7000-memory.dmp

        Filesize

        28KB

      • memory/1980-53-0x0000000007040000-0x000000000744B000-memory.dmp

        Filesize

        4.0MB

      • memory/1980-37-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-23-0x0000000002000000-0x000000000220F000-memory.dmp

        Filesize

        2.1MB

      • memory/1980-43-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-47-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-46-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-45-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-44-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-48-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-41-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-40-0x0000000000CE0000-0x0000000000CF0000-memory.dmp

        Filesize

        64KB

      • memory/1980-52-0x00000000025D0000-0x00000000025D5000-memory.dmp

        Filesize

        20KB

      • memory/3100-9-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/3100-10-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/3100-18-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/3100-8-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/5432-2-0x0000000002450000-0x0000000002463000-memory.dmp

        Filesize

        76KB

      • memory/5432-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/5432-14-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/5432-16-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/5432-15-0x0000000002450000-0x0000000002463000-memory.dmp

        Filesize

        76KB

      • memory/5432-11-0x0000000000970000-0x0000000000A70000-memory.dmp

        Filesize

        1024KB

      • memory/5432-1-0x0000000000970000-0x0000000000A70000-memory.dmp

        Filesize

        1024KB