Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-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
  • 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).

  • 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 6 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⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5088
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ozogjjc\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2396
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wldkpnsk.exe" C:\Windows\SysWOW64\ozogjjc\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1536
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ozogjjc binPath= "C:\Windows\SysWOW64\ozogjjc\wldkpnsk.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:316
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ozogjjc "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3056
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ozogjjc
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1144
    • 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:4724
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5088 -s 1036
      2⤵
      • Program crash
      PID:4108
  • C:\Windows\SysWOW64\ozogjjc\wldkpnsk.exe
    C:\Windows\SysWOW64\ozogjjc\wldkpnsk.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:3084
    • 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:2284
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3084 -s 512
      2⤵
      • Program crash
      PID:4668
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 5088 -ip 5088
    1⤵
      PID:1764
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 3084 -ip 3084
      1⤵
        PID:3644

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        12.9MB

        MD5

        e75204d2dff1ba22f4df7ed5ecd3e848

        SHA1

        d81acc200d983fe81dce2edb41c4c58f05f75d58

        SHA256

        dcd8de24dfd796e1f369b3fea25e81e5be8b90bb897a6e495c95f5ff47e67646

        SHA512

        0fc8dc6bbe6f79ea03ad1713980b09d60a009d61d209d44ce7f196cca73ea77d16fd14133bc8eea983cb73a1e539ef2cd1f7a04a9eaf6e050591b626abd2a9f2

      • memory/2284-54-0x0000000007940000-0x0000000007D4B000-memory.dmp

        Filesize

        4.0MB

      • memory/2284-31-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-27-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-30-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-32-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-33-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-34-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-35-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-36-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-14-0x0000000000B50000-0x0000000000B65000-memory.dmp

        Filesize

        84KB

      • memory/2284-16-0x0000000000B50000-0x0000000000B65000-memory.dmp

        Filesize

        84KB

      • memory/2284-17-0x0000000000B50000-0x0000000000B65000-memory.dmp

        Filesize

        84KB

      • memory/2284-37-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-55-0x00000000021F0000-0x00000000021F7000-memory.dmp

        Filesize

        28KB

      • memory/2284-21-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/2284-39-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-38-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-25-0x0000000000FE0000-0x0000000000FE6000-memory.dmp

        Filesize

        24KB

      • memory/2284-40-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/2284-46-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-50-0x00000000021E0000-0x00000000021E5000-memory.dmp

        Filesize

        20KB

      • memory/2284-47-0x00000000021E0000-0x00000000021E5000-memory.dmp

        Filesize

        20KB

      • memory/2284-51-0x0000000007940000-0x0000000007D4B000-memory.dmp

        Filesize

        4.0MB

      • memory/2284-45-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-44-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-43-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-42-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/2284-41-0x0000000000FF0000-0x0000000001000000-memory.dmp

        Filesize

        64KB

      • memory/3084-18-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/3084-12-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/3084-13-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/3084-11-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/5088-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/5088-1-0x0000000000780000-0x0000000000880000-memory.dmp

        Filesize

        1024KB

      • memory/5088-8-0x0000000000750000-0x0000000000763000-memory.dmp

        Filesize

        76KB

      • memory/5088-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/5088-7-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/5088-2-0x0000000000750000-0x0000000000763000-memory.dmp

        Filesize

        76KB