Analysis

  • max time kernel
    115s
  • max time network
    118s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20-12-2024 01:41

General

  • Target

    b31a4fce3073218756ef0c2ebce409288bba3d9dca83a47476cc38316d90a5b8N.exe

  • Size

    320KB

  • MD5

    e0cf01f8e4d92943522cd69b01dcf100

  • SHA1

    e47238b98f51c0384fea167f3054e63c48cee720

  • SHA256

    b31a4fce3073218756ef0c2ebce409288bba3d9dca83a47476cc38316d90a5b8

  • SHA512

    ceb3aa49012c565f3657eb78cc94e2e95a5bce72b8ad361a2e7d2cadcd6ad1869bda22db784034219af80ed9e9cd09268f938c1049fd26b34a288b66c3a899ba

  • SSDEEP

    6144:08FOumLCE/jANU0VSaimnpnv9/2Hh5Sao2JUjJUrecECM:08FdmOE/y7QaimlF2UR2JMJUrq

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.

  • Tofsee family
  • 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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b31a4fce3073218756ef0c2ebce409288bba3d9dca83a47476cc38316d90a5b8N.exe
    "C:\Users\Admin\AppData\Local\Temp\b31a4fce3073218756ef0c2ebce409288bba3d9dca83a47476cc38316d90a5b8N.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3700
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vvwroxvs\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4384
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gdtjziov.exe" C:\Windows\SysWOW64\vvwroxvs\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4636
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create vvwroxvs binPath= "C:\Windows\SysWOW64\vvwroxvs\gdtjziov.exe /d\"C:\Users\Admin\AppData\Local\Temp\b31a4fce3073218756ef0c2ebce409288bba3d9dca83a47476cc38316d90a5b8N.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1128
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description vvwroxvs "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2040
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start vvwroxvs
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4796
    • 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:4240
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3700 -s 1280
      2⤵
      • Program crash
      PID:5032
  • C:\Windows\SysWOW64\vvwroxvs\gdtjziov.exe
    C:\Windows\SysWOW64\vvwroxvs\gdtjziov.exe /d"C:\Users\Admin\AppData\Local\Temp\b31a4fce3073218756ef0c2ebce409288bba3d9dca83a47476cc38316d90a5b8N.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4112
    • 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:2056
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4112 -s 508
      2⤵
      • Program crash
      PID:1984
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 3700 -ip 3700
    1⤵
      PID:1564
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 356 -p 4112 -ip 4112
      1⤵
        PID:3428

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.0MB

        MD5

        7d52505978f695d686ccc2231c72c905

        SHA1

        70823c93b96e9f84bb62f64749ee789898203b27

        SHA256

        4748ca06ff376ffda387b48e89913e59583343ba21d086791a1e14714e018596

        SHA512

        bf4991fb509ffe0faff5644a56d1576ad3e9aea803854fc85cab744f921f1ff8457e991c303e64a5cc2e3315bc1f78bf6939316ac60b6480fbbce082b309e29b

      • memory/2056-37-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-32-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-24-0x0000000000580000-0x0000000000586000-memory.dmp

        Filesize

        24KB

      • memory/2056-27-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-23-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/2056-30-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-47-0x00000000019E0000-0x00000000019E5000-memory.dmp

        Filesize

        20KB

      • memory/2056-31-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-46-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-33-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-13-0x00000000004C0000-0x00000000004D5000-memory.dmp

        Filesize

        84KB

      • memory/2056-15-0x00000000004C0000-0x00000000004D5000-memory.dmp

        Filesize

        84KB

      • memory/2056-16-0x00000000004C0000-0x00000000004D5000-memory.dmp

        Filesize

        84KB

      • memory/2056-34-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-20-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/2056-51-0x0000000007100000-0x000000000750B000-memory.dmp

        Filesize

        4.0MB

      • memory/2056-55-0x00000000019F0000-0x00000000019F7000-memory.dmp

        Filesize

        28KB

      • memory/2056-45-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-35-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-36-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-50-0x00000000019E0000-0x00000000019E5000-memory.dmp

        Filesize

        20KB

      • memory/2056-44-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-43-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-54-0x0000000007100000-0x000000000750B000-memory.dmp

        Filesize

        4.0MB

      • memory/2056-42-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-41-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-40-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-39-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/2056-38-0x0000000001990000-0x00000000019A0000-memory.dmp

        Filesize

        64KB

      • memory/3700-0-0x00000000001C0000-0x00000000001EB000-memory.dmp

        Filesize

        172KB

      • memory/3700-2-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3700-6-0x0000000000400000-0x0000000000457000-memory.dmp

        Filesize

        348KB

      • memory/3700-7-0x00000000001C0000-0x00000000001EB000-memory.dmp

        Filesize

        172KB

      • memory/3700-8-0x00000000004D0000-0x00000000004E3000-memory.dmp

        Filesize

        76KB

      • memory/3700-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3700-1-0x00000000004D0000-0x00000000004E3000-memory.dmp

        Filesize

        76KB

      • memory/4112-18-0x0000000000400000-0x0000000000457000-memory.dmp

        Filesize

        348KB

      • memory/4112-12-0x0000000000400000-0x0000000000457000-memory.dmp

        Filesize

        348KB

      • memory/4112-11-0x0000000000400000-0x0000000000457000-memory.dmp

        Filesize

        348KB

      • memory/4112-10-0x0000000000400000-0x0000000000457000-memory.dmp

        Filesize

        348KB