Analysis

  • max time kernel
    149s
  • max time network
    154s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    03-09-2024 16:58

General

  • Target

    knkduwqg.exe

  • Size

    11.8MB

  • MD5

    b32f61c5c47e9473cf4a0ac98e8143c1

  • SHA1

    d6de6d48a87510f4ba641785e56311a4732dcf26

  • SHA256

    2d49ab2f33264eb29d38ab91a7c6dc193a6a0fa65260b0295b1123c18612d7c5

  • SHA512

    cc0cc0499616d0277920597b7beb8ee0b53d99c9e8d8c827c6e2244dc9a98785a848f17368f6991d362f9b6f76cd3a1f7ebcc31e99c34097c458872336ab5c21

  • SSDEEP

    6144:9c6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:91OZDisvwdaxO0PuG1R4CWs

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\knkduwqg.exe
    "C:\Users\Admin\AppData\Local\Temp\knkduwqg.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1504
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xhukktmw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2484
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\laszechz.exe" C:\Windows\SysWOW64\xhukktmw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1444
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create xhukktmw binPath= "C:\Windows\SysWOW64\xhukktmw\laszechz.exe /d\"C:\Users\Admin\AppData\Local\Temp\knkduwqg.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4272
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description xhukktmw "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3064
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start xhukktmw
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4376
    • 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:3640
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1504 -s 624
      2⤵
      • Program crash
      PID:4076
  • C:\Windows\SysWOW64\xhukktmw\laszechz.exe
    C:\Windows\SysWOW64\xhukktmw\laszechz.exe /d"C:\Users\Admin\AppData\Local\Temp\knkduwqg.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:668
    • 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:736
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 668 -s 536
      2⤵
      • Program crash
      PID:4912
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1504 -ip 1504
    1⤵
      PID:3720
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 668 -ip 668
      1⤵
        PID:4360

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        12.0MB

        MD5

        6357ef0204a04f4d854f61740028828e

        SHA1

        08e5a699213dd7cfc13464a39da79a14231ffc4f

        SHA256

        17ec5ceed70576b3bd9272d23adc8b06eb31d6b57876646997f6a2cb2b6dab3d

        SHA512

        027cc8d9df3e8ed1bc383873f09c53b9585ebb7e784da122271d44bfe0545154fd8448606b8680cbc164c94f1464e35e041462fcbcd98706ff0b21cc1a68a5d2

      • memory/668-16-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/668-11-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/668-15-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/736-46-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-42-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-54-0x0000000007180000-0x000000000758B000-memory.dmp

        Filesize

        4.0MB

      • memory/736-12-0x00000000004C0000-0x00000000004D5000-memory.dmp

        Filesize

        84KB

      • memory/736-32-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-43-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-14-0x00000000004C0000-0x00000000004D5000-memory.dmp

        Filesize

        84KB

      • memory/736-23-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/736-17-0x00000000004C0000-0x00000000004D5000-memory.dmp

        Filesize

        84KB

      • memory/736-21-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/736-55-0x00000000019F0000-0x00000000019F7000-memory.dmp

        Filesize

        28KB

      • memory/736-51-0x0000000007180000-0x000000000758B000-memory.dmp

        Filesize

        4.0MB

      • memory/736-50-0x00000000019E0000-0x00000000019E5000-memory.dmp

        Filesize

        20KB

      • memory/736-47-0x00000000019E0000-0x00000000019E5000-memory.dmp

        Filesize

        20KB

      • memory/736-24-0x0000000001940000-0x0000000001946000-memory.dmp

        Filesize

        24KB

      • memory/736-45-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-44-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-27-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-41-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-40-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-39-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-38-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-37-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-36-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-35-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-34-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-33-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-31-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/736-30-0x0000000001950000-0x0000000001960000-memory.dmp

        Filesize

        64KB

      • memory/1504-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1504-1-0x0000000000730000-0x0000000000830000-memory.dmp

        Filesize

        1024KB

      • memory/1504-2-0x0000000002460000-0x0000000002473000-memory.dmp

        Filesize

        76KB

      • memory/1504-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1504-7-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/1504-8-0x0000000002460000-0x0000000002473000-memory.dmp

        Filesize

        76KB