Analysis

  • max time kernel
    149s
  • max time network
    150s
  • 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, 10:27

General

  • Target

    36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe

  • Size

    399KB

  • MD5

    05b66bfebe0f44b1eb15ede797adbecd

  • SHA1

    6a9227f4cdc2cd60f594ccf4a265a39bea7bdeab

  • SHA256

    36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1

  • SHA512

    1cae3a1419d42c0b131e475549731d4e37cb64e9e945451308bca32f1667ef4621ab8aeaf794f66b6a9e510c1368aa6fafdd52c6dd618e2afddaff043c877517

  • SSDEEP

    6144:0Epz3ZfyHfWBmYALwRzU3EHHxdzJF0PwVFdgiR4i/OP3A:0Epz3ZfyHfWB7o3EHRdFFwEOc48

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\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe
    "C:\Users\Admin\AppData\Local\Temp\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1640
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vyhpbzuq\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1684
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cjivddlp.exe" C:\Windows\SysWOW64\vyhpbzuq\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4616
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create vyhpbzuq binPath= "C:\Windows\SysWOW64\vyhpbzuq\cjivddlp.exe /d\"C:\Users\Admin\AppData\Local\Temp\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3172
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description vyhpbzuq "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3548
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start vyhpbzuq
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5076
    • 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:3960
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1640 -s 600
      2⤵
      • Program crash
      PID:2964
  • C:\Windows\SysWOW64\vyhpbzuq\cjivddlp.exe
    C:\Windows\SysWOW64\vyhpbzuq\cjivddlp.exe /d"C:\Users\Admin\AppData\Local\Temp\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4904
    • 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:2412
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4904 -s 564
      2⤵
      • Program crash
      PID:4852
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 1640 -ip 1640
    1⤵
      PID:2056
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 4904 -ip 4904
      1⤵
        PID:2628

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.8MB

        MD5

        836f60077504aa9545d9ee79855cc8d9

        SHA1

        95c21174cffccc3c6b082cceb2646f8e92fc9f7e

        SHA256

        dca7ae98b3b861e930ee9363ce7e2b8c5f69253bcc0c89e22d558fb1443bc013

        SHA512

        367ca54bdc14f50e58b3f386017da02ae825446cf1edbb12aef5d7401b9949549aabd01495d634d737e0c2f30842cea9e0642a84e261e6e1d57a3793f66c8296

      • memory/1640-1-0x00000000008D0000-0x00000000009D0000-memory.dmp

        Filesize

        1024KB

      • memory/1640-2-0x00000000008B0000-0x00000000008C3000-memory.dmp

        Filesize

        76KB

      • memory/1640-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1640-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1640-8-0x00000000008B0000-0x00000000008C3000-memory.dmp

        Filesize

        76KB

      • memory/1640-7-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/2412-38-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-43-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-23-0x0000000002600000-0x000000000280F000-memory.dmp

        Filesize

        2.1MB

      • memory/2412-12-0x0000000000840000-0x0000000000855000-memory.dmp

        Filesize

        84KB

      • memory/2412-18-0x0000000000840000-0x0000000000855000-memory.dmp

        Filesize

        84KB

      • memory/2412-24-0x0000000000BF0000-0x0000000000BF6000-memory.dmp

        Filesize

        24KB

      • memory/2412-21-0x0000000002600000-0x000000000280F000-memory.dmp

        Filesize

        2.1MB

      • memory/2412-55-0x0000000001DF0000-0x0000000001DF7000-memory.dmp

        Filesize

        28KB

      • memory/2412-54-0x0000000007500000-0x000000000790B000-memory.dmp

        Filesize

        4.0MB

      • memory/2412-51-0x0000000007500000-0x000000000790B000-memory.dmp

        Filesize

        4.0MB

      • memory/2412-50-0x0000000001DE0000-0x0000000001DE5000-memory.dmp

        Filesize

        20KB

      • memory/2412-47-0x0000000001DE0000-0x0000000001DE5000-memory.dmp

        Filesize

        20KB

      • memory/2412-46-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-45-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-44-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-15-0x0000000000840000-0x0000000000855000-memory.dmp

        Filesize

        84KB

      • memory/2412-42-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-41-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-40-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-39-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-27-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-37-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-36-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-35-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-34-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-33-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-32-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-31-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/2412-30-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4904-11-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4904-17-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB

      • memory/4904-14-0x0000000000400000-0x00000000005F8000-memory.dmp

        Filesize

        2.0MB