Analysis

  • max time kernel
    144s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240704-en
  • resource tags

    arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
  • submitted
    10-07-2024 16:20

General

  • Target

    3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe

  • Size

    164KB

  • MD5

    c20fa0ab6b79f5d972c8ce22fa9c52b1

  • SHA1

    a4684e4d865d543a2a498f034af4c9d2c1b6261a

  • SHA256

    3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a

  • SHA512

    3ace193785b00978e06d8dc5a7db3872a7e719c2c8b2b2da07ffcdbe3f9a1188962f974b9d2fb1ed4c0e0f93cf33b575ca5d2b27019dab301bb1e21a181e5a94

  • SSDEEP

    3072:++/LImiO24Vvt0JiGcFaw/5uCvZMt/2PE9w:3/LIP63GcRasP

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • 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.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe
    "C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1668
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dcqaxtyt\
      2⤵
        PID:1604
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\keewzjnz.exe" C:\Windows\SysWOW64\dcqaxtyt\
        2⤵
          PID:1288
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dcqaxtyt binPath= "C:\Windows\SysWOW64\dcqaxtyt\keewzjnz.exe /d\"C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1696
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dcqaxtyt "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1440
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dcqaxtyt
          2⤵
          • Launches sc.exe
          PID:1852
        • 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
          PID:2860
      • C:\Windows\SysWOW64\dcqaxtyt\keewzjnz.exe
        C:\Windows\SysWOW64\dcqaxtyt\keewzjnz.exe /d"C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2796
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2852

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\keewzjnz.exe
        Filesize

        11.1MB

        MD5

        2b84630a00a3deb8cb543544355aae65

        SHA1

        b3a198cea5ba8520f645b1c2ae3990c6b86ae374

        SHA256

        ed6b931c664064ec2e58e0b9c9af28f6e1532f08142cb1e8adcce763720d359e

        SHA512

        978ae7796dd9e075bbf565a51f360be9b25b0b95c25ab2d7391298da3553bc2907243e90f235c8fa3ae86eb9d9aebce14d7f6026940b57449a85b131cfa4fd9e

      • memory/1668-2-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/1668-1-0x0000000000640000-0x0000000000740000-memory.dmp
        Filesize

        1024KB

      • memory/1668-8-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/1668-7-0x0000000000400000-0x00000000004C4000-memory.dmp
        Filesize

        784KB

      • memory/1668-3-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/2796-16-0x0000000000400000-0x00000000004C4000-memory.dmp
        Filesize

        784KB

      • memory/2852-46-0x0000000000300000-0x0000000000305000-memory.dmp
        Filesize

        20KB

      • memory/2852-54-0x0000000000390000-0x0000000000397000-memory.dmp
        Filesize

        28KB

      • memory/2852-15-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2852-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2852-17-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2852-19-0x00000000018C0000-0x0000000001ACF000-memory.dmp
        Filesize

        2.1MB

      • memory/2852-26-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-22-0x00000000018C0000-0x0000000001ACF000-memory.dmp
        Filesize

        2.1MB

      • memory/2852-23-0x00000000001D0000-0x00000000001D6000-memory.dmp
        Filesize

        24KB

      • memory/2852-44-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-49-0x0000000000300000-0x0000000000305000-memory.dmp
        Filesize

        20KB

      • memory/2852-13-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2852-45-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-50-0x0000000005470000-0x000000000587B000-memory.dmp
        Filesize

        4.0MB

      • memory/2852-53-0x0000000005470000-0x000000000587B000-memory.dmp
        Filesize

        4.0MB

      • memory/2852-10-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2852-33-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-32-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-30-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-29-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-43-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-42-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-41-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-40-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-39-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-38-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-37-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-36-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-35-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-34-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB

      • memory/2852-31-0x00000000002F0000-0x0000000000300000-memory.dmp
        Filesize

        64KB