Analysis

  • max time kernel
    141s
  • max time network
    148s
  • platform
    windows7_x64
  • resource
    win7-20240508-en
  • resource tags

    arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
  • submitted
    24-05-2024 04:25

General

  • Target

    a6c7dd82eace106350d20d93956360e6.exe

  • Size

    178KB

  • MD5

    a6c7dd82eace106350d20d93956360e6

  • SHA1

    19c5ea0607b527e4c2b08a39583db38f503933e0

  • SHA256

    b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f

  • SHA512

    6e3d950e1a16103710985e9e0993f26ece5f7d67eadbd711941e826117d0d884624ddf166d3a70e25453518bb2f7d9a9c2dede25f6785dcb24d6031ba29c419e

  • SSDEEP

    1536:DAc76NGJEzLoCPMkXzxIGzA9aRmNjo/Phcnr6xMtxUtoIlESP5tA9bDQqpN+X:D7kXzxIGzA9aUo/PhcnVHUtoe5K9

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).

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe
    "C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3016
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tczzhelr\
      2⤵
        PID:2800
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jzzwiuki.exe" C:\Windows\SysWOW64\tczzhelr\
        2⤵
          PID:2620
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create tczzhelr binPath= "C:\Windows\SysWOW64\tczzhelr\jzzwiuki.exe /d\"C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2776
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description tczzhelr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2868
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start tczzhelr
          2⤵
          • Launches sc.exe
          PID:2596
        • 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
          PID:2476
      • C:\Windows\SysWOW64\tczzhelr\jzzwiuki.exe
        C:\Windows\SysWOW64\tczzhelr\jzzwiuki.exe /d"C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2512
        • 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:3028

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        12.8MB

        MD5

        2f16abb75ad256fdcb8c156cedc0dcb7

        SHA1

        a64119f15aa9595e83ce5d24898c447c0667e54d

        SHA256

        18c939a0396f9ed906c18d01b3013d51f24797747242855f85f72a4706f5204d

        SHA512

        a85d1e8ed0ee2f0ffdb4b37ffd5b4afbfb179530828e9087efcb14d9c307d6eddf21fab2ddf51eb64c9a74ca0c85fd711018dbfc869c237b8edfca4afaf0c295

      • memory/2512-12-0x0000000000400000-0x0000000002349000-memory.dmp

        Filesize

        31.3MB

      • memory/3016-3-0x0000000000400000-0x0000000002349000-memory.dmp

        Filesize

        31.3MB

      • memory/3016-2-0x0000000000400000-0x0000000002349000-memory.dmp

        Filesize

        31.3MB

      • memory/3016-14-0x0000000000400000-0x0000000002349000-memory.dmp

        Filesize

        31.3MB

      • memory/3028-45-0x0000000000100000-0x0000000000105000-memory.dmp

        Filesize

        20KB

      • memory/3028-43-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-9-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        Filesize

        4KB

      • memory/3028-15-0x00000000000D0000-0x00000000000E5000-memory.dmp

        Filesize

        84KB

      • memory/3028-16-0x00000000000D0000-0x00000000000E5000-memory.dmp

        Filesize

        84KB

      • memory/3028-18-0x0000000001A30000-0x0000000001C3F000-memory.dmp

        Filesize

        2.1MB

      • memory/3028-25-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-22-0x0000000000080000-0x0000000000086000-memory.dmp

        Filesize

        24KB

      • memory/3028-30-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-31-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-53-0x0000000000110000-0x0000000000117000-memory.dmp

        Filesize

        28KB

      • memory/3028-49-0x0000000005670000-0x0000000005A7B000-memory.dmp

        Filesize

        4.0MB

      • memory/3028-48-0x0000000000100000-0x0000000000105000-memory.dmp

        Filesize

        20KB

      • memory/3028-10-0x00000000000D0000-0x00000000000E5000-memory.dmp

        Filesize

        84KB

      • memory/3028-44-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-7-0x00000000000D0000-0x00000000000E5000-memory.dmp

        Filesize

        84KB

      • memory/3028-42-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-41-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-40-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-39-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-38-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-37-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-36-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-35-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-34-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-33-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-32-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-29-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-28-0x00000000000F0000-0x0000000000100000-memory.dmp

        Filesize

        64KB

      • memory/3028-21-0x0000000001A30000-0x0000000001C3F000-memory.dmp

        Filesize

        2.1MB

      • memory/3028-52-0x0000000005670000-0x0000000005A7B000-memory.dmp

        Filesize

        4.0MB