Analysis

  • max time kernel
    196s
  • max time network
    239s
  • platform
    windows7_x64
  • resource
    win7-20231023-en
  • resource tags

    arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
  • submitted
    19/11/2023, 23:33

General

  • Target

    7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe

  • Size

    338KB

  • MD5

    5c5387efb7f70cd46012c6f8f4cc0e1a

  • SHA1

    c2ad2a7be652d8b73cdeb794b498c03d8f783bc4

  • SHA256

    7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2

  • SHA512

    bc6a38573e87fc6bc7b945ee76f5b8102e5adfa1ff6262356212a0fb66f2b4cb071193df75f05da715627d1d4c5cb2cd733f786371bf271e5ee94f88557de65d

  • SSDEEP

    3072:M9xApN8qo8I+HI0C+iUn9wYaA8MqfvJLAiT12Rerybp80C:wTqoQHIbYatRJLAiT3ry3

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) 1 TTPs
  • Modifies Windows Firewall 1 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 5 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe
    "C:\Users\Admin\AppData\Local\Temp\7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1836
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wjiuberj\
      2⤵
        PID:2528
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zxmundyu.exe" C:\Windows\SysWOW64\wjiuberj\
        2⤵
          PID:2496
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wjiuberj binPath= "C:\Windows\SysWOW64\wjiuberj\zxmundyu.exe /d\"C:\Users\Admin\AppData\Local\Temp\7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1996
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wjiuberj "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:632
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wjiuberj
          2⤵
          • Launches sc.exe
          PID:588
        • 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:2864
      • C:\Windows\SysWOW64\wjiuberj\zxmundyu.exe
        C:\Windows\SysWOW64\wjiuberj\zxmundyu.exe /d"C:\Users\Admin\AppData\Local\Temp\7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2920
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2808

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

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

              Filesize

              12.1MB

              MD5

              d2f6a9bf1861a9cc98aed20a870b6217

              SHA1

              4da0ce9bdced61ece7c92751b58ea898a2fef6dc

              SHA256

              30f50485ccd74656689e984c8c987d53ca722abbdb073af01cbcf79542c477a8

              SHA512

              78ecd5da94259a6b97348a09a3fea28c6270132d19b6c2963ce72bde8aab6eb377291b493a3deefa4265480128d8fb707d9c0b5ae550d9d00a73e69e6d74b6a2

            • C:\Windows\SysWOW64\wjiuberj\zxmundyu.exe

              Filesize

              12.1MB

              MD5

              d2f6a9bf1861a9cc98aed20a870b6217

              SHA1

              4da0ce9bdced61ece7c92751b58ea898a2fef6dc

              SHA256

              30f50485ccd74656689e984c8c987d53ca722abbdb073af01cbcf79542c477a8

              SHA512

              78ecd5da94259a6b97348a09a3fea28c6270132d19b6c2963ce72bde8aab6eb377291b493a3deefa4265480128d8fb707d9c0b5ae550d9d00a73e69e6d74b6a2

            • memory/1836-1-0x0000000000400000-0x000000000089D000-memory.dmp

              Filesize

              4.6MB

            • memory/1836-2-0x0000000000990000-0x0000000000A90000-memory.dmp

              Filesize

              1024KB

            • memory/1836-3-0x0000000000230000-0x0000000000243000-memory.dmp

              Filesize

              76KB

            • memory/1836-5-0x0000000000400000-0x000000000089D000-memory.dmp

              Filesize

              4.6MB

            • memory/1836-7-0x0000000000990000-0x0000000000A90000-memory.dmp

              Filesize

              1024KB

            • memory/1836-8-0x0000000000230000-0x0000000000243000-memory.dmp

              Filesize

              76KB

            • memory/1836-9-0x0000000000400000-0x000000000089D000-memory.dmp

              Filesize

              4.6MB

            • memory/1836-12-0x0000000000400000-0x000000000089D000-memory.dmp

              Filesize

              4.6MB

            • memory/2808-48-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-42-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-18-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/2808-17-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2808-66-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2808-20-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2808-24-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2808-25-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2808-27-0x0000000001AA0000-0x0000000001CAF000-memory.dmp

              Filesize

              2.1MB

            • memory/2808-30-0x0000000001AA0000-0x0000000001CAF000-memory.dmp

              Filesize

              2.1MB

            • memory/2808-31-0x0000000000110000-0x0000000000116000-memory.dmp

              Filesize

              24KB

            • memory/2808-34-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-37-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-38-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-39-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-40-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-41-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-62-0x00000000001A0000-0x00000000001A7000-memory.dmp

              Filesize

              28KB

            • memory/2808-43-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-45-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-44-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-46-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-47-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-61-0x0000000005980000-0x0000000005D8B000-memory.dmp

              Filesize

              4.0MB

            • memory/2808-49-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-50-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-51-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-53-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-52-0x0000000000140000-0x0000000000150000-memory.dmp

              Filesize

              64KB

            • memory/2808-54-0x0000000000150000-0x0000000000155000-memory.dmp

              Filesize

              20KB

            • memory/2808-57-0x0000000000150000-0x0000000000155000-memory.dmp

              Filesize

              20KB

            • memory/2808-58-0x0000000005980000-0x0000000005D8B000-memory.dmp

              Filesize

              4.0MB

            • memory/2920-15-0x0000000000960000-0x0000000000A60000-memory.dmp

              Filesize

              1024KB

            • memory/2920-16-0x0000000000400000-0x000000000089D000-memory.dmp

              Filesize

              4.6MB

            • memory/2920-22-0x0000000000400000-0x000000000089D000-memory.dmp

              Filesize

              4.6MB