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Analysis

  • max time kernel
    149s
  • max time network
    163s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/10/2023, 17:04

General

  • Target

    206ca3f88f29ee80ca16649e17efcce1ee750c45ce1a6762f96f6d6d049993e5.exe

  • Size

    254KB

  • MD5

    400d83c136d4003e1137471d3900f267

  • SHA1

    c26b5043bea1c3176d9d605b782010542ef7d26e

  • SHA256

    206ca3f88f29ee80ca16649e17efcce1ee750c45ce1a6762f96f6d6d049993e5

  • SHA512

    907cfcaa1b90d79261cbd84d3876a79d34de120ab4d6b34afef20aeef916efa1ce098967e9a568e57c476ab3f8af9ed19aa4541f91741299288cfbc881cccdd3

  • SSDEEP

    3072:WyBNUf2KxA+GRKv3XgAYUzBefFzGdrgRiyVHhoLA48vQX:9FMA+KKvHgn4tIiyVHqL

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
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\206ca3f88f29ee80ca16649e17efcce1ee750c45ce1a6762f96f6d6d049993e5.exe
    "C:\Users\Admin\AppData\Local\Temp\206ca3f88f29ee80ca16649e17efcce1ee750c45ce1a6762f96f6d6d049993e5.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4352
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mxltgfui\
      2⤵
        PID:2896
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\elkxffnr.exe" C:\Windows\SysWOW64\mxltgfui\
        2⤵
          PID:2412
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create mxltgfui binPath= "C:\Windows\SysWOW64\mxltgfui\elkxffnr.exe /d\"C:\Users\Admin\AppData\Local\Temp\206ca3f88f29ee80ca16649e17efcce1ee750c45ce1a6762f96f6d6d049993e5.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2536
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description mxltgfui "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2444
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start mxltgfui
          2⤵
          • Launches sc.exe
          PID:3000
        • 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:388
      • C:\Windows\SysWOW64\mxltgfui\elkxffnr.exe
        C:\Windows\SysWOW64\mxltgfui\elkxffnr.exe /d"C:\Users\Admin\AppData\Local\Temp\206ca3f88f29ee80ca16649e17efcce1ee750c45ce1a6762f96f6d6d049993e5.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4260
        • 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:4972

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.0MB

        MD5

        4574691d233b6e73c953635955c06cf3

        SHA1

        90a9bc6adb0743f65c6b621b8e4da69e9065ea25

        SHA256

        05774c9f9acda997191a361a3316e50a4936155304a0f2511a4f92853c792654

        SHA512

        6d9da371122c507cd22c36dad93ca09803ca56d3e4cf18e16cb04c9e279bd95dcb05adc3542cf3d2c79679638e6bb37f3444de8e5919bd5e54b29693d86d1728

      • C:\Windows\SysWOW64\mxltgfui\elkxffnr.exe

        Filesize

        10.0MB

        MD5

        4574691d233b6e73c953635955c06cf3

        SHA1

        90a9bc6adb0743f65c6b621b8e4da69e9065ea25

        SHA256

        05774c9f9acda997191a361a3316e50a4936155304a0f2511a4f92853c792654

        SHA512

        6d9da371122c507cd22c36dad93ca09803ca56d3e4cf18e16cb04c9e279bd95dcb05adc3542cf3d2c79679638e6bb37f3444de8e5919bd5e54b29693d86d1728

      • memory/4260-14-0x0000000000400000-0x00000000007C9000-memory.dmp

        Filesize

        3.8MB

      • memory/4260-10-0x0000000000A50000-0x0000000000B50000-memory.dmp

        Filesize

        1024KB

      • memory/4260-11-0x0000000000400000-0x00000000007C9000-memory.dmp

        Filesize

        3.8MB

      • memory/4352-2-0x0000000000A70000-0x0000000000A83000-memory.dmp

        Filesize

        76KB

      • memory/4352-4-0x0000000000400000-0x00000000007C9000-memory.dmp

        Filesize

        3.8MB

      • memory/4352-7-0x0000000000400000-0x00000000007C9000-memory.dmp

        Filesize

        3.8MB

      • memory/4352-8-0x0000000000A70000-0x0000000000A83000-memory.dmp

        Filesize

        76KB

      • memory/4352-1-0x0000000000B00000-0x0000000000C00000-memory.dmp

        Filesize

        1024KB

      • memory/4972-33-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-38-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-18-0x00000000005E0000-0x00000000005F5000-memory.dmp

        Filesize

        84KB

      • memory/4972-20-0x00000000005E0000-0x00000000005F5000-memory.dmp

        Filesize

        84KB

      • memory/4972-21-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/4972-24-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/4972-25-0x00000000009F0000-0x00000000009F6000-memory.dmp

        Filesize

        24KB

      • memory/4972-28-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-31-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-32-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-12-0x00000000005E0000-0x00000000005F5000-memory.dmp

        Filesize

        84KB

      • memory/4972-34-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-35-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-36-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-37-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-17-0x00000000005E0000-0x00000000005F5000-memory.dmp

        Filesize

        84KB

      • memory/4972-39-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-40-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-41-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-42-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-43-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-44-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-45-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-46-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-47-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/4972-48-0x0000000001BD0000-0x0000000001BD5000-memory.dmp

        Filesize

        20KB

      • memory/4972-51-0x0000000001BD0000-0x0000000001BD5000-memory.dmp

        Filesize

        20KB

      • memory/4972-52-0x0000000007680000-0x0000000007A8B000-memory.dmp

        Filesize

        4.0MB

      • memory/4972-55-0x0000000007680000-0x0000000007A8B000-memory.dmp

        Filesize

        4.0MB

      • memory/4972-56-0x0000000001BE0000-0x0000000001BE7000-memory.dmp

        Filesize

        28KB