Analysis

  • max time kernel
    146s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240319-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240319-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25/03/2024, 15:05

General

  • Target

    de4b82a7ffeafcc4720ea974858808fd.exe

  • Size

    12.5MB

  • MD5

    de4b82a7ffeafcc4720ea974858808fd

  • SHA1

    5fe3e02097b77dc5696e5c70c73c86beeec1653d

  • SHA256

    ef25242cd655ccffe910bec6a1625773d929fb0bc657a8af0a72442af126c7b1

  • SHA512

    474fd7aa6edfa92e13656c1bfd835f0f9b9905c2ae0c0d6766ade1c08b6449e90d95ae921c3fd2ce2ba7dc6ecc5c0a08507f86ea3be6c5847d5db8fc58b2265d

  • SSDEEP

    24576:TjCj10HSqGgeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee/:T/D

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru

refabyd.info

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 2 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.

  • Executes dropped EXE 1 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).

  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\de4b82a7ffeafcc4720ea974858808fd.exe
    "C:\Users\Admin\AppData\Local\Temp\de4b82a7ffeafcc4720ea974858808fd.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3644
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\usiuxfcn\
      2⤵
        PID:2068
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ziuakfbr.exe" C:\Windows\SysWOW64\usiuxfcn\
        2⤵
          PID:3300
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create usiuxfcn binPath= "C:\Windows\SysWOW64\usiuxfcn\ziuakfbr.exe /d\"C:\Users\Admin\AppData\Local\Temp\de4b82a7ffeafcc4720ea974858808fd.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4236
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description usiuxfcn "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3196
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start usiuxfcn
          2⤵
          • Launches sc.exe
          PID:4500
        • 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:1704
      • C:\Windows\SysWOW64\usiuxfcn\ziuakfbr.exe
        C:\Windows\SysWOW64\usiuxfcn\ziuakfbr.exe /d"C:\Users\Admin\AppData\Local\Temp\de4b82a7ffeafcc4720ea974858808fd.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4608
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          PID:4936
      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1040 --field-trial-handle=2276,i,5672504106535478802,17394903851940863593,262144 --variations-seed-version /prefetch:8
        1⤵
          PID:1564

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

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

          Filesize

          10.0MB

          MD5

          f08a9951342f5405aef3495d71494081

          SHA1

          80ca74618df12621d393e49da5082b9f054e5b0d

          SHA256

          334b712b6dc2157607eb44a7c97cb4ba46d16bcb8a51110995c930207e87d73d

          SHA512

          5eef7ed61e3c0870166a0def5f10e88cbe69ebdf7e41eba1557f399ae38b3c95ba4cf0b9f2050be9ff8dbb5f826878f84c9cc77b4551139e66826502974e40b3

        • C:\Windows\SysWOW64\usiuxfcn\ziuakfbr.exe

          Filesize

          4.6MB

          MD5

          5a66bc2084b6210e4bd1efb1eb1136f4

          SHA1

          1a6250b455f06043ea680e0cd50805fcabc2aaff

          SHA256

          ee1cce5b18d65851138dee09b02fb637cdd0f7fc6cd1d2059bf59da0e79aee23

          SHA512

          6b18c0634affeff40d97be395806ff87f46558dd40334b2d69514b8dfc4c54f2e590a34e76488e5b51a7ea7d5f38559ef6ed0d31f5e8c5b8e6a524142cd98b38

        • memory/3644-14-0x0000000000400000-0x000000000046E000-memory.dmp

          Filesize

          440KB

        • memory/3644-2-0x00000000004F0000-0x0000000000503000-memory.dmp

          Filesize

          76KB

        • memory/3644-3-0x0000000000400000-0x000000000046E000-memory.dmp

          Filesize

          440KB

        • memory/3644-24-0x00000000005D0000-0x00000000006D0000-memory.dmp

          Filesize

          1024KB

        • memory/3644-1-0x00000000005D0000-0x00000000006D0000-memory.dmp

          Filesize

          1024KB

        • memory/4608-18-0x0000000000400000-0x000000000046E000-memory.dmp

          Filesize

          440KB

        • memory/4608-9-0x0000000000400000-0x000000000046E000-memory.dmp

          Filesize

          440KB

        • memory/4608-22-0x00000000006D0000-0x00000000006E3000-memory.dmp

          Filesize

          76KB

        • memory/4608-8-0x0000000000770000-0x0000000000870000-memory.dmp

          Filesize

          1024KB

        • memory/4936-13-0x0000000000F10000-0x0000000000F25000-memory.dmp

          Filesize

          84KB

        • memory/4936-10-0x0000000000F10000-0x0000000000F25000-memory.dmp

          Filesize

          84KB

        • memory/4936-15-0x0000000000F10000-0x0000000000F25000-memory.dmp

          Filesize

          84KB

        • memory/4936-16-0x0000000000F10000-0x0000000000F25000-memory.dmp

          Filesize

          84KB

        • memory/4936-26-0x0000000000F10000-0x0000000000F25000-memory.dmp

          Filesize

          84KB