Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-09-2023 23:24

General

  • Target

    file.exe

  • Size

    268KB

  • MD5

    1b2cb8d1d82833a67bc3428b3aa44946

  • SHA1

    915236a5564b56fc7610bbd613247f5d42cef643

  • SHA256

    63289f790fe5380ccd80c9aeb3d370bd7d568f467e8a985bd17fb36bc5b62c45

  • SHA512

    d71e01ac1adff851c4ff5775871646c21c48ce41c8e1cd235ae5fea1613e4eb00fc6c85569aff1813c5b0a91c20becdc469e4809e3af2b29879b01a8e3507b5d

  • SSDEEP

    3072:lzOeAt4GTOX6qOjB+AQlNT6NBeSg5i1Xk4v+UwjBIhVaNWYm1T:FOeAsXfeBBQjCeSeS0/N+VThT

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.

  • 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1864
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pxqouia\
      2⤵
        PID:3264
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\iukxlkcg.exe" C:\Windows\SysWOW64\pxqouia\
        2⤵
          PID:5036
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create pxqouia binPath= "C:\Windows\SysWOW64\pxqouia\iukxlkcg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3360
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description pxqouia "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2324
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start pxqouia
          2⤵
          • Launches sc.exe
          PID:2348
        • 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:1940
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1864 -s 788
          2⤵
          • Program crash
          PID:3804
      • C:\Windows\SysWOW64\pxqouia\iukxlkcg.exe
        C:\Windows\SysWOW64\pxqouia\iukxlkcg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3104
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:3636
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3104 -s 548
          2⤵
          • Program crash
          PID:1136
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1864 -ip 1864
        1⤵
          PID:3344
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 3104 -ip 3104
          1⤵
            PID:2708

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.2MB

            MD5

            72c68e65011c056a9baabf4dccb7ae96

            SHA1

            040b59354ba233ad19654d6137f4049b0797cc7e

            SHA256

            7a403472a49c86b16ee52df2545a3589cb3f802cc9da482a6c8cabff920e0eb5

            SHA512

            1dc043ecc70fbe871770c91c3ec0b0cef83bf6617f7c34ea3d93a703f7b08db7c42ecfef5c4aaed2cf7c75d4c4739e40c0c8e3aee3586faa121472e30640ce6c

          • C:\Windows\SysWOW64\pxqouia\iukxlkcg.exe

            Filesize

            12.2MB

            MD5

            72c68e65011c056a9baabf4dccb7ae96

            SHA1

            040b59354ba233ad19654d6137f4049b0797cc7e

            SHA256

            7a403472a49c86b16ee52df2545a3589cb3f802cc9da482a6c8cabff920e0eb5

            SHA512

            1dc043ecc70fbe871770c91c3ec0b0cef83bf6617f7c34ea3d93a703f7b08db7c42ecfef5c4aaed2cf7c75d4c4739e40c0c8e3aee3586faa121472e30640ce6c

          • memory/1864-15-0x0000000000400000-0x0000000000711000-memory.dmp

            Filesize

            3.1MB

          • memory/1864-2-0x00000000009C0000-0x00000000009D3000-memory.dmp

            Filesize

            76KB

          • memory/1864-4-0x0000000000400000-0x0000000000711000-memory.dmp

            Filesize

            3.1MB

          • memory/1864-1-0x0000000000A20000-0x0000000000B20000-memory.dmp

            Filesize

            1024KB

          • memory/3104-8-0x00000000008F0000-0x00000000009F0000-memory.dmp

            Filesize

            1024KB

          • memory/3104-10-0x0000000000880000-0x0000000000893000-memory.dmp

            Filesize

            76KB

          • memory/3104-13-0x0000000000400000-0x0000000000711000-memory.dmp

            Filesize

            3.1MB

          • memory/3636-34-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-31-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-17-0x00000000001E0000-0x00000000001F5000-memory.dmp

            Filesize

            84KB

          • memory/3636-18-0x00000000001E0000-0x00000000001F5000-memory.dmp

            Filesize

            84KB

          • memory/3636-20-0x00000000001E0000-0x00000000001F5000-memory.dmp

            Filesize

            84KB

          • memory/3636-21-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/3636-24-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/3636-25-0x00000000017A0000-0x00000000017A6000-memory.dmp

            Filesize

            24KB

          • memory/3636-28-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-32-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-33-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-14-0x00000000001E0000-0x00000000001F5000-memory.dmp

            Filesize

            84KB

          • memory/3636-35-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-37-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-36-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-9-0x00000000001E0000-0x00000000001F5000-memory.dmp

            Filesize

            84KB

          • memory/3636-38-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-39-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-40-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-42-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-41-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-43-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-44-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-45-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-47-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-46-0x00000000017B0000-0x00000000017C0000-memory.dmp

            Filesize

            64KB

          • memory/3636-48-0x00000000025D0000-0x00000000025D5000-memory.dmp

            Filesize

            20KB

          • memory/3636-51-0x00000000025D0000-0x00000000025D5000-memory.dmp

            Filesize

            20KB

          • memory/3636-52-0x0000000007000000-0x000000000740B000-memory.dmp

            Filesize

            4.0MB

          • memory/3636-55-0x0000000007000000-0x000000000740B000-memory.dmp

            Filesize

            4.0MB

          • memory/3636-56-0x00000000025E0000-0x00000000025E7000-memory.dmp

            Filesize

            28KB