Analysis

  • max time kernel
    138s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230221-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230221-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21-03-2023 14:39

General

  • Target

    66c50293737f9b121c162073ef894bff11906e8fad9b3c4d0f77f0e49f586d7e.exe

  • Size

    328KB

  • MD5

    01373d57fe51a8c713ff58681b73b545

  • SHA1

    fdde9f7b9b943e8c618ea471ca3d59642530b7d8

  • SHA256

    66c50293737f9b121c162073ef894bff11906e8fad9b3c4d0f77f0e49f586d7e

  • SHA512

    29929961a67d31e5ee696a9b80326e6c1b28490d9e575f580467d11b7051ea94c88fe7a1590f54b44d33b41402b2428d43e06df6b2e9a574246e3af481583cd1

  • SSDEEP

    6144:evSBanJK/5kPas8N0HEAAf1vbViarAWbd33IEPT:evjas8uHEAAtvBpk9EPT

Score
10/10

Malware Config

Signatures

  • Process spawned unexpected child process 1 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Loads dropped DLL 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Program crash 1 IoCs
  • Modifies registry class 44 IoCs
  • Script User-Agent 1 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\66c50293737f9b121c162073ef894bff11906e8fad9b3c4d0f77f0e49f586d7e.exe
    "C:\Users\Admin\AppData\Local\Temp\66c50293737f9b121c162073ef894bff11906e8fad9b3c4d0f77f0e49f586d7e.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2780
    • C:\Users\Admin\AppData\Local\Temp\66c50293737f9b121c162073ef894bff11906e8fad9b3c4d0f77f0e49f586d7e.exe
      "C:\Users\Admin\AppData\Local\Temp\66c50293737f9b121c162073ef894bff11906e8fad9b3c4d0f77f0e49f586d7e.exe" -h
      2⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:384
  • C:\Windows\system32\rundll32.exe
    rundll32.exe "C:\Users\Admin\AppData\Local\Temp\db.dll",open
    1⤵
    • Process spawned unexpected child process
    • Suspicious use of WriteProcessMemory
    PID:3380
    • C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe "C:\Users\Admin\AppData\Local\Temp\db.dll",open
      2⤵
      • Loads dropped DLL
      PID:4084
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 4084 -s 600
        3⤵
        • Program crash
        PID:3648
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4084 -ip 4084
    1⤵
      PID:3636

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Discovery

    Query Registry

    1
    T1012

    System Information Discovery

    2
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\db.dat
      Filesize

      557KB

      MD5

      9dd748ec666aca6d3fee60839649fb02

      SHA1

      d09baa2751e2972fca1ded62d40823889ca8d41d

      SHA256

      555ced7986ad075033f84cf3b656143f7ca8194aa5824415d2d668123e59fac6

      SHA512

      1faff5e33104061a8479b4e03979e23c9814d14a19d780b5b6cdd81af5f371fcd6f96c8f08ba3760b7b660dcf9667e7e7e9f13284d119936bed046cc19c5fdb8

    • C:\Users\Admin\AppData\Local\Temp\db.dll
      Filesize

      52KB

      MD5

      1b20e998d058e813dfc515867d31124f

      SHA1

      c9dc9c42a748af18ae1a8c882b90a2b9e3313e6f

      SHA256

      24a53033a2e89acf65f6a5e60d35cb223585817032635e81bf31264eb7dabd00

      SHA512

      79849fbdb9a9e7f7684b570d14662448b093b8aa2b23dfd95856db3a78faf75a95d95c51b8aa8506c4fbecffebcc57cd153dda38c830c05b8cd38629fae673c6

    • C:\Users\Admin\AppData\Local\Temp\db.dll
      Filesize

      52KB

      MD5

      1b20e998d058e813dfc515867d31124f

      SHA1

      c9dc9c42a748af18ae1a8c882b90a2b9e3313e6f

      SHA256

      24a53033a2e89acf65f6a5e60d35cb223585817032635e81bf31264eb7dabd00

      SHA512

      79849fbdb9a9e7f7684b570d14662448b093b8aa2b23dfd95856db3a78faf75a95d95c51b8aa8506c4fbecffebcc57cd153dda38c830c05b8cd38629fae673c6