Analysis

  • max time kernel
    150s
  • max time network
    144s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/09/2022, 09:44

General

  • Target
    a5fdfacc22914d12eec28fb085f026401db10ae51d4e549dfec6160501be0dcf.exe
  • Size 669KB
  • Sample220929-lqg6lsada5
  • SHA256 a5fdfacc22914d12eec28fb085f026401db10ae51d4e549dfec6160501be0dcf
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • MedusaLocker

    Ransomware with several variants first seen in September 2019.

  • MedusaLocker payload 2 IoCs
  • UAC bypass 3 TTPs 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Modifies extensions of user files 13 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Drops desktop.ini file(s) 1 IoCs
  • Enumerates connected drives 3 TTPs 24 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 63 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs
  • System policy modification 1 TTPs 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a5fdfacc22914d12eec28fb085f026401db10ae51d4e549dfec6160501be0dcf.exe
    "C:\Users\Admin\AppData\Local\Temp\a5fdfacc22914d12eec28fb085f026401db10ae51d4e549dfec6160501be0dcf.exe"
    1⤵
    • UAC bypass
    • Modifies extensions of user files
    • Checks whether UAC is enabled
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:4868
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3380
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3980
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4884
  • C:\Users\Admin\AppData\Roaming\svhost.exe
    C:\Users\Admin\AppData\Roaming\svhost.exe
    1⤵
    • Executes dropped EXE
    PID:872

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        svhost.exe

        • Path C:\Users\Admin\AppData\Roaming\svhost.exe
        • Size 669KB
        • SHA256 a5fdfacc22914d12eec28fb085f026401db10ae51d4e549dfec6160501be0dcf
        • MD5 SHA1 SHA512 SSDEEP

        svhost.exe

        • Path C:\Users\Admin\AppData\Roaming\svhost.exe
        • Size 669KB
        • SHA256 a5fdfacc22914d12eec28fb085f026401db10ae51d4e549dfec6160501be0dcf
        • MD5 SHA1 SHA512 SSDEEP