Analysis

  • max time kernel
    150s
  • max time network
    45s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    29-09-2022 09:44

General

  • Target

    a5fdfacc22914d12eec28fb085f026401db10ae51d4e549dfec6160501be0dcf.exe

  • Size

    669KB

  • MD5

    225fef16f054c69c11dfc5a22007c650

  • SHA1

    9ee3f21f5d6c9266c0a368bfa60076715dff6ed9

  • SHA256

    a5fdfacc22914d12eec28fb085f026401db10ae51d4e549dfec6160501be0dcf

  • SHA512

    b20f3ce34675078174085537f982fb7702d90fefead38481ad3a3d8b34c591c4a4ae8c24fb95810b79ed71427044d2ccf501cb095e6edc64bf673400c7bd584c

  • SSDEEP

    12288:dQA0FfTcwpBuV2UxqDmuiLZeUaoFi2XZWfGe615HhAZV8DbKD/KeX:Tuf4wTuV2Ux3uIZeUBi2Te6HW6KrKe

Malware Config

Signatures

  • MedusaLocker

    Ransomware with several variants first seen in September 2019.

  • MedusaLocker payload 2 IoCs
  • UAC bypass 3 TTPs 2 IoCs
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Executes dropped EXE 1 IoCs
  • Modifies extensions of user files 2 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.

  • Interacts with shadow copies 2 TTPs 3 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 63 IoCs
  • Suspicious use of WriteProcessMemory 28 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:896
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:904
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1012
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1700
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:636
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:340
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1920
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1372
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {BCC3F42F-B3F0-4A5A-A74A-718F773CA492} S-1-5-21-2292972927-2705560509-2768824231-1000:GRXNNIIE\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:776
    • C:\Users\Admin\AppData\Roaming\svhost.exe
      C:\Users\Admin\AppData\Roaming\svhost.exe
      2⤵
      • Executes dropped EXE
      PID:1100

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\svhost.exe

    Filesize

    669KB

    MD5

    225fef16f054c69c11dfc5a22007c650

    SHA1

    9ee3f21f5d6c9266c0a368bfa60076715dff6ed9

    SHA256

    a5fdfacc22914d12eec28fb085f026401db10ae51d4e549dfec6160501be0dcf

    SHA512

    b20f3ce34675078174085537f982fb7702d90fefead38481ad3a3d8b34c591c4a4ae8c24fb95810b79ed71427044d2ccf501cb095e6edc64bf673400c7bd584c

  • C:\Users\Admin\AppData\Roaming\svhost.exe

    Filesize

    669KB

    MD5

    225fef16f054c69c11dfc5a22007c650

    SHA1

    9ee3f21f5d6c9266c0a368bfa60076715dff6ed9

    SHA256

    a5fdfacc22914d12eec28fb085f026401db10ae51d4e549dfec6160501be0dcf

    SHA512

    b20f3ce34675078174085537f982fb7702d90fefead38481ad3a3d8b34c591c4a4ae8c24fb95810b79ed71427044d2ccf501cb095e6edc64bf673400c7bd584c

  • memory/896-54-0x0000000075B41000-0x0000000075B43000-memory.dmp

    Filesize

    8KB