Analysis

  • max time kernel
    162s
  • max time network
    133s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    01/02/2022, 15:29

General

  • Target

    c632ce1dc34111c66efb817f608bf3b547fc9df5fed478d736b4c53a41ba193e.exe

  • Size

    669KB

  • MD5

    187c968c9c7f70a8c65ebefac8e4f124

  • SHA1

    b5ec574920e42f117024e60852968da4f0584ff0

  • SHA256

    c632ce1dc34111c66efb817f608bf3b547fc9df5fed478d736b4c53a41ba193e

  • SHA512

    f4d21feb6518d2712e829f5b3e8209b76851ab7ae66e2673fef08545f085bf3ece191b37bcce14074eb2c3fc50de83339ac9bee92769a20b94886289554fa3f6

Malware Config

Signatures

  • MedusaLocker

    Ransomware with several variants first seen in September 2019.

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

    Ransomware often targets backup files to inhibit system recovery.

  • Executes dropped EXE 1 IoCs
  • 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\c632ce1dc34111c66efb817f608bf3b547fc9df5fed478d736b4c53a41ba193e.exe
    "C:\Users\Admin\AppData\Local\Temp\c632ce1dc34111c66efb817f608bf3b547fc9df5fed478d736b4c53a41ba193e.exe"
    1⤵
    • Checks whether UAC is enabled
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:1820
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:676
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1868
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1992
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1932
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1952
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1796
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:580
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {CD78F403-C2F2-42A5-93DD-A0B4ED3822A1} S-1-5-21-3846991908-3261386348-1409841751-1000:VQVVOAJK\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:836
    • C:\Users\Admin\AppData\Roaming\svhost.exe
      C:\Users\Admin\AppData\Roaming\svhost.exe
      2⤵
      • Executes dropped EXE
      PID:1476

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/1820-54-0x0000000075341000-0x0000000075343000-memory.dmp

    Filesize

    8KB