Analysis

  • max time kernel
    139s
  • max time network
    151s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    08-08-2021 17:00

General

  • Target

    1e2335fef46f7320069623fff6702acb41c2877aff5fec83d94a561af37c3c7a.bin.exe

  • Size

    678KB

  • MD5

    f05df52a73ea28f25d0a85f927f2444a

  • SHA1

    a5c00571f42bad2f17db4d4032b07318abc6f7f1

  • SHA256

    1e2335fef46f7320069623fff6702acb41c2877aff5fec83d94a561af37c3c7a

  • SHA512

    0b2a3a0bde6fcc23565ccdb1df49727930ad53345f91a3450455d0e8fb431a59af74a169d8c6ae2195afc340d7fde42969638f5d4de5501d1f75737be625e0b2

Malware Config

Signatures

  • MedusaLocker

    Ransomware with several variants first seen in September 2019.

  • UAC bypass 3 TTPs
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies extensions of user files 11 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 64 IoCs
  • Suspicious use of WriteProcessMemory 18 IoCs
  • System policy modification 1 TTPs 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1e2335fef46f7320069623fff6702acb41c2877aff5fec83d94a561af37c3c7a.bin.exe
    "C:\Users\Admin\AppData\Local\Temp\1e2335fef46f7320069623fff6702acb41c2877aff5fec83d94a561af37c3c7a.bin.exe"
    1⤵
    • 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:4648
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:3560
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3828
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:4188
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:492
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:860
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1080
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4200

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/492-117-0x0000000000000000-mapping.dmp

  • memory/860-118-0x0000000000000000-mapping.dmp

  • memory/1080-119-0x0000000000000000-mapping.dmp

  • memory/3560-114-0x0000000000000000-mapping.dmp

  • memory/3828-115-0x0000000000000000-mapping.dmp

  • memory/4188-116-0x0000000000000000-mapping.dmp