Analysis

  • max time kernel
    132s
  • max time network
    112s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    29-03-2021 10:57

General

  • Target

    4ae110bb89ddcc45bb2c4e980794195ee5eb85b5261799caedef7334f0f57cc4.exe

  • Size

    678KB

  • MD5

    82143033173cbeee7f559002fb8ab8c5

  • SHA1

    e03aedb8b9770f899a29f1939636db43825e95cf

  • SHA256

    4ae110bb89ddcc45bb2c4e980794195ee5eb85b5261799caedef7334f0f57cc4

  • SHA512

    77377c732c3fb944f56170e6382fbc25e8bbe1f2ffd42290c52da5f33f7301272c67356843464c89bba71b8c45e3d4222fe70bb7a1f80bbe89b3ce2dc498dcf1

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 4 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\4ae110bb89ddcc45bb2c4e980794195ee5eb85b5261799caedef7334f0f57cc4.exe
    "C:\Users\Admin\AppData\Local\Temp\4ae110bb89ddcc45bb2c4e980794195ee5eb85b5261799caedef7334f0f57cc4.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:4032
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:3924
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2328
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1488
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:976
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:4056
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1884
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2684

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/976-5-0x0000000000000000-mapping.dmp

  • memory/1488-4-0x0000000000000000-mapping.dmp

  • memory/1884-7-0x0000000000000000-mapping.dmp

  • memory/2328-3-0x0000000000000000-mapping.dmp

  • memory/3924-2-0x0000000000000000-mapping.dmp

  • memory/4056-6-0x0000000000000000-mapping.dmp