Analysis

  • max time kernel
    155s
  • max time network
    125s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    01-02-2022 15:20

General

  • Target

    fdc208bac64cc29000dac8a0eb82c76133f3ba1ff162b01b3fb81b1751a51604.exe

  • Size

    678KB

  • MD5

    b66384a34452aea03b6f53e0265f54e4

  • SHA1

    727ecd6e6e3135c97d1d1de85f49a96f8355996d

  • SHA256

    fdc208bac64cc29000dac8a0eb82c76133f3ba1ff162b01b3fb81b1751a51604

  • SHA512

    51ae29b3f183171501d35383850dff4e87a2945d1f8c24aebff7035ea24f3b2507b2d2bb4532a5b71dee66fa1093722436844e5528fd47cb9f084ffde3249761

Malware Config

Extracted

Path

\??\Z:\Boot\Recovery_Instructions.html

Ransom Note
<html> <style type="text/css"> body { background-color: #f5f5f5; } h1, h3{ text-align: center; text-transform: uppercase; font-weight: normal; } /*---*/ .tabs1{ display: block; margin: auto; } .tabs1 .head{ text-align: center; float: top; padding: 0px; text-transform: uppercase; font-weight: normal; display: block; background: #81bef7; color: #DF0101; font-size: 30px; } .tabs1 .identi { font-size: 10px; text-align: center; float: top; padding: 15px; display: block; background: #81bef7; color: #DFDFDF; } .tabs .content { background: #f5f5f5; /*text-align: center;*/ color: #000000; padding: 25px 15px; font-size: 15px; font-weight: 400; line-height: 20px; } .tabs .content a { color: #df0130; font-size: 23px; font-style: italic; text-decoration: none; line-height: 35px; } .tabs .content .text{ padding: 25px; line-height: 1.2; } </style> <body> <div class="tabs1"> <div class="head" ><b>Your personal ID:</b></div> <div class="identi"> <span style="width:1000px; color: #ffffff; font-size: 10px;">FC6B3C70EC202E79A6C21733154A31DD9AF839B7DE38A5DD6659015E05A581D60A3033C244F9BA0BD885AC8E4305D3AB4D6BDEBAEB232538EC588AF0E2F32917<br>718B0CDC2BC0142875E1508E62113798A86E07C915036A9043ABF9471095FDCB2397C60968FFB258E10A4D8246AE87D9A6A96C95DB80BA32E2FC47D0A597<br>EA17229BC2500CA4BE83E994B07C4271666AFF09E91779A61AB823693CA658F6597B081A3176DD95B794F6E9072722B0F57D74478E47DB76001444697FE4<br>A8E523D4B7CCF5771ECF4AC07955805496DF8002CFB09F0A4CAC0B42A323FCA0EEE387CF5739362499B30DE7C8B02AA73047DCB6DCC3D13414FC71C0949A<br>4ECF0801F94D151D4CC4C458ED6C5EDCF6E3448825A5F3E3F2C6F7C805177900365B4DA6CB5E4D1D3E008EABC878255093F9EF6285783DF9989A815A1550<br>0E25E6EE4F8291767393BADD1E96AD6025BCBD923085A1D9225FD3BAC00DF0C267E6999BF26697121FE5C26F1E3B76B1DDD8A15D3BD737F7BDDA8AF32E1C<br>06EA7C80B65F398D4C46E1E46BE245C94BCA9BD594FEEA07A963ED23233E05B469D1C9F4C7CC08FA414AE3461AE6FC4AF7E34263158B6B498CCD98993761<br>DB9EAECAD8E583DA9B3523E997FF634F944EAF231ECC2BD31B08200C0F092B4EF37D3643E68E766872689A71A29C0350F8FBD9C4086B66866FCF322D250A<br>9AC005864ED253CCA0C1814AB179</span> <br> <!-- !!! dont changing this !!! --> </div> </div> <!-- --> <div class="tabs"> <!--tab--> <div class="tab"> <div id="tab-content1" class="content"> <div class="text"> <!--text data --> <b>/!\ YOUR COMPANY NETWORK HAS BEEN PENETRATED /!\</b><br> <b>All your important files have been encrypted!</b><br><br> <hr> Your files are safe! Only modified. (RSA+AES)<br><br> ANY ATTEMPT TO RESTORE YOUR FILES WITH THIRD-PARTY SOFTWARE<br> WILL PERMANENTLY CORRUPT IT.<br> DO NOT MODIFY ENCRYPTED FILES.<br> DO NOT RENAME ENCRYPTED FILES.<br><br> No software available on internet can help you. We are the only ones able to<br> solve your problem.<br><br> We gathered highly confidential/personal data. These data are currently stored on<br> a private server. This server will be immediately destroyed after your payment.<br> If you decide to not pay, we will release your data to public or re-seller.<br> So you can expect your data to be publicly available in the near future..<br><br> We only seek money and our goal is not to damage your reputation or prevent<br> your business from running.<br><br> You will can send us 2-3 non-important files and we will decrypt it for free<br> to prove we are able to give your files back.<br><br> <!--text data --> <hr> <b>Contact us for price and get decryption software.</b><br><br> <a>http://gvlay6u4g53rxdi5.onion/21-3L69YMmXGyCo9EEXDhxUpinUQ5ACt9YB-ZDQx80I8CgeTT6gLa1pNWO2VwG6J5Osi</a><br> * Note that this server is available via Tor browser only<br><br> Follow the instructions to open the link:<br> 1. Type the addres "https://www.torproject.org" in your Internet browser. It opens the Tor site.<br> 2. Press "Download Tor", then press "Download Tor Browser Bundle", install and run it.<br> 3. Now you have Tor browser. In the Tor Browser open "{{URL}}". <br> 4. Start a chat and follow the further instructions. <br><br> <hr> <b>If you can not use the above link, use the email:</b><br> <a href="[email protected]">[email protected]</a> <br><a href="[email protected]">[email protected]</a> <br> <b>* To contact us, create a new mail on the site:</b> <a href="https://protonmail.com">protonmail.com<br> <hr> <b>Make contact as soon as possible. Your private key (decryption key) <br> is only stored temporarily.<br><br> IF YOU DON'T CONTACT US WITHIN 72 HOURS, PRICE WILL BE HIGHER.</b><br> </div> </div> </div> <!--tab--> <!--text data --> </div> </div> <!--tab--> </div> </div> </body> </html>

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\fdc208bac64cc29000dac8a0eb82c76133f3ba1ff162b01b3fb81b1751a51604.exe
    "C:\Users\Admin\AppData\Local\Temp\fdc208bac64cc29000dac8a0eb82c76133f3ba1ff162b01b3fb81b1751a51604.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:960
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1096
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1792
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:440
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1400
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1816
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1296
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1000
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {BDA510AC-9036-4C53-BD3F-AFC5FE2372AB} S-1-5-21-3846991908-3261386348-1409841751-1000:VQVVOAJK\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:896
    • C:\Users\Admin\AppData\Roaming\svhost.exe
      C:\Users\Admin\AppData\Roaming\svhost.exe
      2⤵
      • Executes dropped EXE
      PID:1680

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/960-54-0x0000000075D11000-0x0000000075D13000-memory.dmp

    Filesize

    8KB