Analysis

  • max time kernel
    168s
  • max time network
    178s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220113
  • submitted
    01/02/2022, 15:49

General

  • Target

    2c374ad55d30b475e761bacce9dd65b34b20705b787f35612b83d04fad34fab8.exe

  • Size

    678KB

  • MD5

    3efb1e8962759d81e95aff2652f7fd13

  • SHA1

    1e9846d21b1d299f4111a76a57ce451688e20472

  • SHA256

    2c374ad55d30b475e761bacce9dd65b34b20705b787f35612b83d04fad34fab8

  • SHA512

    e8f98293c597bff349ef307cdb7bbc38470b304d682a409ce6e2e9df39f4682daad6d775ab63bbe995c50257ccc7609e5398111798d13ee546366f3fef4fcc81

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;">0EFC88EADA4A70D8C0C595137351E07925ED5F3A4E0C6D74BD61537932C0D561CB85ADD67D467E03A484979F3334155095536AFDC4B77A66A3D4047200682C74<br>E383BFAE40065F8E8034BDE8C698C2BB467350C638163144847D7C4C620AFF2C3E6D8071A443312EC1B390FFD44F61631128C0996B2B62A87BE49D056413<br>E5F9DA693A5EAFD131FCADF5E4F4EDBFCE055F5B0C635F91056115F6003D7F31E4FACEEE6BCA1A62C773FAC01ABB8DE5C158A7B6338D8A2DF7246AACA993<br>E910A62A15BE54DA657B5B1F9CCCE3D9F2BC3915B206A070E4C9EE5FB4D62879574149138AB53B937CB9C8FD72F83417E1BAD3C2543C0E74FFC36263A0B4<br>F4F0B342D58A14E1D8811D73706B45D9799CE87788B139AA949B4930DA3FDA537D6261374CAEA50AD778E128303D1828D8B931F397DB0648C89CA8B2EB0C<br>FE9E4A32F536084D63EF208470D4089313EF36B1EFA342FCAD6E0AEC255F6DA189C8C0E8CB8DDA507883F07089A18DEACE4A1C3955F396C29A3108792DA2<br>3104AC364992CA775E3B15EA9E09A66FEDDB42BCD866E7807BA01D6280F722C322C627F46ABA8D872A7A1E7526700432A9A7B8B59DA361A0624B94BE1236<br>4DF2599153C6450F14DAFA6A57AC44E1B23C0E9E6A4A089EDA1A5C1A71EE106F469AD66ABD26BF4EC39DEDD4C1A519CF2592177ECB9CB400BC7D3EDBAB61<br>0FCF4512DBE6AABD1EC70286CA67</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-W7J2bWNeNOwMhtjykwtTjHAoBnqOl4hC-uGLBHZwjab2eynrEYlN4Z8y9K09T2ONy</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
  • Executes dropped EXE 1 IoCs
  • Sets service image path in registry 2 TTPs
  • 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.

  • Drops file in Windows directory 6 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Modifies data under HKEY_USERS 41 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs
  • System policy modification 1 TTPs 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2c374ad55d30b475e761bacce9dd65b34b20705b787f35612b83d04fad34fab8.exe
    "C:\Users\Admin\AppData\Local\Temp\2c374ad55d30b475e761bacce9dd65b34b20705b787f35612b83d04fad34fab8.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:4868
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1596
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3548
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4248
  • C:\Users\Admin\AppData\Roaming\svhost.exe
    C:\Users\Admin\AppData\Roaming\svhost.exe
    1⤵
    • Executes dropped EXE
    PID:1328
  • C:\Windows\System32\WaaSMedicAgent.exe
    C:\Windows\System32\WaaSMedicAgent.exe b7a5cfad55714da9be05285dc3797389 1BOAvIqYtEOXmjoC9FFBew.0.1.0.0.0
    1⤵
    • Modifies data under HKEY_USERS
    PID:1156
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k netsvcs -p -s wuauserv
    1⤵
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    PID:1972

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/1972-144-0x0000028CF7640000-0x0000028CF7644000-memory.dmp

    Filesize

    16KB