Analysis

  • max time kernel
    157s
  • max time network
    137s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    01/02/2022, 15:50

General

  • Target

    1e406ec30ce6ff9998b5b1ad72232713832889e32cc890c807386831ee8dea9f.exe

  • Size

    662KB

  • MD5

    9148e0f611793ed63f4348501b3f3f9d

  • SHA1

    47b8bf8860f7c5d4c25cad24de6ab6cf525fa74f

  • SHA256

    1e406ec30ce6ff9998b5b1ad72232713832889e32cc890c807386831ee8dea9f

  • SHA512

    4f78d1dbbf70c044e86d979d646df26d4868297ffe7d59e2769bbd291c9b41a344e1d97b65bfbf74b012b39aa7cc41e0cd19003ca04e05a6572f7185023386ad

Malware Config

Extracted

Path

C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\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;">3FB10C25713CBE4CC8D318FC8B2B6A200205296F61E14C51AB069BAD32A201D19F6700EF5D2784A71D839C00CDAA28D14941AC6101658B83060417049DCCFD80<br>EB36BED4C7E3978C2722401D121935DD0BAF7252D3E7564AF8ACF9473131ADC4208D34273698238C13162BDD4853671CD0FAD5D5A02A1967EA3806F00187<br>393F6E0576ED850FE488498C559D68FE33ABE931CABEABD143C9149E2C28B4BFF284CEBA1955DEC596497285C63C1124E8CECB574494E2DF09FB08FF18A7<br>BFC4F9B90C27884D9330A858F089651F1227F5B111E0DD4269C8B72DF5276F38DDF3471ED883CCBF1FCFE056CAF814B3BE693A7DB8861D981926EA88F67A<br>A20921032B7E4C9526DFDC8FB841006D409B016DB32E4CBACD43E0106B75922AD7A2C18545D63E7E1A05756127117720E4B4F220857BD6107BE6916FA6BF<br>E58F5CA17182A635E5CEC550C7B62461E51AC45BDA2012DDD56A81CDF2B94B9F29D3E967E2120005E0DEE855891C6D03CE7D9B129C77EFB5944D460F92C3<br>1CB2AF4262FBF86BCA0DD0FA2065D9F340585EC5D033990E790CAA83F13CDB673257D52CDE9946BB3003834F6CDE03975685CFF653DD47320D2A7AE1323F<br>5A93F36633B7D243AB2283E190953F16D4707637788192DD6764C5C13B24EAB38B8B180A1FA3F7D6298F6C5F67621165C73EBBF65A5F4195B04612D7D76A<br>E1AF78132DD00175C2ED07831792</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-rmPFli0sjNORRCfXRDZs02u7XwAsjS9b-Cp0y5kQ8uHFPpVb8xsPdg94NHSPiE4l6</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.

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies extensions of user files 10 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.

  • Adds Run key to start application 2 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 29 IoCs
  • Suspicious use of AdjustPrivilegeToken 63 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs
  • System policy modification 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1e406ec30ce6ff9998b5b1ad72232713832889e32cc890c807386831ee8dea9f.exe
    "C:\Users\Admin\AppData\Local\Temp\1e406ec30ce6ff9998b5b1ad72232713832889e32cc890c807386831ee8dea9f.exe"
    1⤵
    • Modifies extensions of user files
    • Adds Run key to start application
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:1884
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:696
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:336
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1188
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1036
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:2024
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1676
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1336

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/1884-54-0x0000000075AB1000-0x0000000075AB3000-memory.dmp

    Filesize

    8KB