Analysis

  • max time kernel
    150s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220331-en
  • submitted
    08/04/2022, 10:48

General

  • Target
    8939141fb565c044895627bbeb522d840d24899dec53545e4a925012dbf83230.exe
  • Size 669KB
  • Sample220408-mv4e3scde5
  • SHA256 8939141fb565c044895627bbeb522d840d24899dec53545e4a925012dbf83230
  • MD5 SHA1 SHA512

Malware Config

Extracted

Path
  • C:\HOW_TO_RECOVER_DATA.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;">1BB7D095ADCD9E34DB224702CD9B03EF55EBD764468023E5BC3752DF746030CC6E1616AEE7E74FC6F4C4D305DA49ABFEE928AB5D01A28463753B7B8060E8B433<br>0AA700382C13464B7553019DB85D42730F6EB9C66B90BF5F8A3FF0A0053C69B0390E61C30C17A481768BB84BC78FF2FC4D68EF91563FF170F513515DEC5B<br>DC88BF59D028EF04363011AEDA419510291297F13FA0C94621842546E07AD07CDBE521665E0156F6DBC513BB0E12C2CFDDDB4B8E6ADC085D338FEC281F45<br>83C019D18ED7070D12BA3D01AAD80A3F4C557218B8719BE0D4200D0E6CFCE88C15D547F0EE5A05EFF87758CEEED4F7B5EFA7107CFFA9F5051E2CD0B0143C<br>F5C2033709A5329436E573B06ED98967FB3FEC6835FC0EB0FBDBEA99DE5549805479AE8EBA2D5D5646BB7469ABA1FBC8EA1E07E4B97EB075B0C01DB1CCFE<br>5F6DBF809B38C72B237F11C0151CB8AF19C12B70ED6447AA0C64CC953A22C2AA866CEDD60AE2493C1D97B446987A2721153052AFF066CCBD522D461C5216<br>9A23929C103C3994D8D1F862DBFDDEAD38E34820289D8375708FEB4114C717651528402D2F9249100CF3FF172FBC2ED437642356EDC72A16E2A8BECB2FBB<br>5AE931D680E5061276824C56856A6BEE8963111084743B67D24F704589F895BD3A7B2E79ACA3EE7C10412604C11E7940A1BBF4CF0CA72BBAC6BD03BBCF29<br>4C9F55B2B36AEB125D100BFCBD80</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>qd7pcafncosqfqu3ha6fcx4h6sr7tzwagzpcdcnytiw3b6varaeqv5yd.onion</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 <a>qd7pcafncosqfqu3ha6fcx4h6sr7tzwagzpcdcnytiw3b6varaeqv5yd.onion</a><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="mailto:[email protected] ">[email protected] m </a> <br><a href="mailto:[email protected]">[email protected]</a> <br> <b>* To contact us, create a new free email account on the site:</b> <a href="https://protonmail.com">protonmail.com<br> <hr> <b> 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>
Emails

Signatures

  • MedusaLocker

    Ransomware with several variants first seen in September 2019.

  • MedusaLocker Payload 2 IoCs
  • UAC bypass 3 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies extensions of user files 3 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.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 63 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs
  • System policy modification 1 TTPs 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8939141fb565c044895627bbeb522d840d24899dec53545e4a925012dbf83230.exe
    "C:\Users\Admin\AppData\Local\Temp\8939141fb565c044895627bbeb522d840d24899dec53545e4a925012dbf83230.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:4816
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4268
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1816
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4880
  • C:\Users\Admin\AppData\Roaming\svhost.exe
    C:\Users\Admin\AppData\Roaming\svhost.exe
    1⤵
    • Executes dropped EXE
    PID:4592

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        svhost.exe

        • Path C:\Users\Admin\AppData\Roaming\svhost.exe
        • Size 669KB
        • SHA256 8939141fb565c044895627bbeb522d840d24899dec53545e4a925012dbf83230
        • MD5 SHA1 SHA512 SSDEEP

        svhost.exe

        • Path C:\Users\Admin\AppData\Roaming\svhost.exe
        • Size 669KB
        • SHA256 8939141fb565c044895627bbeb522d840d24899dec53545e4a925012dbf83230
        • MD5 SHA1 SHA512 SSDEEP