Analysis

  • max time kernel
    145s
  • max time network
    130s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06-04-2023 15:58

General

  • Target

    Medusa1.bin.exe

  • Size

    235KB

  • MD5

    f6f120d1262b88f79debb5d848ac7db9

  • SHA1

    1339282f9b2d2a41326daf3cf284ec2ae8f0f93c

  • SHA256

    1bc0575b3fc6486cb2510dac1ac6ae4889b94a955d3eade53d3ba3a92d133281

  • SHA512

    1067c1a73cf891d651fa007f4ccc4452f32801fe3859933ef1bcc00985e35ce016fa6c601c0e3c10df2080fc9b8a776b2f18d40bd64dfb98177ab638c4b545bd

  • SSDEEP

    6144:c5vMUmRTTgwnfeP+Jx1cLNAIyBcc9WrEWUC4wQh/6BeX:/U8Tgufnx1cLNncgQWUUQh/+e

Malware Config

Extracted

Path

\Device\HarddiskVolume1\Boot\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;">A1A02F59773A90F7352B4178FAB73F2CCA08DC26C215CE2B0D82BA0E878C26FA966976E79BD0BDD4F7614079707BDC3CB61729A5DDDD33153D193C0361B679BA<br>A33003A55B030433849C801B2C3A4995F229B2CBD9EC2F903F96D1EE072957B5F75DD983439D541A245D35DA1F2175A93FC367192E22EC1B56F66D09D824<br>54DDF5CCB0285836DFE9D94F18C59ACDABDBA66A9A6EBBDE24379CCED16618A999516BC89C9CBC11E8CF24D45781DB211271347471059272AF58EE828048<br>91B4ECF39EF8B6B96EC741F9ED56D764BCC537BE3E85512079D80994B27B988975D5821FE48A1048151D52BA99E91EEE5598FD7CB3E90593BFC9CBFF83AB<br>CE593D0E6720ABA6E62CE28F1ECCF326252B014778D38F8E10970705DFF40EC9AA8695A194DA1AC68AC251FF197BEFECF5B8074F432C1A6387FA4ED32FC2<br>7D089F8198A3E0DDDB82302178BEB0F00BB3D716B47CB289AD78C9A6DAFE95D1F15D36AC9888AE7E5AD849A3CC3B5953C3DD8628917680B71551A628BB34<br>A446E39D1292D4C94608471F0A5169053817EFCAA4F83DABA0CA6986D6BB0982372F1E57AFB346E88220BCEB11AE8097318F4815DA4E1ABF2EC33B1CA25C<br>0141BEBE7B917AAFCDFD5DCBAA6EE84097E6B3FE99F5B2419BBB394B0FEFD4E00D5A518CA01407F5736C04F0FE73B6FF1CCB8B78C9D8698AF7178C972F63<br>CBE610240D32B64EB10A6FFC8925</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<br> </a> 4. Start a chat and follow the further instructions. <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> <p>* To contact us, create a new free email account on the site: <a href="https://protonmail.com">protonmail.com <br> <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>

Signatures

  • MedusaLocker

    Ransomware with several variants first seen in September 2019.

  • MedusaLocker payload 15 IoCs
  • UAC bypass 3 TTPs 2 IoCs
  • Modifies extensions of user files 5 IoCs

    Ransomware generally changes the extension on encrypted files.

  • 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.

  • UPX packed file 18 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • 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\Medusa1.bin.exe
    "C:\Users\Admin\AppData\Local\Temp\Medusa1.bin.exe"
    1⤵
    • UAC bypass
    • 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:384
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:588
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3840
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4788
  • C:\Users\Admin\AppData\Roaming\svhost.exe
    C:\Users\Admin\AppData\Roaming\svhost.exe
    1⤵
    • Executes dropped EXE
    PID:2988

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\svhost.exe

    Filesize

    235KB

    MD5

    f6f120d1262b88f79debb5d848ac7db9

    SHA1

    1339282f9b2d2a41326daf3cf284ec2ae8f0f93c

    SHA256

    1bc0575b3fc6486cb2510dac1ac6ae4889b94a955d3eade53d3ba3a92d133281

    SHA512

    1067c1a73cf891d651fa007f4ccc4452f32801fe3859933ef1bcc00985e35ce016fa6c601c0e3c10df2080fc9b8a776b2f18d40bd64dfb98177ab638c4b545bd

  • C:\Users\Admin\AppData\Roaming\svhost.exe

    Filesize

    235KB

    MD5

    f6f120d1262b88f79debb5d848ac7db9

    SHA1

    1339282f9b2d2a41326daf3cf284ec2ae8f0f93c

    SHA256

    1bc0575b3fc6486cb2510dac1ac6ae4889b94a955d3eade53d3ba3a92d133281

    SHA512

    1067c1a73cf891d651fa007f4ccc4452f32801fe3859933ef1bcc00985e35ce016fa6c601c0e3c10df2080fc9b8a776b2f18d40bd64dfb98177ab638c4b545bd

  • C:\Users\Default\ntuser.dat.LOG2

    Filesize

    536B

    MD5

    ae0c4e587d0042a8e1f07c43e71b5c8d

    SHA1

    4ae8397054fafd6df9fa289a444384f5703c51a0

    SHA256

    1a84fa041c4eafdffd402f5072b9f479677427a1be900d04d5558ab42178c103

    SHA512

    460209040cf32020907c4f023d09421962a509bfbc84017f6ecff529f5dd799953343f8bc074ad78406c79a97da86989394566e9ea628a1805d617b676ce1909

  • \Device\HarddiskVolume1\Boot\HOW_TO_RECOVER_DATA.html

    Filesize

    4KB

    MD5

    704a5e75caee4e3769c43e43930601b9

    SHA1

    967865725a62d69664629e348c8b5b50dff146f5

    SHA256

    6c6724aebf60bfeea0395bc84b37658448549350cc19b03cdf5d13e7f85ba484

    SHA512

    548fc008ac4441ba2a47fc4ad227b5c6eb0c5b88fca7b48bb0b6bd8903f210138978ca3cc824d5adfc0a492d263c0625354ce034f2304c50edf115480a229890

  • memory/384-809-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-817-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-808-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-164-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-822-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-811-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-133-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-163-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-810-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-816-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-537-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-818-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-819-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-820-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/384-821-0x0000000000FA0000-0x0000000001052000-memory.dmp

    Filesize

    712KB

  • memory/2988-814-0x0000000000120000-0x00000000001D2000-memory.dmp

    Filesize

    712KB