Resubmissions

30-11-2023 10:51

231130-mx5qxsah79 10

29-06-2023 20:59

230629-zs72psfa95 10

29-06-2023 16:29

230629-tzp7ksec27 10

Analysis

  • max time kernel
    141s
  • max time network
    136s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230621-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230621-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29-06-2023 16:29

General

  • Target

    medusa.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;">6619E7B70FDF943D0D756A1491F8B00F45EA009AE676B1E622ABC46BD062A2180446F454EDC636FF745CE90D97649DCC76780DF7594199899E116AA5B740C78A<br>0271624A0985CFBBA26B6A0F7C140F31C495E34BAFE0DF5D0E796AEFDF63C558592C7D42617E798245D65FC7EE5EC099E3BBD55FB3571C0DB0ACBB6FE30B<br>491C7E2E478B6788D5E1CF98E065F4511DCAB5001B5DF83B9EC9395D6DC729F231BF1AB8B9D90D36F1070B28E7E027F929864DA11A2D5EED23266875C654<br>0AED0820465C5A563AC4C5B8262C5E25D9EACA5310800F1BC0EB86496C447B740DCD2FAA678675C7FBA159AFA48B406D008B69DC0DC88A62DD4C51223088<br>2D9664BB9403BAE5794B73B9057FAD82CB3CCF8561F4F1BCD51501019B965168BECBCA40DB5E0A62BC91F5E5D9B559F14544301412FDF2E7D2AAF81C27CB<br>D3BE585F0B121401422495E07CF7EA41B13E21796229BD863D8278B6308A9807929F571FF69073AB4681F40ABB154286799C9208898356164D2C1B7E990B<br>45F6CE6C78B5D0C97D73C9E4BC2D9CB63DACF8B00128E7DDF03AD113AB8D4096233328C3339EB425A72DD8C1C66C10C8C80DC57A39ED1ACD930D52BB1EC1<br>D9847BC7B8B450DFB096070CF03F0397E0DF1218D47C5430386FE8AF0D2472141CEFEDC54284EADD0841677D6EF057D60D4D92995007484D14E3F71FE0C4<br>8DD30DC6BFBD1713316E04324D7A</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
  • Renames multiple (210) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

  • Modifies extensions of user files 8 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 17 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.

  • Drops file in System32 directory 8 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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\medusa.exe
    "C:\Users\Admin\AppData\Local\Temp\medusa.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:1440
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:348
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:832
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4436
  • C:\Windows\System32\svchost.exe
    C:\Windows\System32\svchost.exe -k netsvcs -p
    1⤵
    • Drops file in System32 directory
    PID:4972
  • C:\Users\Admin\AppData\Roaming\svhost.exe
    C:\Users\Admin\AppData\Roaming\svhost.exe
    1⤵
    • Executes dropped EXE
    PID:4068

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

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

    8ed60a818163f21a666f6f182ec6bac3

    SHA1

    c299c3b9c74286fde689e5d2f0f1d58fb0437165

    SHA256

    ee387049b6f1f3f81b2cdffe7736fff9d029d5c51c76fb780ed0c1d0684bf3ef

    SHA512

    3ca30623977e214170522fc0d33c961cf13e9718d77f69dbee3681b43cf293227b9df57d0098e4821973d2e7c83e1296a629e1aad984b9e5669c4480de75616f

  • \Device\HarddiskVolume1\Boot\HOW_TO_RECOVER_DATA.html

    Filesize

    4KB

    MD5

    a1808aba85d47f4d624181391d0ded9b

    SHA1

    26e00e07541b814bdaac65cf7b7dbf1864de1f0c

    SHA256

    5a288a2998ac7bd5c69a0844c4f8bca0cd8b230afd99a59f7bde8b56a29cc957

    SHA512

    c440171ee630982d0e57f2415cf480392631bdc0dd9344243c5b22a649a0f81936c14c3dc09271e4d916c8fc9c7422423ac3155771773d8aafa732ba4e0930b1

  • memory/1440-794-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-810-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-792-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-793-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-134-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-247-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-246-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-814-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-808-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-809-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-791-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-811-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-812-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/1440-813-0x0000000000D70000-0x0000000000E22000-memory.dmp

    Filesize

    712KB

  • memory/4068-806-0x0000000001000000-0x00000000010B2000-memory.dmp

    Filesize

    712KB