Analysis

  • max time kernel
    177s
  • max time network
    201s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220113
  • submitted
    01-02-2022 15:21

General

  • Target

    fc12de55f162cd0645e6f7299f6160d1a3b4c3a665efaf4f8bd891d8139d159e.exe

  • Size

    678KB

  • MD5

    7405efcdd3e931cde430317df1c00131

  • SHA1

    69c1527fbd840eee87821328ecf1453984ddc73e

  • SHA256

    fc12de55f162cd0645e6f7299f6160d1a3b4c3a665efaf4f8bd891d8139d159e

  • SHA512

    a54442e4ceb718491486653634640dfcfb79c535fde92b7234fbca328c6aeb1cc9b552ae16fe557055eb52ad0ef20e30a5caedd94dd3d89ea647fc4430e48d72

Malware Config

Extracted

Path

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;">898BD4699E03DCC292167CC63343AB4A7AABB91436EEFE26051ABDEDF65C4BA3C4393E0CC35034A7E766C8A55F704B2591810B28DB0A0580634967A326BF759A<br>323AB93CE494842166A38B208E97CB7B4A5D59B62451C3A0AD30D5B1EA3BC13E84D2699175F982F3DD4AAE13221210E416060FC31A577618028B01D49E67<br>052D78A9BF09BDFDFDEBB73CAB4AB12C2D681DCEDA0198FD48E7F2A396F768D2FF2462B98A5E98B525575F962DA3A8C1C5C814B15F08DC9F4FCCDB64FE27<br>17459AE06B20C6478B63F4865C5BE5F64BF409317535E492B7069035C43CF77D04C3A4D6B57A78E6A00129A08E5504E922E772472412CAC569310BE3384F<br>F556C3A68D7B05F011DDCB3BC4474A7C918FB796DC1D53930569834D00A335ACD3AB41358D4411F4B9C8ED58A05BECE8EEC618052FFAC895A4C216D66160<br>07A95BC2A812E9105401CF88BE2EFCB389F4C86D9DA28FD56F25101AF70A0683C94CA8567B02274AD8B1C3BE71BA054DF21513E83AB2A793FB606B48B216<br>47AB482CC7EA9792A347FC555753510A9E43589E452EFA994024B826081940E1D37F7970CBEC73BD4B47EFE7AE1109882958F220045171FFFBF46D31D022<br>CBC77E8125415607B948C7CF99471B493351E8B636879F6FFBDC600EC44C95778A69C78B1F3950D092E430A58FD1315750562D6B7E8C499608870097DFEE<br>1B37F6C2D1391CC328CECF924DB7</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> YOUR FILES ARE SAFE! JUST MODIFIED ONLY. (RSA+AES) <br><br> ANY ATTEMPT TO RESTORE YOUR FILES WITH THIRD-PARTY SOFTWARE<br> WILL PERMENANTLY DESTROY YOUR FILE.<br> DO NOT MODIFY ENCRYPTED FILES. DO NOT RENAME ENCRYPTED FILES.<br><br> NO SOFTWARE AVAILABLE ON INTERNET CAN HELP YOU. WE ONLY HAVE<br> SOLUTION TO YOUR PROBLEM.<br><br> WE GATHERED HIGHLY CONFIDENTIAL/PERSORNAL DATA. THESE DATA<br> ARE CURRENTLY STORED ON A PRIVATE SERVER. THIS SERVER WILL BE<br> IMMEDIATELY DESTROYED AFTER YOUR PAYMENT. WE ONLY SEEK MONEY<br> AND DO NOT WANT TO DAMAGE YOUR REPUTATION. IF YOU DECIDE TO<br> NOT PAY, WE WILL RELEASE THIS DATA TO PUBLIC OR RE-SELLER.<br><br> YOU WILL CAN SEND US 2-3 NON-IMPORTANT FILES AND WE WILL<br> DECRYPT IT FOR FREE TO PROVE WE ARE ABLE TO GIVE YOUR FILES<br> BACK.<br><br> <!--text data --> <hr> <b>Contact us for price and get decryption software.</b><br><br> <a href="">http://gvlay6u4g53rxdi5.onion/8-DYIkMDYTNMZw78F1u6LJFm1lvbyUyGMM-D4ucYsp1QGmZZrCY8Ztwf4IL5vwWy974</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> <b>If you can't use the above link, use the email:</b><br> <a href=" [email protected] ? "> [email protected] </a> <hr> <a href=" [email protected] ? ">[email protected] </a> <hr> MAKE CONTACT AS SOON AS POSSIBLE. YOUR DECRYPTION KEY IS ONLY STORED <br> TEMPORARLY. IF YOU DON'T CONTACT US WITHIN 72 HOURS, PRICE WILL BE HIGHER. </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\fc12de55f162cd0645e6f7299f6160d1a3b4c3a665efaf4f8bd891d8139d159e.exe
    "C:\Users\Admin\AppData\Local\Temp\fc12de55f162cd0645e6f7299f6160d1a3b4c3a665efaf4f8bd891d8139d159e.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:4040
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2592
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3584
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:548
  • C:\Windows\System32\WaaSMedicAgent.exe
    C:\Windows\System32\WaaSMedicAgent.exe d0e7bac81cc266fd8a08826450578e80 WFHYrf6NjEyw3sxbHvvmRw.0.1.0.0.0
    1⤵
    • Modifies data under HKEY_USERS
    PID:3680
  • 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:3520
  • C:\Users\Admin\AppData\Roaming\svhost.exe
    C:\Users\Admin\AppData\Roaming\svhost.exe
    1⤵
    • Executes dropped EXE
    PID:2024

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

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

    MD5

    7405efcdd3e931cde430317df1c00131

    SHA1

    69c1527fbd840eee87821328ecf1453984ddc73e

    SHA256

    fc12de55f162cd0645e6f7299f6160d1a3b4c3a665efaf4f8bd891d8139d159e

    SHA512

    a54442e4ceb718491486653634640dfcfb79c535fde92b7234fbca328c6aeb1cc9b552ae16fe557055eb52ad0ef20e30a5caedd94dd3d89ea647fc4430e48d72

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

    MD5

    7405efcdd3e931cde430317df1c00131

    SHA1

    69c1527fbd840eee87821328ecf1453984ddc73e

    SHA256

    fc12de55f162cd0645e6f7299f6160d1a3b4c3a665efaf4f8bd891d8139d159e

    SHA512

    a54442e4ceb718491486653634640dfcfb79c535fde92b7234fbca328c6aeb1cc9b552ae16fe557055eb52ad0ef20e30a5caedd94dd3d89ea647fc4430e48d72

  • memory/3520-147-0x000001847FE50000-0x000001847FE54000-memory.dmp

    Filesize

    16KB