Analysis

  • max time kernel
    126s
  • max time network
    121s
  • platform
    windows7_x64
  • resource
    win7-20241023-en
  • resource tags

    arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
  • submitted
    24-12-2024 13:15

General

  • Target

    rb.exe

  • Size

    669KB

  • MD5

    ae286ff258c5ec1d15a4fd3f64875d5b

  • SHA1

    576b9e76e385b389f859ee4bde2d12776bbaedca

  • SHA256

    ce0facb2c24c71a20117e27af3aed9d6815500eeadba6e79b472bef539d82769

  • SHA512

    f2cf299e20571701ab7a7ad82103317279e8378f114e3de76b22580eb5e8263a025af1fb653b27323645e0ac63983dcbf6f609154a16e8e9d6c81531c369183b

  • SSDEEP

    12288:dQA0FfTcwpBuV2UxqDmuiLZeUaoFi2XZWfGe615HhAZV8DiKD/KeX:Tuf4wTuV2Ux3uIZeUBi2Te6HWnKrKe

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;">64FB539BA67EA38FA43DCAF3D03343FEC2D1CC8201493541C2A047A7301B39F33939674FCD93E6D4FA32BEF917894187035F70415F4BBF37590FF3FEE0056937<br>52DAA311DC039419EB1BD6DE3C0EDB4E933A578C3550B5F3B6EC9A95E8B8051870602C0B34BA5E7C3145E05AF0CDDA305FED7D2EBA1B1BF79BD4D17C05D8<br>005F5B552F69821C2FAB82BE56FAB00F97274213824C9EA62941F09AC22B38AED6854D497558E684009ACF993AD34BACD72A3CAA653D6E02B05FFB6EC208<br>6CCFA4D3B95A361B6FC1CF246CFC7F644DE1A8414A0C73D550230AC0CD39EC28ED5C7E5B254073FE4F17CD476EB3BFD59E9B0822DFA9D86F0B6BDC709E9E<br>CA47FDD419A146ED8A6BE0793DB23BFDF13BA87F72EA0CF1A4A8AAB921F93D37CA0565C215E099E0E171FD908F1FDE8DD0B1F64FA3CE38C6037E004F9C81<br>2146DDD255CC966178C88A774462282E1ECE0D9617C61419843024ADEF835D64D7153C77996E1F0BD818F7176EBB86634CA17C54B0E5E231B448E2F9D32F<br>BAE9060B6E3CF2CBF0DB159398F46321797984E86085E590EFE382AB12B219293B1E0F735C7400139E6B4F6CD5F3770D1165D06ADAC740AB2E81DAA72562<br>B1C07E5810BA6D94A4C22DCE5A91B363F3FB44B767B54D928700D07B725A426D059C75F678623C2281FCE0D5479AEF01E7DF350A5A8E8F11F6CEC655547E<br>F14DF0FB68398A76FB7C77AE5270</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>.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="[email protected] ">[email protected] </a> <br><a href="[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>

Signatures

  • MedusaLocker

    Ransomware with several variants first seen in September 2019.

  • MedusaLocker payload 1 IoCs
  • Medusalocker family
  • UAC bypass 3 TTPs 2 IoCs
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Renames multiple (299) files with added filename extension

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

  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 3 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).

  • System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Interacts with shadow copies 3 TTPs 3 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 63 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

Processes

  • C:\Users\Admin\AppData\Local\Temp\rb.exe
    "C:\Users\Admin\AppData\Local\Temp\rb.exe"
    1⤵
    • UAC bypass
    • Checks whether UAC is enabled
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:2040
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • System Location Discovery: System Language Discovery
      • Interacts with shadow copies
      PID:1736
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      PID:2876
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • System Location Discovery: System Language Discovery
      • Interacts with shadow copies
      PID:2832
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      PID:2956
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • System Location Discovery: System Language Discovery
      • Interacts with shadow copies
      PID:2700
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      PID:2888
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2000
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {4FF610E7-9C05-40F9-9A0C-4D6241F6F6EC} S-1-5-21-1163522206-1469769407-485553996-1000:PJCSDMRP\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2952
    • C:\Users\Admin\AppData\Roaming\svhost.exe
      C:\Users\Admin\AppData\Roaming\svhost.exe
      2⤵
      • Executes dropped EXE
      PID:2836

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    669KB

    MD5

    ae286ff258c5ec1d15a4fd3f64875d5b

    SHA1

    576b9e76e385b389f859ee4bde2d12776bbaedca

    SHA256

    ce0facb2c24c71a20117e27af3aed9d6815500eeadba6e79b472bef539d82769

    SHA512

    f2cf299e20571701ab7a7ad82103317279e8378f114e3de76b22580eb5e8263a025af1fb653b27323645e0ac63983dcbf6f609154a16e8e9d6c81531c369183b

  • C:\Users\Admin\Desktop\WriteRevoke.xlsx

    Filesize

    16KB

    MD5

    78aa07868bb015989fd4710998a1a061

    SHA1

    397ec086cf3f36b4337bb9c4791a54193b3238c6

    SHA256

    cb979f0bf7201db8359b8bce130ca2dbd1874b8a730217e0af0e76018c2c1d4f

    SHA512

    4c66733794262ed6628a8e667d76bce8cd6067420e8e2d7caac51ef9fa582eacd747622f63e8c0e1b1eaf88924b4a1a623feeb6425e0df2ac3433e611aa81765

  • C:\Users\Default\NTUSER.DAT.LOG2

    Filesize

    536B

    MD5

    c0a2dd40a98b967ba86a589eb0afc2d4

    SHA1

    9a5f7b1f9e8ae43841ceb6201e73c2d7db076b78

    SHA256

    00cddf1a23229fc7148f83d0135a3019a5935263ec466c3761e9ba31d662e39a

    SHA512

    4f4cf92e454efb0efeed8edffdf0fc8fdaa3bdfadbdf9dc405ad05f4f05f2aeeb02580f9361e06402291f2a256784dcf8c90e6a8f5016031f7e34583a41b3d96

  • \Device\HarddiskVolume1\Boot\HOW_TO_RECOVER_DATA.html

    Filesize

    5KB

    MD5

    058db2dc9d38352a4c6edaad606dc7a0

    SHA1

    8b79ec8da3eb6ff022dbd37e297757b2d90fe48f

    SHA256

    b8b86a6bcf66c40dea5a2f706bcacef2ca5eed88715efce7c5dc9399215792a7

    SHA512

    204ab9674d7c367d26f3d9b7be620832dea6efc9329fae53f34ba505f2d52e05ebc4fc368029f143f1a23771515fa63b0beecaeb97f836c009df5157fbc1a7c4