Analysis

  • max time kernel
    130s
  • max time network
    125s
  • platform
    windows10_x64
  • resource
    win10-en-20211104
  • submitted
    29-11-2021 07:51

General

  • Target

    46c9bed88ac58193eb8c1b2ca91cfede01a74dafa4315ff57b7d3bb0c8a779cd.exe

  • Size

    669KB

  • MD5

    f3f4909771e23ec301ae2a2c5945f25c

  • SHA1

    0cbbc30d64966d7108f3404979058285d8ed250c

  • SHA256

    46c9bed88ac58193eb8c1b2ca91cfede01a74dafa4315ff57b7d3bb0c8a779cd

  • SHA512

    fd928762c0ddc8301092504874b0ff4ad81a65c4cd385a493db2a5dcce786bcb2f915869958a6618ba10ac443ac6af6a458fed5ec2aedc52e0c649d9d72c27ad

Malware Config

Extracted

Path

C:\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;">DF340C68DAAA34B5ADE1D3D1F80ECFA2C36B75F2A1003E134503BCBF7331069890CA91263A952C88034E15092DC0C80A962678629477A4EBF9FE926C4343FCE1<br>D40695388BF7C02F06CF8D20E5AC712C18941CC7C979EB3F22E0D92912DF57FB8007C6223210552B6A12DA21D5B48486286193A0461B4834C076F98D551D<br>786AA9661F181055B1C6BAE62DD3A01529202AAD5E6741B2D89D89151213CFE77E63B3CFD39A2F7D0213C099975F9E479E2530C34C1F06A0BACBB52FD4A7<br>19E2EA509CD6A9D0A0A1137B92D1AA85CC7F5E4C4F74588E33801F30FC675533B6289B238EA061A7475788CC4EC9D10664CA9E9B28A635F52DB98CF107A5<br>C3267A640A299B81490FB435B504098A95B424DC38CCC154648F7DAE0487E93AFE1231A912759694B1C720408181B52A14F0C0814087F5FB1864059EC4F0<br>40E221ACC6D1A17B6B3AF28523FF78959D3253AAF40C941CE076480B89D96755189EDCB2A04AD3C1AB3E6831A7CDD2A327DEF796ECEA2E6F4FFCF9645F26<br>3220E04E818986A37B848B50A32E32F9F23BC32188467B137171D20FD9CEB5CB8295B8349284EDBEC8363E30BF59703A2DEF3D402938C21E04620C1E04EE<br>9837EAF750403D986617BF4A03B60467C6BD06E0269C9508091CEE9C28604B4345A62AF5E4FADFEF2C4D6FC0158E90854445F96B153130EE912F3959DCFE<br>CE26241F6FAF25D4E9BB5926E14C</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>.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.

  • UAC bypass 3 TTPs
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies extensions of user files 2 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.

  • Interacts with shadow copies 2 TTPs 3 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 18 IoCs
  • System policy modification 1 TTPs 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\46c9bed88ac58193eb8c1b2ca91cfede01a74dafa4315ff57b7d3bb0c8a779cd.exe
    "C:\Users\Admin\AppData\Local\Temp\46c9bed88ac58193eb8c1b2ca91cfede01a74dafa4315ff57b7d3bb0c8a779cd.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:2736
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:4088
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3736
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:2924
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1520
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:2688
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3688
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1280

Network

MITRE ATT&CK Enterprise v6

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Downloads

  • memory/1520-121-0x0000000000000000-mapping.dmp

  • memory/2688-122-0x0000000000000000-mapping.dmp

  • memory/2924-120-0x0000000000000000-mapping.dmp

  • memory/3688-123-0x0000000000000000-mapping.dmp

  • memory/3736-119-0x0000000000000000-mapping.dmp

  • memory/4088-118-0x0000000000000000-mapping.dmp