Analysis

  • max time kernel
    129s
  • max time network
    126s
  • platform
    windows7_x64
  • resource
    win7-20231215-en
  • resource tags

    arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
  • submitted
    31-12-2023 00:08

General

  • Target

    2120cf93b6be39884f951ee2a31c5999.exe

  • Size

    669KB

  • MD5

    2120cf93b6be39884f951ee2a31c5999

  • SHA1

    317b695da0ece90979f0400c2c7800e50bec8bb9

  • SHA256

    c5bef2a489740192a0b2c34cdc2fd954d0b8d5fabcbe0ecb8b78f9301e5a30a6

  • SHA512

    3038b27dcc263675a642f77d9dbaaff921c3a56f160051df44619dbafcd5d108db1c6caeacb70179c511e284035d329f29c34dd19500d2bd4006d2f86ee1dc33

  • SSDEEP

    12288:dQA0FfTcwpBuV2UxqDmuiLZeUaoFi2XZWfGe615HhAZV8DKKD/KeX:Tuf4wTuV2Ux3uIZeUBi2Te6HWjKrKe

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;">DBAB6D4BB6CB08F4DBC07DEB304DF9070E16421000A965FADCF289C82B97FCC9E44DFE4C49A4E44811008DF23B1ED925672A1C2A9038C9A3A9A2248C61B980D5<br>F8CDE03508ADFF32F7A05400238FCF2C9E17D5CCBB0323C574D41474EDD9B09071FA94BD9496E4E7C37AFCABE2F6A955AD5365FC91968419068C4E819C46<br>9262FF434AF2D29F2EAFA76EDF835C837AC6870F32F67BA11E32799F7FDB52FD1C19312CFC6147E4E8BEEDC7C0E1C52F5EABAA2A0D466B815517A08B0A84<br>45B4E1314D660D6B5534E377D47929C1876269F85B92058B1755705DAA50A3549B6B2372CAD5B3ADE51684084D202AE025EA51CD02F05F352A5BDE58686C<br>E578B149341328C21781FBB6CD4EE36E5C7ED454023431972453F68B4F9DD5D8CD0AED6B341C4EF34702060AB963DFFC97C0113E384A0C79666015A59E05<br>D1581F4FE49A2A7B095DC7FBC0F329FF47D6A22E89D4E862B82A6CAE316844EB194706EB2EE5563A65D5AD3A4C6F8840C6AF6FA9C6EE45E5081836C7C21B<br>F91E2CF433855A2D45DC18CF4B6A2DF8962D3D56ACF13809C1EA9197AECBA9DB349F1690FFEB7D65A700313BB75A4CC47C16A4D6410CC47992E65205C7A1<br>9110407AF0088EC0102531219F0E1475813395B0A484F5C361952D62F887628924A4E59246BE1CFE6C46E1D4F986CA51FE43E9E3F839298DB80ADF8E93A8<br>DC02E0CDF4AFC94957EF9D00693B</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</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
  • UAC bypass 3 TTPs 2 IoCs
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Renames multiple (333) 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 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).

  • 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 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\2120cf93b6be39884f951ee2a31c5999.exe
    "C:\Users\Admin\AppData\Local\Temp\2120cf93b6be39884f951ee2a31c5999.exe"
    1⤵
    • UAC bypass
    • Checks whether UAC is enabled
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:2432
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:616
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1076
    • 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:2848
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:2204
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2628
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1712
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {E310F6C0-3BF0-4262-9BEF-1A1C040A1C50} S-1-5-21-3427588347-1492276948-3422228430-1000:QVMRJQQO\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2596
    • C:\Users\Admin\AppData\Roaming\svhost.exe
      C:\Users\Admin\AppData\Roaming\svhost.exe
      2⤵
      • Executes dropped EXE
      PID:2496

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    669KB

    MD5

    2120cf93b6be39884f951ee2a31c5999

    SHA1

    317b695da0ece90979f0400c2c7800e50bec8bb9

    SHA256

    c5bef2a489740192a0b2c34cdc2fd954d0b8d5fabcbe0ecb8b78f9301e5a30a6

    SHA512

    3038b27dcc263675a642f77d9dbaaff921c3a56f160051df44619dbafcd5d108db1c6caeacb70179c511e284035d329f29c34dd19500d2bd4006d2f86ee1dc33

  • C:\Users\Default\NTUSER.DAT.LOG2

    Filesize

    536B

    MD5

    3a4928d74ed244bfc2aad6c7cb49e3df

    SHA1

    da223b86785cc3df669c316ab60b50f489d94016

    SHA256

    181148c75aff9e7176dbd4ded971057280edabf251df728030dbb72362452be4

    SHA512

    afb94544d2acff879ffdf864ad4487792899712131b82a38739841573601e291c250ea1c7b661812ed1ffc5a6bf5279acc6c1911e6919c93085d9510225ee2df

  • \Device\HarddiskVolume1\Boot\HOW_TO_RECOVER_DATA.html

    Filesize

    5KB

    MD5

    c21e4a5be0ea5ffde78f872c39f720e2

    SHA1

    1d9209fd675bde427577ad28afb05c70455760e7

    SHA256

    8b39331bc152079f865c185d9f6aa6b1c5fee49e546d6cd56e4fe8f6cc1df567

    SHA512

    e2ef69f5f5edaab18befa46140007e9ca91a507dae3e0d9a46ce86c3acc55217a329bdbddab7a3c07d8db12ca777ef87b362b25bdc2b103f67d04d64cc3b69e6