Analysis

  • max time kernel
    175s
  • max time network
    30s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    09-12-2022 15:05

General

  • Target

    fc0f65213e7ad5960378433efc55642c116c750e10cb881ed7297f361b6be7dd.exe

  • Size

    669KB

  • MD5

    489e246b8f55137cd70e4b2d718ff85f

  • SHA1

    444e3fd11ac385ab333db41420e5c4fd2e47a5ba

  • SHA256

    fc0f65213e7ad5960378433efc55642c116c750e10cb881ed7297f361b6be7dd

  • SHA512

    25301655af73d40156d5761883198e519887d6dd24c282602a43cba8d029e108a26a29fa9b99e80c559a2916e311a6726dfbe8ef43c75dac503a3d33fa8464f7

  • SSDEEP

    12288:dQA0FfTcwpBuV2UxqDmuiLZeUaoFi2XZWfGe615HhAZV8DRKD/KeX:Tuf4wTuV2Ux3uIZeUBi2Te6HWMKrKe

Malware Config

Extracted

Path

C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\how_to_back_files.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; word-break: break-all; } .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;">9E13FB11F82770CF72449021B0FD2B4B7DA12DE0DC72BBD3EFC3A5BF8DF00CA8746231B0C8178109DDCECD85AA78605662EF782A5698EACDD4FDDA6A2478D1B9<br>F2CD73FED589944A4A9665AB1C7E5F219A7169E650B774F5BE70BD053151CCA12B486224EB8F9F05A10950D225F717ABB2E46E465CC862D7AD6D2428709B<br>BD639494D666EDAA121D609C7669426FDF25BB342E8D47C64136CC503E2689596D80C834AF5CD413941CBDC694C48BD9D3A055CE418F754F313485D9CBAA<br>06B70C643B64710F4830235DFB46007C66AA6361079D83630D64E264B12ADFAEC5ABF7A4E202F03C8B369CBFDB12CDD5F3C8F509A53EFA937918D2F1206E<br>2E84D5FB295684FAC5C6B2E38C3E06B1C1D243715D3FFD6B65E70AA96828911E614BF9CDFA240016242FA93DBAFB6A16F9FB5D32B87E7B63F4E69C86D480<br>87C91239C64EC161698403C4874EA91C26321FADB441A85484761B05B396BDE50E5D438C92251C26EFF9212BB2036170081AF5D6D45DAC3887C49C50C22D<br>DD7488CCA3DBCA76BC516F0664D33B05E10708CD2D84EBBD10F2955587D266733EDC12620DB4DE4178A59C5A86369B6D242BB951678BE1C6B2EDCB61E842<br>2C2A97C4CD8F73D79295E5DA6BA3F63A8BF2F1D2E123FD15C2A4F6FA28E76375A0896C88FCCFAB36643B88E8AD644EEBD6EF4E6BFF33AD10BD62B7FD3315<br>4894C3CE4EAD2813F93C729C4122</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 2 IoCs
  • UAC bypass 3 TTPs 2 IoCs
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Executes dropped EXE 1 IoCs
  • 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 63 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs
  • System policy modification 1 TTPs 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\fc0f65213e7ad5960378433efc55642c116c750e10cb881ed7297f361b6be7dd.exe
    "C:\Users\Admin\AppData\Local\Temp\fc0f65213e7ad5960378433efc55642c116c750e10cb881ed7297f361b6be7dd.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:1228
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1988
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1156
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:680
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1560
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1620
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1932
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1500
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {AA18A29B-0994-481F-9882-A5BC22D0EF64} S-1-5-21-3385717845-2518323428-350143044-1000:SABDUHNY\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:832
    • C:\Users\Admin\AppData\Roaming\svhost.exe
      C:\Users\Admin\AppData\Roaming\svhost.exe
      2⤵
      • Executes dropped EXE
      PID:1976

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

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

    Filesize

    669KB

    MD5

    489e246b8f55137cd70e4b2d718ff85f

    SHA1

    444e3fd11ac385ab333db41420e5c4fd2e47a5ba

    SHA256

    fc0f65213e7ad5960378433efc55642c116c750e10cb881ed7297f361b6be7dd

    SHA512

    25301655af73d40156d5761883198e519887d6dd24c282602a43cba8d029e108a26a29fa9b99e80c559a2916e311a6726dfbe8ef43c75dac503a3d33fa8464f7

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

    Filesize

    669KB

    MD5

    489e246b8f55137cd70e4b2d718ff85f

    SHA1

    444e3fd11ac385ab333db41420e5c4fd2e47a5ba

    SHA256

    fc0f65213e7ad5960378433efc55642c116c750e10cb881ed7297f361b6be7dd

    SHA512

    25301655af73d40156d5761883198e519887d6dd24c282602a43cba8d029e108a26a29fa9b99e80c559a2916e311a6726dfbe8ef43c75dac503a3d33fa8464f7

  • memory/680-57-0x0000000000000000-mapping.dmp

  • memory/1156-56-0x0000000000000000-mapping.dmp

  • memory/1228-54-0x0000000075C41000-0x0000000075C43000-memory.dmp

    Filesize

    8KB

  • memory/1560-58-0x0000000000000000-mapping.dmp

  • memory/1620-59-0x0000000000000000-mapping.dmp

  • memory/1932-60-0x0000000000000000-mapping.dmp

  • memory/1976-62-0x0000000000000000-mapping.dmp

  • memory/1988-55-0x0000000000000000-mapping.dmp