Analysis

  • max time kernel
    151s
  • max time network
    45s
  • platform
    windows7_x64
  • resource
    win7-20220331-en
  • submitted
    08/04/2022, 10:50

General

  • Target

    a3fe92224060ec183a25296999c18d4f86149649f1a701ac91b04d73e8678495.exe

  • Size

    669KB

  • MD5

    7de20a779f98016a31f2d47a64deb30a

  • SHA1

    174375f8f540cb109cb8efea1cab30fc4155869d

  • SHA256

    a3fe92224060ec183a25296999c18d4f86149649f1a701ac91b04d73e8678495

  • SHA512

    bd3ff7efbf91e51d51ba8cb9529587500df721d9e631322f70a760b71f1fa0d8f2fecf4d0ab5ad2162ba75ae65aa5970edf8c647cbb8272bfc04a04189d31efb

Malware Config

Extracted

Path

C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\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;">FBA9CB8A62A73DE23BC6483C86B61FF21D8FF736EE9CB4E0C43CDF4A8BA4F9E02A4F578C8A3450F6156241FF558E0206B3042D83971143E41AD6B2255FD0CF72<br>9A20F54A18672D6628427A56758E236A4E60A334909DA16B3ED660EAADC2186222CA7C0A679D4F779407159D3036970733928A9E78C07386E0F65A0CA130<br>B70EAB31DCFF5C66282E86E9E74AE61F9F8F80718DB3452C96CCD7CE00B7F5EA790324B37C8B55CDAAF3846E8FFE41107F380B84A316D1A1A6F496D3326C<br>D2DDE5B78F16FAABC8B1E2482CF3C386389DCA78F56782A7A80BDBE95280851605E7E64A513B3BDE92CB3F56A1B2A34625DFF1F1B2B69474B8A85A505863<br>FEF730B79F9FFE7C9F05CAB216847A5E17C41F81C105113CDF1A2A2B02714B21B441F7583A1F44D3309423C4846BFDB499484FAB6B7D7E6C05C8B4317DBF<br>E1F4BC9B228E5505A2F9636A4D34D026ACCD58D16DE1E5184BD292707835553AB5C0CA9B58377E5BA8E25AC966D28D8C8BC1747D6E404231AC1882958538<br>BF387F61E7222142F0BC55F46C5DD086F6C0A46AE28B85F949A472BCFDB647335C997ED9B67B886A8DF96126CB672FFC2FA64BFE2B4990BBD0F52AB20DFA<br>0E2095695815D2D77418B7BA60DDE75D56F3F007D5901A70B54ADC2A100A6C419664AB50DAC042D82E8FFE56F57FED13AE83DDB967AADB4FA8A42C5CEA0E<br>73EF440764AE17928945925C3648</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
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Executes dropped EXE 1 IoCs
  • Modifies extensions of user files 8 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 63 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs
  • System policy modification 1 TTPs 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a3fe92224060ec183a25296999c18d4f86149649f1a701ac91b04d73e8678495.exe
    "C:\Users\Admin\AppData\Local\Temp\a3fe92224060ec183a25296999c18d4f86149649f1a701ac91b04d73e8678495.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:876
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1120
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1168
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:748
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2032
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1144
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1972
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2012
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {B4ED4087-2B7F-4A65-A901-BFA72D20202E} S-1-5-21-3422572840-2899912402-917774768-1000:VFSHTLAO\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1624
    • C:\Users\Admin\AppData\Roaming\svhost.exe
      C:\Users\Admin\AppData\Roaming\svhost.exe
      2⤵
      • Executes dropped EXE
      PID:1540

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

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

    Filesize

    669KB

    MD5

    7de20a779f98016a31f2d47a64deb30a

    SHA1

    174375f8f540cb109cb8efea1cab30fc4155869d

    SHA256

    a3fe92224060ec183a25296999c18d4f86149649f1a701ac91b04d73e8678495

    SHA512

    bd3ff7efbf91e51d51ba8cb9529587500df721d9e631322f70a760b71f1fa0d8f2fecf4d0ab5ad2162ba75ae65aa5970edf8c647cbb8272bfc04a04189d31efb

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

    Filesize

    669KB

    MD5

    7de20a779f98016a31f2d47a64deb30a

    SHA1

    174375f8f540cb109cb8efea1cab30fc4155869d

    SHA256

    a3fe92224060ec183a25296999c18d4f86149649f1a701ac91b04d73e8678495

    SHA512

    bd3ff7efbf91e51d51ba8cb9529587500df721d9e631322f70a760b71f1fa0d8f2fecf4d0ab5ad2162ba75ae65aa5970edf8c647cbb8272bfc04a04189d31efb

  • memory/876-54-0x0000000075AA1000-0x0000000075AA3000-memory.dmp

    Filesize

    8KB