Analysis

  • max time kernel
    151s
  • max time network
    46s
  • platform
    windows7_x64
  • resource
    win7-20220331-en
  • submitted
    08-04-2022 10:50

General

  • Target

    dbac4f2fffcb4e09aad772895647e8f161b1ac713592fe47c5e8207c85722f13.exe

  • Size

    669KB

  • MD5

    3a43bb428e23e8059c9a3fbde9707de2

  • SHA1

    edbca9b297c2ce981bcb6c8a20107c204045d523

  • SHA256

    dbac4f2fffcb4e09aad772895647e8f161b1ac713592fe47c5e8207c85722f13

  • SHA512

    c02648de56128a758873952ffcac982bf4463bc9c7cab9605e2f0cf77eb4304e39a9076494f4127718356e4d5250084353b27459c40ae8f30ac7cb5150f2ae1e

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;">2AB29796FF25ECE250009ED30416B553F2391478651A7775AC5DB1004C546459ACB5105DAC2B00C2069DD66EF6962CB529B730239C578591A1D36158E7B46EBE<br>6594D728B8E79834840A2B6D5007DD95BCC818FA9B28A4A80061299C79C4D2F550803CC0DE0D340046893E74C61AFD8DD31CE71B24FFC4DFF6DD37FDC307<br>B9E9FD6EDCDAAC410B30CD9251149CE4B3D5233999784B32F248F4692A0DE1E410E90BACD9E6EA62D1C656635D2F2DD2E31CABAB699D2A79B55E9F5D1FED<br>898C7A72076091FBD5E2D3D4AB23D4D105E14CCA5B4BE6FB0AF7217A0C70A0BCBDC5181225F17C6606B918336FFDF093D16367531D40A59FF0402D79AC44<br>3344CD1D9945C23A20027664F3571A81D2DAB85D079E01259F71922396319DF62FA113A6791BD179156B69E504C58B21AADE06B995E95959C5B0998465D0<br>542D370FCA6BDF050ABA9DF8E66061366D3BDD0229E58A98558FF109EB5B575FF140B02B3B423F84D57A6415F705F0FFEB568F2919D76490CF8054B688A0<br>F86BCE7A3D08E16B626DC6A331264D7866873422DC4C8E2C3FE218BAF4ECE2907F316F7F15C33410374E2764152BE73FF951A843906DBC6BF393DC4B7E23<br>FFEAA889BA73D8BE09E2FCD1AAC999A6DF2E0B55C08C79059C73D8BCF87BBF019CC39BE915120E0B61B7F26DBAC198F2B678CC744699F507FB76BFA240DB<br>77C20D5EA1F7E609F51E01CA4B66</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 7 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\dbac4f2fffcb4e09aad772895647e8f161b1ac713592fe47c5e8207c85722f13.exe
    "C:\Users\Admin\AppData\Local\Temp\dbac4f2fffcb4e09aad772895647e8f161b1ac713592fe47c5e8207c85722f13.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:812
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1252
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1764
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1756
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1080
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1896
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1160
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1664
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {7E9F853D-27FE-4554-939B-03CF17E2E4B4} S-1-5-21-3422572840-2899912402-917774768-1000:VFSHTLAO\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1204
    • C:\Users\Admin\AppData\Roaming\svhost.exe
      C:\Users\Admin\AppData\Roaming\svhost.exe
      2⤵
      • Executes dropped EXE
      PID:564

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

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

    Filesize

    669KB

    MD5

    3a43bb428e23e8059c9a3fbde9707de2

    SHA1

    edbca9b297c2ce981bcb6c8a20107c204045d523

    SHA256

    dbac4f2fffcb4e09aad772895647e8f161b1ac713592fe47c5e8207c85722f13

    SHA512

    c02648de56128a758873952ffcac982bf4463bc9c7cab9605e2f0cf77eb4304e39a9076494f4127718356e4d5250084353b27459c40ae8f30ac7cb5150f2ae1e

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

    Filesize

    669KB

    MD5

    3a43bb428e23e8059c9a3fbde9707de2

    SHA1

    edbca9b297c2ce981bcb6c8a20107c204045d523

    SHA256

    dbac4f2fffcb4e09aad772895647e8f161b1ac713592fe47c5e8207c85722f13

    SHA512

    c02648de56128a758873952ffcac982bf4463bc9c7cab9605e2f0cf77eb4304e39a9076494f4127718356e4d5250084353b27459c40ae8f30ac7cb5150f2ae1e

  • memory/564-62-0x0000000000000000-mapping.dmp

  • memory/812-54-0x0000000075B01000-0x0000000075B03000-memory.dmp

    Filesize

    8KB

  • memory/1080-58-0x0000000000000000-mapping.dmp

  • memory/1160-60-0x0000000000000000-mapping.dmp

  • memory/1252-55-0x0000000000000000-mapping.dmp

  • memory/1756-57-0x0000000000000000-mapping.dmp

  • memory/1764-56-0x0000000000000000-mapping.dmp

  • memory/1896-59-0x0000000000000000-mapping.dmp