Analysis

  • max time kernel
    150s
  • max time network
    46s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    27-09-2022 08:53

General

  • Target

    54b8ca90cd5c6b8053a612d2e8d99bf05f427b36e7fccc0f63427e1f386db186.exe

  • Size

    669KB

  • MD5

    3981aa980e34be2f97b9f29bd5e98bdd

  • SHA1

    adb6470c8d918e772fbc590aa3850cd9e214f783

  • SHA256

    54b8ca90cd5c6b8053a612d2e8d99bf05f427b36e7fccc0f63427e1f386db186

  • SHA512

    b147389eaf789647b74a924875b14ab813e322e2a1a8a5b8366fa1805bf1c71631f7cf4179475c4e9a2826f7038c0d96793f7daa545808eb4d20b1c23ab18685

  • SSDEEP

    12288:dQA0FfTcwpBuV2UxqDmuiLZeUaoFi2XZWfGe615HhAZV8DXKD/KeX:Tuf4wTuV2Ux3uIZeUBi2Te6HWCKrKe

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; } .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;">5DE453A15768F13461B28383F8594430EA76F2A6DA4B1C38DEE7D21345B5DDF40AE72AB62683F490AF9BE290973AD07D9D0FD4812A516FA929F82708C24B8125<br>89DC366E45314DC2D481A99279E7B2A74FE63F0ED782017A22CFF9CF351F3126E361259BA9FF3948D7D35A2D19741BC3015BD6A37F62A025239039305299<br>4063108869F387484AF11B43192D66CC474DF6B788541444E3CA7C884560288745F32551B67C9A55E8E7B2B3F8EBA471B2E6A5AF1D8D2F44F37CFCA7D279<br>2A177E1A0501EDB0E84CF487781AD0886ED51E4E65F7E1F91960C2D34A8368D01865C91CF0AD290790CF323B355D03464CCE73557F563CDF8D589A7297BB<br>D8D0AE96AA39D5694300BA75443BC9DBE73B0A95B1EF6531660175A434B1558DFCF8BF07C0261019B5289CC2469640DCE581CAC992ECEF7AC496B4E340D4<br>077153729AF62793C6FFFA7C7379B6EBE7231138237F65FED5285046F9DABFAC8E9C5C1C12CB7B5E3140113ED1A03C3A78D771085BE1B109248F95F5D14E<br>98802A1F2BEB22EB4134C6D16E7F44D9D4AA805856367E3006D742A63B749369B390BC440732F7C044FBB2B0BF4002BCE1891A2DCC4D1B85B12CA0C826C4<br>AED21D3315E2B3F3FBBBE1EC4DD674656775304AFAABE4E7D51372FCBF6158228F933248E786139C161DDEC06597652522E94E07A9B89101964EC5B20CE8<br>BD0FA74962F25C464D9F937F2D39</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.

  • 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
  • Modifies extensions of user files 13 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\54b8ca90cd5c6b8053a612d2e8d99bf05f427b36e7fccc0f63427e1f386db186.exe
    "C:\Users\Admin\AppData\Local\Temp\54b8ca90cd5c6b8053a612d2e8d99bf05f427b36e7fccc0f63427e1f386db186.exe"
    1⤵
    • UAC bypass
    • 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:900
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1280
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1632
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1752
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1816
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1360
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1644
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1976
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {697FF347-5145-4437-87DE-CB3C43D94E59} S-1-5-21-3845472200-3839195424-595303356-1000:ZERMMMDR\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:556
    • C:\Users\Admin\AppData\Roaming\svhost.exe
      C:\Users\Admin\AppData\Roaming\svhost.exe
      2⤵
      • Executes dropped EXE
      PID:1284

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

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

    Filesize

    669KB

    MD5

    3981aa980e34be2f97b9f29bd5e98bdd

    SHA1

    adb6470c8d918e772fbc590aa3850cd9e214f783

    SHA256

    54b8ca90cd5c6b8053a612d2e8d99bf05f427b36e7fccc0f63427e1f386db186

    SHA512

    b147389eaf789647b74a924875b14ab813e322e2a1a8a5b8366fa1805bf1c71631f7cf4179475c4e9a2826f7038c0d96793f7daa545808eb4d20b1c23ab18685

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

    Filesize

    669KB

    MD5

    3981aa980e34be2f97b9f29bd5e98bdd

    SHA1

    adb6470c8d918e772fbc590aa3850cd9e214f783

    SHA256

    54b8ca90cd5c6b8053a612d2e8d99bf05f427b36e7fccc0f63427e1f386db186

    SHA512

    b147389eaf789647b74a924875b14ab813e322e2a1a8a5b8366fa1805bf1c71631f7cf4179475c4e9a2826f7038c0d96793f7daa545808eb4d20b1c23ab18685

  • memory/900-54-0x0000000076121000-0x0000000076123000-memory.dmp

    Filesize

    8KB