Analysis

  • max time kernel
    126s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    24-12-2024 13:15

General

  • Target

    B.exe

  • Size

    669KB

  • MD5

    c17b2c3980926b02136c0a5fb5dfdaa3

  • SHA1

    938eb1b7f1d985d134957443d4c43ad551727b89

  • SHA256

    4d2b250eb1691bd116eb0004a6b4526afe62631551d6d31d4da482ab5ec3b021

  • SHA512

    f770b1dfd74e58ff9d67f0e91ac070e92251598efc45863acf827098cc52f2868c7e2698fd5b0a3a178ea1d1446d32882dfd0601526dbfb27df1251d76c5881b

  • SSDEEP

    12288:dQA0FfTcwpBuV2UxqDmuiLZeUaoFi2XZWfGe615HhAZV8DjKD/KeX:Tuf4wTuV2Ux3uIZeUBi2Te6HWyKrKe

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;">9704D2A0AC40C19BC6CC5CFF9A04E8C14666001A62A99A29922AAE8AB7731D8616A1D9DA709960BD82E42681D32BD3938C23E7D8C9AC17293A132051DBE55D4D<br>1DC4B7C82A24247C69D635642197EF4ED81DD65D4E89553139F2B1A954987F038BA68DB065CB6B99AE7EEE4638A4B6BBC16A665C47440286CA422653F446<br>C68E792D61622AA940A1ABDC491F0A98975005BFA489C7D4A4F98E87A93C4F2D97B946B8CF6E2580EDF3C3DF4B6C88AB2C588133B140172D1F78020D32B7<br>570A0D5230CE985A97DC0E26B52E8F1CE93F5766CD2016A3D88F73749F4BF0230A31CF143D87E9BE7A73DD52A5E65165AC1054AA4BEE49CBAFE11F7E6B1F<br>8F8045D12B646FE1833DE28D098123641ED3A8D31BA4A2F6ECE480B2057BC0A3EBE4A5A7CD199F5A5315F9D6CDC8AEEBE5619843E604308B850AC687DE0B<br>C6985028EAE58889BC2467E3542489AC7ED58EDD34488A10BA9C1214F4980703D1B5DE167FA8BE11088DBB5CD395A2E3D7FE9490BA036381385181A7AED5<br>B831446ACC0016ACDE76EACA41CD793807A9E3393DD48ECFA7992D7B5B7F097EEFF92D79C8C66FBAAA965CB8165B03627FA74D6CF88F4018EFCA99F8954A<br>750AC5325F80E34730B8E42EA6D1366DDB6F94E87D03B6F6693E038B14CA5DCF189F3A07FC86049029328CF130F65427BDBB8F3A8EA97BFBE5850C97BC91<br>41CE6B18EB6367F40839B356A12A</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 </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
  • Medusalocker family
  • UAC bypass 3 TTPs 2 IoCs
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Renames multiple (325) 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 3 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).

  • System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Interacts with shadow copies 3 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\B.exe
    "C:\Users\Admin\AppData\Local\Temp\B.exe"
    1⤵
    • UAC bypass
    • Checks whether UAC is enabled
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:1628
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • System Location Discovery: System Language Discovery
      • Interacts with shadow copies
      PID:2360
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      PID:2192
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • System Location Discovery: System Language Discovery
      • Interacts with shadow copies
      PID:2816
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      PID:2708
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • System Location Discovery: System Language Discovery
      • Interacts with shadow copies
      PID:2840
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      PID:2588
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2248
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {1ECAD7D4-21D6-4840-A4F5-A596700BF704} S-1-5-21-312935884-697965778-3955649944-1000:MXQFNXLT\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1756
    • C:\Users\Admin\AppData\Roaming\svhost.exe
      C:\Users\Admin\AppData\Roaming\svhost.exe
      2⤵
      • Executes dropped EXE
      PID:1720

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    669KB

    MD5

    c17b2c3980926b02136c0a5fb5dfdaa3

    SHA1

    938eb1b7f1d985d134957443d4c43ad551727b89

    SHA256

    4d2b250eb1691bd116eb0004a6b4526afe62631551d6d31d4da482ab5ec3b021

    SHA512

    f770b1dfd74e58ff9d67f0e91ac070e92251598efc45863acf827098cc52f2868c7e2698fd5b0a3a178ea1d1446d32882dfd0601526dbfb27df1251d76c5881b

  • C:\Users\Admin\Documents\DenyShow.xlsx

    Filesize

    16KB

    MD5

    2c49b1687cc10dab1ec8082afaee24e5

    SHA1

    c50d2372f4cf5b314d5518a2463af1a578957489

    SHA256

    8167995ecf96589f58d19ccfe82d954231647e0b792361979d9d1b2282b88511

    SHA512

    41c3c5c41cb9c71347d911288031c7188359dcb23c3f5fae635c7d0d03c3185161cc6945475359d6fc4ac607e19ae3c3f62acb3a154e7ad5e88e1606338f6057

  • C:\Users\Default\NTUSER.DAT.LOG2

    Filesize

    536B

    MD5

    01b0f87f9f09f588dd7e266e9f07e99e

    SHA1

    a3ae23f1bc634294273e5aeccda7ab774a2e904b

    SHA256

    3afc67b0292a2ea8b57abc9fb551ba18e61f30980eb9ad62d991a78396af3bd1

    SHA512

    c8805df700f8b080b6386c7fc95d0eef2a9e9a983bbebf2feceff46f4f6b4242d62eaa8c8ad0d198bb2cfae55ebe5268f9f3b804124ba15fb01d3fb880e96fdd

  • \Device\HarddiskVolume1\Boot\HOW_TO_RECOVER_DATA.html

    Filesize

    5KB

    MD5

    86df6625c455de0f9a13a6e4d04217c4

    SHA1

    95e92994a148005ae26196701d48b1bc086bf4bc

    SHA256

    a34bb35861307ce703dfb1a033a6e120e57512d7aea475ee7172503beb5fe468

    SHA512

    fd118cff4f9a7a91f8e7b14cd1a4d57fa611e12972e64c89d7b8ba3fa816f9ba520b938f4a9be3e9bcad38417b352d47ee2e2b8362b393324e0d96708b8f157e