Overview

overview

10

Static

static

10

05b51b5f41...73.exe

windows7-x64

10

05b51b5f41...73.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    128s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-20230712-en
  • resource tags

    arch:x64arch:x86image:win7-20230712-enlocale:en-usos:windows7-x64system
  • submitted
    22/08/2023, 08:57

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General

  • Target
    05b51b5f41e483020d14126522a13c69b75e5cbb093a78980877bb60cf778873.exe
  • Size 666KB
  • Sample230822-kwsnvsbb74
  • SHA256 05b51b5f41e483020d14126522a13c69b75e5cbb093a78980877bb60cf778873
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
medusalockerevasionransomwarespywarestealertrojan

Malware Config

Extracted

Path

  • \Device\HarddiskVolume1\Boot\!-Recovery_Instructions-!.html

Ransom Note
  • <!DOCTYPE html> <html lang="en"> <head> <meta charset='utf-8'> <meta name='viewport' content='width=device-width,initial-scale=1'> <title></title> <style> html, body { background-color: #1a1a1a; } body { padding-top: 1rem !important; font-size: 1.3rem; color: white; } #text h2 { font-size: 2rem; font-weight: 600; line-height: 1.125; } .container { max-width: 1152px; flex-grow: 1; margin: 0 auto; position: relative; width: auto; } .box { background-color: #242424; display: block; padding: 1.25rem; border: 1px solid #303030; } a { color: #00b4d8; text-decoration: none; } a:hover { text-decoration: underline; } li { margin-bottom: 10px; } </style> </head> <body> <div class='container'> <div class='box'> <div id='text'> <h2>If you get this message, your network was hacked!</h2> <p>After we gained full access to your servers, we first downloaded a large amount of sensitive data and then encrypted all the data stored on them.</p> <p>That includes personal information on your clients, partners, your personnel, accounting documents, and other crucial files that are necessary for your company to work normally.</p> <p>We used modern complicated algorithms, so you or any recovery service will not be able to decrypt files without our help, wasting time on these attempts instead of negotiations can be fatal for your company.</p> <p>Make sure to act within <span style='color:#f4a261;'>72</span> hours or the negotiations will be considered failed!</p> <p>Inform your superior management about what's going on.</p> <p> Contact us for pricing and decryption software.</p> <p> Contact us by email:<p> <h2>[email protected]</h2> </p>If you do not receive a response within 24 hours, please contact us at our additional contacts:</p> <p> 1) Download for TOX CHAT https://tox.chat/download.html</p> <p> 2) Open chat<p> <p>Add ID Chat: </p><h2>3C9D49B928FDC3C15F0314217623A71B865909B308576B4B0D10AEA62C98677B4A3F160D5C93</h2> <p>If we did not answer you, leave the chat enabled, the operator will contact you!<p> </p>To verify the possibility of the recovery of your files we can decrypted 1-3 file for free.</p> </p>Attach file to the letter (no more than 5Mb).</p> <h2>If you and us succeed the negotiations we will grant you:</h2> <ul> <li>complete confidentiality, we will keep in secret any information regarding to attack, your company will act as if nothing had happened.</li> <li>comprehensive information about vulnerabilities of your network and security report.</li> <li>software and instructions to decrypt all the data that was encrypted.</li> <li>all sensitive downloaded data will be permanently deleted from our cloud storage and we will provide an erasure log.</li> </ul> <h2>Our options if you act like nothing's happening, refuse to make a deal or fail the negotiations:</h2> <ul> <li>inform the media and independent journalists about what happened to your servers. To prove it we'll publish a chunk of private data that you should have ciphered if you care about potential breaches. Moreover, your company will inevitably take decent reputational loss which is hard to assess precisely.</li> <li>inform your clients, employees, partners by phone, e-mail, sms and social networks that you haven't prevent their data leakage. You will violate laws about private data protection.</li> <li>start DDOS attack on you website and infrastructures.</li> <li>personal data stored will be put on sale on the Darknet to find anyone interested to buy useful information regarding your company. It could be data mining agencies or your market competitors.</li> <li>publish all the discovered vulnerabilities found in your network, so anyone will do anything with it.</li> </ul> <h2>Why pay us?</h2> <p>We care about our reputation. You are welcome to google our cases up and be sure that we don't have a single case of failure to provide what we promissed.</p> <p>Turning this issue to a bug bounty will save your private information, reputation and will allow you to use the security report and avoid this kind of situations in future.</p> <h2>Your personal ID</p> Your ID: 7B462FAEEC374B269671573B707B17CF854227A5467F5EC6114D8AD066AB1DA5C27B37A8C7A5E60D6712E0571090C137073B39A5C6B69DEF74719218AB7955F5<br>CEC86A0C6BC1CEAF15FF8472D7688D85E1730EA1158527741AAEDF774794D6C9985DE6F3F8F9EECCF3FB8C5DA2DEF3096B26DA6B328C5F6142DFC05B0657<br>6CE5AB6360A8A1A9E0D3D5971937CEBAB146A8B4F944E6AB0D41427A2CC761BF615B80392CCCC93B67B036485244BA37962EF964176B2E7A0E9F4840F22A<br>EB31AD4729521E4D7C0FC820233872C5AD4231708A17EE906D86DAE0810AAEE8643291601FBCE4E27A7AB363D27FA9823ACDF8A22D3CBBF1B670AA4485E6<br>B1B97AA20F48CB0D8B7C2C31CBC9F4163F090D8CC61E487DF0D4329ECC9BC9457FD160F23BCA5BBB27A47A1C156F45552D9ED42F9C33432CA6276B53D0C1<br>947F6F0EFAF7445D7A6CAB52B31F598755AFCE3009A4EDDCD8DA11078F495548A7888114FA2FC4AC8FC6615A2637AA5F4633C02EC20D3326B3AFF8331215<br>641FB274318BA2EC4FEB3C2AEF0638A298328D3F5920CDC07DBC0C92B07A0427B4A447426484B5880C485DB35B3366ED1C4690A8747885A5E1B6EC2C2245<br>900BDBAF9DCC5B7DEDE7859CF7CA0592D96C73A13FF2B52C11772FE0E6AFCE9FFAFFE1D4CB5C7F96056F7E5229CA4B4390F9AE337F325FBE2DE3C3A9C3E2<br>C35DF828D73E46A9FEEBBC053D38
Emails
URLs

  • https://tox.chat/download.html</p>

Signatures

  • MedusaLocker

    Ransomware with several variants first seen in September 2019.

    ransomwaremedusalocker
  • MedusaLocker payload 2 IoCs
  • UAC bypass 3 TTPs 2 IoCs
    evasiontrojan
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Renames multiple (300) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

    ransomware
  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

    spywarestealer
  • 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).

  • Interacts with shadow copies 2 TTPs 3 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

    ransomware
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 63 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs
  • System policy modification 1 TTPs 3 IoCs
    evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\05b51b5f41e483020d14126522a13c69b75e5cbb093a78980877bb60cf778873.exe
    "C:\Users\Admin\AppData\Local\Temp\05b51b5f41e483020d14126522a13c69b75e5cbb093a78980877bb60cf778873.exe"
    1⤵
    • UAC bypass
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:2464
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:2612
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2904
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:2296
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2972
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:2592
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2840
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:3052
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {6F720946-E326-492D-B15A-091F996E3486} S-1-5-21-4219371764-2579186923-3390623117-1000:NVACMPYA\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1048
    • C:\Users\Admin\AppData\Roaming\svhost.exe
      C:\Users\Admin\AppData\Roaming\svhost.exe
      2⤵
      • Executes dropped EXE
      PID:1628

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        svhost.exe
        • Path C:\Users\Admin\AppData\Roaming\svhost.exe
        • Size 666KB
        • SHA256 05b51b5f41e483020d14126522a13c69b75e5cbb093a78980877bb60cf778873
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        svhost.exe
        • Path C:\Users\Admin\AppData\Roaming\svhost.exe
        • Size 666KB
        • SHA256 05b51b5f41e483020d14126522a13c69b75e5cbb093a78980877bb60cf778873
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        NTUSER.DAT.LOG2
        • Path C:\Users\Default\NTUSER.DAT.LOG2
        • Size 536B
        • SHA256 6d4dd3a4fce8ed9036954530702b0e0fe3b3f8da3c0527a8994de13e330fd2dc
        • MD5 SHA1 SHA512
        Submit Download

        !-Recovery_Instructions-!.html
        • Path \Device\HarddiskVolume1\Boot\!-Recovery_Instructions-!.html
        • Size 5KB
        • SHA256 d45fb0ba60aba77949234f4968b84b020ad202b024ce8269bc5195902e32d221
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download