Analysis

  • max time kernel
    166s
  • max time network
    183s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220721-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31-07-2022 22:23

General

  • Target

    csrss.exe

  • Size

    55KB

  • MD5

    97de24939a69d700be5efbfa388b32ca

  • SHA1

    10fb3bb9a8060069770272dacb96a3756a536807

  • SHA256

    6455f22ea582d86f85a968a6623cbb53bd81f1ad0dd22c98f62a07e2b4b73e5d

  • SHA512

    c04d65684c655af6c33c113291a503437c36bd25fc8ac1694671459065c32c07696c0644ec9cd0cda5abc488e1495365b1f577b42c11a0059b18e0f81d71e74a

Malware Config

Extracted

Path

C:\how_to_back_files.html

Ransom Note
<html> <style type="text/css"> body { background-color: #404040; } { margin: 0; padding: 0; } h1, h3{ text-align: center; text-transform: uppercase; font-weight: normal; } /*---*/ .tabs1{ width: 800px; display: block; margin: auto; position: relative; } .tabs1 .head{ text-align: center; float: top; text-transform: uppercase; font-weight: normal; display: block; padding: 5px; color: #FF0000; background: #303030; } .tabs1 .identi { margin-left: 0px; line-height: 13px; font-size: 13px; text-align: center; float: top; display: block; padding: 15px; background: #303030; color: #DFDFDF; } /*---*/ .tabs{ width: 800px; display: block; margin: auto; position: relative; } .tabs .tab{ float: left; display: block; } .tabs .tab>input[type="radio"] { position: absolute; top: -9999px; left: -9999px; } .tabs .tab>label { display: block; padding: 6px 21px; font-size: 18x; text-transform: uppercase; cursor: pointer; position: relative; color: #FFF; background: #4A83FD; } .tabs .content { z-index: 0;/* or display: none; */ overflow: hidden; width: 800px; /*padding: 25px;*/ position: absolute; top: 32px; left: 0; background: #303030; color: #DFDFDF; opacity:0; transition: opacity 400ms ease-out; } .tabs .content .text{ width: 700px; padding: 25px; } .tabs>.tab>[id^="tab"]:checked + label { top:0; background: #303030; color: #F5F5F5; } .tabs>.tab>[id^="tab"]:checked ~ [id^="tab-content"] { z-index: 1;/* or display: block; */ opacity: 1; transition: opacity 400ms ease-out; } </style> <head> <meta charset="utf-8"> <title>HOW TO DECRYPT YOUR FILES</title> </head> <body> <div class="tabs1"> <div class="head" ><h3>Your personal ID</h3></div> <div class="identi"> <pre>��2B 2B B4 76 DA 45 AE B4 4C 16 5D 78 B2 B2 A4 F0 25 14 1C 40 87 A2 20 2D C3 BE 9D 1B 16 EB 65 00 7C 37 28 60 35 F6 81 26 25 93 55 F2 61 54 5A C7 B6 7B 01 D5 A5 54 38 6E A8 B1 C3 D5 EE 03 52 BD F9 77 4B 24 F3 66 B0 91 FA FF E0 86 2B CB 8A 22 19 3C D4 BF C5 65 9D 96 82 A6 33 46 92 69 85 A8 56 9F DB B4 7B F7 D4 36 D2 4D CB 4C D9 C0 A4 D3 A3 10 1E 1B 3C E8 44 F8 FB B5 C8 F5 D7 0B F8 0D A5 D8 E0 E6 57 3E D0 8F 22 3C 80 A7 B1 C2 96 C7 07 EC 81 42 76 04 26 15 4D 91 57 39 F6 CE DA 91 1C 69 40 CE F3 1C 61 3D 7B 9A 05 6E C1 F3 03 4B 93 8A 17 8B E8 7A 00 74 03 4E 38 27 00 90 21 B8 26 2C 1F E5 7D 46 E5 3A CF 3F 9A 36 20 B0 B6 C9 CF B3 8B 00 57 11 EB 6D C5 53 F1 E6 BB 3B EC CD E1 10 B0 CE B0 63 3F 8A C5 AB F4 F2 C8 14 BF A3 7B B3 E8 AB 04 7E DE 02 83 4B 11 65 BA EC 44 82 </p> </pre><!-- !!! dont changing this !!! --> </div> </div> <!-- --> <div class="tabs"> <!--tab--> <div class="tab"> <input type="radio" name="tabs" checked="checked" id="tab1" /> <label for="tab1">English</label> <div id="tab-content1" class="content"> <h1>&#9763; Your files are encrypted! &#9763;</h1> <hr/> <h3> &#11015 To decrypt, follow the instructions below. &#11015 </h3> <br/> <div class="text"> <!--text data --> To recover data you need decryptor.</br> To get the decryptor you should:</br> <p>Send 1 crypted test image or text file or document to <span> <font color="FF0000">[email protected] </font></span></br> (Or alternate mail <font color="FF0000"> [email protected] </font>)<p> In the letter include your personal ID (look at the beginning of this document).</p> We will give you the decrypted file and assign the price for decryption all files</p> After we send you instruction how to pay for decrypt and after payment you will receive a decryptor and instructions We can decrypt one file in quality the evidence that we have the decoder.</br> <hr color=red> <center><p style="color:#FF0000">MOST IMPORTANT!!!</p></center> <center><p style="color:#FF0000"> Do not contact other services that promise to decrypt your files, this is fraud on their part! They will buy a decoder from us, and you will pay more for his services. No one, except [email protected], will decrypt your files.</p></center> <hr color=red> <ul> <li>Only [email protected] can decrypt your files</li> <li>Do not trust anyone besides [email protected]</li> <li>Antivirus programs can delete this document and you can not contact us later.</li> <li>Attempts to self-decrypting files will result in the loss of your data</li> <li>Decoders other users are not compatible with your data, because each user's unique encryption key</li> </ul> <!--text data --> </div> </div> </div> <!--tab--> </ul> <!--text data --> </div> </div> <!--tab--> </div> </div> </body> </html> ���������������

Signatures

  • GlobeImposter

    GlobeImposter is a ransomware first seen in 2017.

  • Modifies extensions of user files 12 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.

  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops desktop.ini file(s) 24 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\csrss.exe
    "C:\Users\Admin\AppData\Local\Temp\csrss.exe"
    1⤵
    • Modifies extensions of user files
    • Adds Run key to start application
    • Drops desktop.ini file(s)
    PID:4608

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/4608-130-0x0000000000400000-0x000000000040EC00-memory.dmp

    Filesize

    59KB

  • memory/4608-131-0x0000000000400000-0x000000000040EC00-memory.dmp

    Filesize

    59KB