698de5b6086e09811c48e4967f28e4ca38cdc79fd85e0bd399ffd150e81f572d

General

Target

BuildS.exe
Size

53KB
MD5

d0feecd8202129bb9c19823a04cd93ce
SHA1

631b2e3c26dfa53778d881e592cc9e499e7f98bb
SHA256

0dc4a2e2f49b2a6265a3c011d186a6f79ca8356d49d1c687465a5d994b6db38a
SHA512

03676f15ee822f550e2dc5e979d205ce0f154d2e1062a7d8257931ca945c6f536de913f28f4abc0a399a0b1bacd380cbff3f26d0ec597c0d7593f349b121e097

Score

10^/10

persistence ransomware spyware stealer

Malware Config

Extracted

Path

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;">��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span> <br>  </div> </div>  <div class="tabs">  <div class="tab"> <div id="tab-content1" class="content"> <div class="text">  <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>  <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 </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="ithelp05@decorous.cyou ">ithelp05@decorous.cyou </a> <br><a href="ithelp05@wholeness.business">ithelp05@wholeness.business</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>   </div> </div>  </div> </div> </body> </html> ��

Emails

href="ithelp05@decorous.cyou

">ithelp05@decorous.cyou

href="ithelp05@wholeness.business">ithelp05@wholeness.business</a>

Signatures

Modifies extensions of user files 6 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

BuildS.exe

description	ioc	process
File renamed	C:\Users\Admin\Pictures\FormatDeny.tif => C:\Users\Admin\Pictures\FormatDeny.tif.LOCK	BuildS.exe
File opened for modification	C:\Users\Admin\Pictures\LimitRemove.tiff	BuildS.exe
File renamed	C:\Users\Admin\Pictures\LimitRemove.tiff => C:\Users\Admin\Pictures\LimitRemove.tiff.LOCK	BuildS.exe
File opened for modification	C:\Users\Admin\Pictures\PingUnpublish.tiff	BuildS.exe
File renamed	C:\Users\Admin\Pictures\PingUnpublish.tiff => C:\Users\Admin\Pictures\PingUnpublish.tiff.LOCK	BuildS.exe
File renamed	C:\Users\Admin\Pictures\UseRequest.crw => C:\Users\Admin\Pictures\UseRequest.crw.LOCK	BuildS.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

BuildS.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3456797065-1076791440-4146276586-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	BuildS.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3456797065-1076791440-4146276586-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\BrowserUpdateCheck = "C:\\Users\\Admin\\AppData\\Local\\BuildS.exe"	BuildS.exe

Drops desktop.ini file(s) 27 IoCs

Processes:

BuildS.exe

description	ioc	process
File opened for modification	C:\Users\Admin\Links\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Admin\Desktop\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Admin\Contacts\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\Desktop\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Admin\Saved Games\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\Libraries\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\Videos\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\Music\Sample Music\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Admin\Videos\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Admin\Favorites\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\Downloads\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\Documents\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Admin\Music\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Admin\Downloads\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\Pictures\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Admin\Favorites\Links\desktop.ini	BuildS.exe
File opened for modification	C:\Program Files (x86)\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Admin\Pictures\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Admin\Favorites\Links for United States\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\Recorded TV\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\Recorded TV\Sample Media\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Admin\Documents\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\Pictures\Sample Pictures\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\Music\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Admin\Searches\desktop.ini	BuildS.exe
File opened for modification	C:\Users\Public\Videos\Sample Videos\desktop.ini	BuildS.exe

Drops file in Program Files directory 64 IoCs

Processes:

BuildS.exe

description	ioc	process
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\BIZFORM.XML	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PAGESIZE\PGMN002.XML	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\bg_Casual.gif	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\FORMS\1033\NOTES.ICO	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\GRAPH_K_COL.HXK	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Templates\1033\ContemporaryPhotoAlbum.potx	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\MAPIPH.DLL	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\FormsStyles\SoftBlue\TAB_ON.GIF	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\CommonData\AlertImage_FileHighMask.bmp	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Library\Analysis\ATPVBAEN.XLAM	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms\FieldTypePreview\CONTACT.JPG	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\ZPDIR14F.GIF	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Templates\1033\ExecutiveResume.dotx	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\OLKIRM.XML	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\OUTLOOK.EXE.MANIFEST	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PAGESIZE\PGLBL109.XML	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\QP.DPV	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\FormsStyles\Biscay\TAB_OFF.GIF	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\FORMS\1033\SHARING.CFG	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Templates\1033\ExpenseReport.xltx	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\BCSRuntime.dll	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\mset7es.kic	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\OISAPP.DLL	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\bg_Country.gif	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms3\FormsStyles\Americana\TAB_ON.GIF	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\PDIR50B.GIF	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Visual Studio 8\VSTA\Bin\VSTAProject.dll	BuildS.exe
File created	C:\Program Files (x86)\Microsoft Visual Studio 8\VSTA\Bin\1033\how_to_back_files.html	BuildS.exe
File created	C:\Program Files (x86)\Microsoft Sync Framework\v1.0\Runtime\x86\resources\1033\how_to_back_files.html	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Templates\1033\BlackTieMergeLetter.dotx	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms3\LAUNCH.GIF	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms\FieldTypePreview\DATETIME.JPG	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\CommonData\AlertImage_FileOff.jpg	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\PDIR8B.GIF	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\BIZCARD.DPV	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\PS9CRNRH.POC	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PAGESIZE\PGLBL065.XML	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\button_left.gif	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\PDIR7B.GIF	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Templates\1033\FAX\EquityFax.Dotx	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\MSOCFUIUTILITIESDLL.DLL	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\DGREPFRM.DPV	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\MSPUB.DEV_COL.HXT	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolIcons\WSS.ICO	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms5\FORM.JS	BuildS.exe
File created	C:\Program Files (x86)\Microsoft Office\Templates\1033\Access\how_to_back_files.html	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\CATALOG.XML	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\ORIG98.POC	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\WORDREP.DPV	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Visual Studio 8\Common7\IDE\VSTA\ItemTemplates\CSharp\1033\ResourceInternal.zip	BuildS.exe
File created	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms3\FormsStyles\Lime\how_to_back_files.html	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\ZPDIR7F.GIF	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBFTSCM\SCHEME22.CSS	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Library\Analysis\PROCDB.XLAM	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\GrooveForms5\FormsStyles\Slate.css	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\FormsStyles\BrightOrange\BUTTON.GIF	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms\BG_ADOBE.GIF	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\PROTTPLN.DOC	BuildS.exe
File opened for modification	C:\Program Files (x86)\Mozilla Maintenance Service\logs\maintenanceservice-install.log	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\DGWEBREF.XML	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms3\button_left.gif	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms3\FormsStyles\VelvetRose.css	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\MSPST32.DLL	BuildS.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms\utilityfunctions.js	BuildS.exe

C:\Users\Admin\AppData\Local\Temp\BuildS.exe
"C:\Users\Admin\AppData\Local\Temp\BuildS.exe"
1⤵
- Modifies extensions of user files
- Adds Run key to start application
- Drops desktop.ini file(s)
- Drops file in Program Files directory
PID:1628