Analysis
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max time kernel
150s -
max time network
134s -
platform
windows10-2004_x64 -
resource
win10v2004-20250502-en -
resource tags
arch:x64arch:x86image:win10v2004-20250502-enlocale:en-usos:windows10-2004-x64system -
submitted
29/05/2025, 11:58
Behavioral task
behavioral1
Sample
31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe
Resource
win10v2004-20250502-en
Behavioral task
behavioral2
Sample
31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe
Resource
win11-20250502-en
General
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Target
31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe
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Size
79KB
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MD5
6a43f3c8567cca14b422a3fe1b3b5a07
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SHA1
a16d10ded5e5cb3781c6f066db83370603b986b7
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SHA256
31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a
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SHA512
40523062a4ccee23e61724967aa1139723ed3dc75ec97c9da9431fb77c82665d52aaad97f0dc4b5d87bbc0d7e219d2ddc90628e738ed1f7b6dd534da7774fc12
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SSDEEP
768:s7BlpppARFbhdLz8ae+rOn8ae+rOoJhiJhYueGJhzAEaSXmlOT:s7ZppApdIIoJhiJhYueBFJlOT
Malware Config
Signatures
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Cosmu family
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Detects Cosmu payload 2 IoCs
Cosmu is a worm written in C++.
resource yara_rule behavioral1/files/0x000700000002365c-1.dat family_cosmu behavioral1/files/0x000400000001ee9b-5.dat family_cosmu -
Renames multiple (5091) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Drops file in Program Files directory 64 IoCs
description ioc Process File created C:\Program Files\7-Zip\Lang\si.txt.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Common Files\System\Ole DB\fr-FR\sqloledb.rll.mui.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\it\Microsoft.VisualBasic.Forms.resources.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\PresentationFramework.Aero.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Fonts\TrebuchetMs.xml.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Licenses16\OneNoteR_Retail-ul-phn.xrm-ms.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Licenses16\PublisherR_OEM_Perp-pl.xrm-ms.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\BORDERS\MSART15.BDR.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\LICENSE.txt.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\vcruntime140_cor3.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Java\jdk-1.8\bin\api-ms-win-crt-math-l1-1-0.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\LogoImages\FirstRunLogo.contrast-black_scale-80.png.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\LogoImages\WinWordLogo.contrast-white_scale-180.png.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\MEDIA\COIN.WAV.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\Microsoft.Office.PolicyTips.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\ONENOTEIMP.DLL.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\main\ja-jp.xml.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Google\Chrome\Application\133.0.6943.60\Locales\da.pak.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\bci.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Licenses16\PersonalR_Trial-ppd.xrm-ms.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\7-Zip\Lang\fr.txt.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\kinit.exe.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\rsod\office32ww.msi.16.x-none.tree.dat.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Common Files\System\msadc\fr-FR\msdaremr.dll.mui.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Linq.Queryable.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\ja\Microsoft.VisualBasic.Forms.resources.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Java\jdk-1.8\bin\api-ms-win-crt-process-l1-1-0.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\cs\PresentationFramework.resources.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\D3DCompiler_47_cor3.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\fr\Microsoft.VisualBasic.Forms.resources.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\pl\UIAutomationClientSideProviders.resources.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\sunec.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Java\jre-1.8\lib\deploy\messages_zh_CN.properties.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365ProPlusE5R_SubTrial-pl.xrm-ms.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Licenses16\StandardVL_MAK-pl.xrm-ms.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Common Files\microsoft shared\ink\en-US\TipRes.dll.mui.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Colors\Median.xml.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Integration\Integrator.exe.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000018\cardview\lib\native-common\assets\[email protected] 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_OEM_Perp2-pl.xrm-ms.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\TellMePowerPoint.nrr.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\pl\WindowsBase.resources.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Google\Chrome\Application\133.0.6943.60\Locales\tr.pak.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Java\jre-1.8\legal\jdk\pkcs11wrapper.md.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProjectStdVL_MAK-ppd.xrm-ms.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-time-l1-1-0.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Diagnostics.StackTrace.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\prism_sw.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\PAGESIZE\PGLBL022.XML.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\it\System.Windows.Forms.Primitives.resources.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\it\PresentationUI.resources.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\zh-Hant\Microsoft.VisualBasic.Forms.resources.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Google\Chrome\Application\133.0.6943.60\Locales\el.pak.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365HomePremR_Subscription3-ul-oob.xrm-ms.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\WINWORD_COL.HXT.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Net.Http.Json.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Data.DataSetExtensions.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\fr\System.Windows.Forms.Design.resources.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioProMSDNR_Retail-ul-oob.xrm-ms.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\LogoImages\ExcelLogoSmall.scale-140.png.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\TellMeRuntime.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Common Files\microsoft shared\ink\ipsrom.xml.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\de\UIAutomationClient.resources.dll.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\QuickStyles\basicsimple.dotx.tmp 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe -
System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe"C:\Users\Admin\AppData\Local\Temp\31219bb50eca7514d0043992615702d4beef2ded95f668edaca1e8a92905208a.exe"1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:5828
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
79KB
MD5cd707033bc7da261f0bf288382dda4df
SHA1c37bade11c20fa6bca07717e357cdcce3ea6d7ef
SHA25679b5b4bc92c252977d6c60d143a8e2887b026d0a5054b795c64c2d1c4d53880a
SHA512aff1af72bc6db1cb51cf0287532ffddaffa30fb8ddef836a91c02167a2a37d5657c5ba78d8b9ee131d16370d31d1923a5c9fc6d6611fcd4a836ff448145959c3
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Filesize
165KB
MD51a552ed95b39505da9389c3ec30c7579
SHA123e3e038f6b1e1f74e735ea18b7d56e0c10dadce
SHA2566e8632a1d92aa6b16460949689889c32b2f7a4f27de0a30da8aea6b2748087ac
SHA512881064655645d1fced42911825626692fc6240e0aaf21b224f09cbb9b0fea4cbf9d846e4d512acd0b9d804a964e494f2c104788106a93548e5bd8283807b1343