Analysis
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max time kernel
149s -
max time network
102s -
platform
windows11-21h2_x64 -
resource
win11-20250502-en -
resource tags
arch:x64arch:x86image:win11-20250502-enlocale:en-usos:windows11-21h2-x64system -
submitted
05/06/2025, 08:14
Static task
static1
Behavioral task
behavioral1
Sample
a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe
Resource
win10v2004-20250502-en
Behavioral task
behavioral2
Sample
a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe
Resource
win11-20250502-en
General
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Target
a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe
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Size
19KB
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MD5
e348051170938c799b6303a8141c9299
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SHA1
eb602bf4bf72e15aed85b31af03e2f0840c69e82
-
SHA256
a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7
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SHA512
4537f920f6adc2b680b6d298ae6bca4db9d9bb8615e0b65ed63c6c1a4453d560d28bc6294b63d4b2862431d167a5ca6f0b6c27ae42d0f430c275e84b785c0fdd
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SSDEEP
384:hAg+5OCZ4W6/KWLsqmFae+rOAqmFae+rOiOZ2OZofTlCGrlCGT:uZ4FLz8ae+rOn8ae+rOkkGUGT
Malware Config
Signatures
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Cosmu family
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Detects Cosmu payload 1 IoCs
Cosmu is a worm written in C++.
resource yara_rule behavioral2/memory/2364-1225-0x0000000000400000-0x0000000000407000-memory.dmp family_cosmu -
Renames multiple (5361) 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\Microsoft Office\root\Office16\MSIPC\pt\msipc.dll.mui.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Templates\1033\Word 2010 look.dotx.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\cs\System.Windows.Forms.Design.resources.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Java\jdk-1.8\jre\legal\jdk\jcup.md.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Java\jre-1.8\bin\api-ms-win-core-debug-l1-1-0.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Java\jre-1.8\lib\ext\access-bridge-64.jar.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\LogoImages\PowerPntLogo.scale-100.png.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\rsod\officemui.msi.16.en-us.tree.dat.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\api-ms-win-core-processthreads-l1-1-1.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Threading.Tasks.Parallel.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\de\PresentationUI.resources.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\pt-BR\System.Windows.Input.Manipulations.resources.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\es\System.Xaml.resources.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProPlusDemoR_BypassTrial180-ul-oob.xrm-ms.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Licenses16\PublisherR_OEM_Perp-ul-phn.xrm-ms.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Licenses16\WordR_Retail-pl.xrm-ms.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\System.Security.Permissions.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Java\jre-1.8\bin\dcpr.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Effects\Subtle Solids.eftx.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\ONENOTE_WHATSNEW.XML.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\ADDINS\PowerPivot Excel Add-in\PowerPivotExcelClientAddIn.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\api-ms-win-core-processthreads-l1-1-1.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\MSIPC\ar\msipc.dll.mui.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\7-Zip\Lang\az.txt.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Net.ServicePoint.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\api-ms-win-crt-utility-l1-1-0.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioStdO365R_Subscription-ppd.xrm-ms.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\Configuration\card_security_terms_dict.txt.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Java\jre-1.8\bin\JavaAccessBridge-64.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Java\jre-1.8\lib\security\public_suffix_list.dat.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Licenses16\AccessVL_KMS_Client-ppd.xrm-ms.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProjectProVL_MAK-pl.xrm-ms.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Common Files\System\Ole DB\oledbvbs.inc.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\cs\WindowsFormsIntegration.resources.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\api-ms-win-crt-math-l1-1-0.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\MSOSTYLE.DLL.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\WORDICON.EXE.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\rsod\powerpivot.x-none.msi.16.x-none.tree.dat.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\EQUATION\api-ms-win-crt-multibyte-l1-1-0.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.ComponentModel.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\ko\UIAutomationProvider.resources.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\fr\PresentationCore.resources.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\t2k.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\GR8GALRY.GRA.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\mscss7cm_en.dub.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_OEM_Perp3-ppd.xrm-ms.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Licenses16\SkypeforBusiness2019R_Trial-pl.xrm-ms.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\AppvIsvSubsystems64.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000027\assets\Icons\Unlock.White.png.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Templates\1033\ContemporaryPhotoAlbum.potx.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\fr\UIAutomationClientSideProviders.resources.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\UIAutomationClient.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Java\jdk-1.8\legal\jdk\colorimaging.md.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Fonts\Garamond.xml.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Office16\PAGESIZE\PGLBL096.XML.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Google\Chrome\Application\133.0.6943.60\WidevineCdm\_platform_specific\win_x64\widevinecdm.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365SmallBusPremR_SubTrial5-ppd.xrm-ms.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\vfs\Common AppData\Microsoft Help\MS.GRAPH.16.1033.hxn.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Java\jdk-1.8\jre\lib\deploy\messages_it.properties.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Colors\Red Violet.xml.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProPlus2019R_Trial-ul-oob.xrm-ms.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\Microsoft.Win32.Registry.AccessControl.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\cs\ReachFramework.resources.dll.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe File created C:\Program Files\Microsoft Office\root\Licenses16\SkypeforBusiness2019R_Retail-pl.xrm-ms.tmp a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.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 a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe"C:\Users\Admin\AppData\Local\Temp\a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe"1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:2364
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
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Filesize
19KB
MD5b8317a827b672629d02da340aec2bcf0
SHA1631830e682815df8c311ab70ef8783fe81e99f7b
SHA256ac3662a35fe2ce0e38ce8b1c0133426c82d09ea464fcd16de4acc8f0ecc2d0fb
SHA512c3eaef26a0601bb2777e697b929fa6f9ad43f464911137f482146b08acde868cc0101cb9a4981e4d36ecccc3f3b2b072a0fba71708785a8cc6742cde72929324
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Filesize
100KB
MD52896ca3de0909e34d804c60094d23922
SHA1af26d84d2ac3f3cc7b2dece7d13628893edc5ce7
SHA256de1949ff342b86fca1b1cde35436b938f177e16790b16cae2fcae8c1cd349f7f
SHA5129052e33c95dfb24879af7e60ab5be31e017f82ccc70cbab861a9cc64334692066affafefb5e92007cb6fe0c8322f01fbb03a1bb74015375aaa9c220ece47f087