Analysis
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max time kernel
150s -
max time network
103s -
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
Behavioral task
behavioral1
Sample
b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe
Resource
win10v2004-20250502-en
Behavioral task
behavioral2
Sample
b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe
Resource
win11-20250502-en
General
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Target
b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe
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Size
26KB
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MD5
fa24406f7dced91a8d217b89fcf5edcf
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SHA1
3acbdd164372f9844b92346603c64f970c8079fa
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SHA256
b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa
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SHA512
5b9fd0b3dd6678f5e8661ebf0fbde70effd7f6bd62ee4c03d8bf7c0241786ae4908deebc5f5d8ddb0513c4bc539ecdec6fdf92f3988c273d6eab31bb44d603b9
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SSDEEP
384:gBt7Br5xjL9AgA71FbhvP/KWLsqmFae+rOAqmFae+rOb8p8dWA8dWK:s7BlpppARFbhdLz8ae+rOn8ae+rOb8N
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 behavioral2/files/0x000b00000002acc6-1.dat family_cosmu behavioral2/files/0x00040000000270eb-5.dat family_cosmu -
Renames multiple (5366) 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\Common Files\microsoft shared\ink\fsdefinitions\keypad\ea.xml.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Net.WebSockets.Client.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jre-1.8\lib\deploy\messages_de.properties.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Templates\1033\AdjacencyLetter.dotx.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProjectStdO365R_SubTrial-ppd.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\PAGESIZE\PGLBL112.XML.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000027\assets\Icons\CancelGlyph.16.GrayF.png.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\System.Windows.Extensions.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\PAGESIZE\PGLBL086.XML.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\OFFICE16\Cultures\OFFICE.ODF.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Web.HttpUtility.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\.version.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\msquic.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jre-1.8\lib\flavormap.properties.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Integration\C2RManifest.officemuiset.msi.16.en-us.xml.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Google\Chrome\Application\133.0.6943.60\Locales\en-US.pak.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\ODBC Drivers\Salesforce\lib\sbicuin58_64.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\OFFICE16\api-ms-win-core-file-l2-1-0.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Common Files\microsoft shared\ink\fr-FR\TabTip.exe.mui.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\java.exe.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jre-1.8\legal\javafx\libxslt.md.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\OFFICE16\DataModel\tmapi_xl.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\pt-BR\PresentationCore.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jre-1.8\bin\w2k_lsa_auth.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\ClientSub2019_eula.txt.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Templates\1033\TimeCard.xltx.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Dynamic.Runtime.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\UIAutomationClientSideProviders.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\PresentationFramework.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_Retail-ppd.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\StandardVL_KMS_Client-ul.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\ADDINS\Power View Excel Add-in\Microsoft.PowerBI.Diagnostics.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\rsod\onenotemui.msi.16.en-us.tree.dat.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Transactions.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Net.Requests.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Web.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\tr\System.Windows.Forms.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\System.Drawing.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jdk-1.8\jre\legal\jdk\santuario.md.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jre-1.8\Welcome.html.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365HomePremR_SubTrial1-ul-oob.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Runtime.Serialization.Formatters.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\it\WindowsFormsIntegration.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProjectPro2019VL_KMS_Client_AE-ul-oob.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioProO365R_SubTest-pl.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\ADDINS\PowerPivot Excel Add-in\Cartridges\hive.xsl.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\vfs\Fonts\private\SEGOEUISL.TTF.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\OFFICE16\DataModel\Microsoft.Excel.AdomdClient.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Net.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.IO.Pipes.AccessControl.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Linq.Parallel.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Threading.ThreadPool.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jre-1.8\lib\content-types.properties.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProjectPro2019XC2RVL_KMS_ClientC2R-ul-oob.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioPro2019XC2RVL_MAKC2R-ul-phn.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\Word2019R_OEM_Perp-pl.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Private.Xml.Linq.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\it\System.Windows.Forms.Primitives.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\es\WindowsBase.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\cs\WindowsFormsIntegration.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\api-ms-win-core-processenvironment-l1-1-0.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\ADDINS\Microsoft Power Query for Excel Integrated\bin\Microsoft.MashupEngine.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\Bibliography\Style\CHICAGO.XSL.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\OsfTaskengine.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.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 b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe"C:\Users\Admin\AppData\Local\Temp\b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe"1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:5896
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
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Filesize
26KB
MD5a2eca795d6fcd3f792040732b373c07c
SHA146401b9e269337da3dffc53b5b8a699d49ae463f
SHA256e2d70dd5cfbf0ed143420d3f934a331d74268aa17f6ec809f8589d5ad7236387
SHA51224bb5bb08adb8c8aeb2a91a0a3c32131c550f9badb884a1ad21bcad854126d72402ccac488d5530d48ceab0da91ac8910d6d76a2b0ad13e05a5eaf5555c739b3
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Filesize
108KB
MD5450d448575c1c01aba12cffb8e13f7fb
SHA18096ca61e4d377517b917a9816aa3743db3f6e0f
SHA256d734cf4cd0dc7033119a15aa781b608b891fe7412c2c1ad4117c3c450f0046cc
SHA5128ed06d91c8f2fcae2a5f39ec97901f9da4e1df92c3015a230a483544514119ad3baaddfdb8500b8eb374018b01afb157d92b50fadd3e5713ccaaf96a32c935d1