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
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 behavioral1/files/0x00220000000230f7-1.dat family_cosmu behavioral1/files/0x000300000001f0e6-5.dat family_cosmu -
Renames multiple (5203) 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\rsod\powerpivot.x-none.msi.16.x-none.boot.tree.dat.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\System.Windows.Presentation.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jre-1.8\lib\ext\localedata.jar.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_OEM_Perp4-ul-oob.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\ja\System.Xaml.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jdk-1.8\include\jvmti.h.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessPipcDemoR_BypassTrial365-ppd.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365HomePremR_SubTrial4-ul-oob.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\RepoMan.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.IO.MemoryMappedFiles.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.ObjectModel.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\es\System.Xaml.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\zh-Hans\PresentationCore.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jre-1.8\bin\decora_sse.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\ONENOTE_F_COL.HXK.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Common Files\microsoft shared\ink\hwritalm.dat.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\PowerPointR_Trial-pl.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\LogoImages\WinWordLogo.scale-100.png.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\MEDIA\WHOOSH.WAV.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000027\assets\Icons\[email protected] b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\7-Zip\Lang\ky.txt.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\zh-Hant\PresentationUI.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioProCO365R_Subscription-ul-oob.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\LogoImages\PowerPntLogoSmall.contrast-white_scale-140.png.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\PAGESIZE\PGLBL119.XML.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Common Files\microsoft shared\ink\fr-FR\tabskb.dll.mui.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Common Files\microsoft shared\ink\ipshi.xml.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\PowerPointR_Retail-ul-phn.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000049\catalog.json.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\zh-Hant\System.Xaml.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\PackageManifests\AppXManifest.common.16.xml.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\PublisherR_Grace-ul-oob.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\msotdintl.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\ONENOTE_WHATSNEW.XML.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Diagnostics.Process.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\DirectWriteForwarder.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\PackageManifests\AppXManifest.90160000-0115-0409-1000-0000000FF1CE.xml.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\Word2019VL_MAK_AE-ppd.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\PROOF\MSHY7EN.DLL.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\fr\UIAutomationTypes.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jre-1.8\bin\jjs.exe.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProjectStd2019R_Grace-ul-oob.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\LogoImages\PowerPntLogoSmall.contrast-white_scale-180.png.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Common Files\System\msadc\ja-JP\msadcer.dll.mui.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\ja\System.Windows.Input.Manipulations.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\PenImc_cor3.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ExcelR_Retail-ul-oob.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365HomePremR_Subscription5-ul-oob.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Google\Chrome\Application\133.0.6943.60\Locales\en-GB.pak.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\pkeyconfig-office-client15.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365SmallBusPremR_SubTrial4-pl.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProjectStdCO365R_SubTrial-pl.xrm-ms.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\ADDINS\PowerPivot Excel Add-in\Resources\1033\PowerPivotExcelClientAddIn.rll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\vfs\Common AppData\Microsoft Help\MS.DATABASECOMPARE.16.1033.hxn.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jdk-1.8\jre\legal\javafx\glib.md.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Java\jre-1.8\bin\api-ms-win-crt-convert-l1-1-0.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\mscorlib.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\MSSRINTL.DLL.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Microsoft Office\root\Office16\ADDINS\Microsoft Power Query for Excel Integrated\bin\Microsoft.Data.SapClient.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\Common Files\System\Ole DB\fr-FR\sqlxmlx.rll.mui.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Diagnostics.Contracts.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Diagnostics.Tracing.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\de\UIAutomationProvider.resources.dll.tmp b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\System.CodeDom.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:1336
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
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Filesize
26KB
MD5b19f2ea7d3406b4de337a753e11f230c
SHA123cc90cd4896f92278327b2c09bf2e612acc849b
SHA256d94a3c24cbb3b5d9f0656efbcff5db83d41b51e41b6603184a9ed83754dfd3e1
SHA51256615fd628730aba27b384dc5630fda9f987bdc9df4fc2289dab0f0e8c2f8223149fe456b709b5ccd3a4ca538dcb2fa982bdca3c9e907e9676e5109bd0c191af
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Filesize
107KB
MD5162f8a135f62f7609e53bfea42dc3369
SHA1f838222a387a02cf762269e18c06aa7f448a98a9
SHA256ed95f0543c6dc6d7ead8a8f5dda4ca8f297fc33a282159da2b455aa6d727d267
SHA512a0193e2f65910c1584c16c40024c238e492c16606e1c723d9145f448b6edc0509acc154500b29c9fc849a416458aefe6fc2d6f813452c191994a3b3c8e1429fe