Analysis
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max time kernel
150s -
max time network
137s -
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, 08:15
Static task
static1
Behavioral task
behavioral1
Sample
87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe
Resource
win10v2004-20250502-en
Behavioral task
behavioral2
Sample
87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe
Resource
win11-20250502-en
General
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Target
87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe
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Size
22KB
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MD5
8b2f4ef74e4a20c23bc281110705ab70
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SHA1
b723dcc235faa790924821c84cd9d375fbae180c
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SHA256
87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182
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SHA512
88e19e4080ac010f41c5a83b26c5b6183025ad120681fe3fa50a80f4c2d54ec34ab394e2965318394226471c3d6f146cbabe63048132d2296b8fc3fe3a389ff9
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SSDEEP
384:hAg+5OCZ4W6/KWLsqmFae+rOAqmFae+rOiOZ2OZW0i90ixyX:uZ4FLz8ae+rOn8ae+rOWdxyX
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 behavioral1/memory/876-797-0x0000000000400000-0x0000000000407000-memory.dmp family_cosmu -
Renames multiple (5202) 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\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\cs\PresentationFramework.resources.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\zh-Hant\WindowsBase.resources.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Windows.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\ko\WindowsFormsIntegration.resources.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\LogoImages\WinWordLogo.contrast-black_scale-180.png.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\PAGESIZE\PGLBL027.XML.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Common Files\microsoft shared\ink\en-US\InkObj.dll.mui.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\api-ms-win-core-console-l1-2-0.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Net.Requests.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\javaw.exe.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\DIFF_MATCH_PATCH_WIN32.DLL.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\VVIEWER.DLL.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\fr\PresentationUI.resources.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Data.DataSetExtensions.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Colors\Paper.xml.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Java\jre-1.8\release.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\msvcp120.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Common Files\System\it-IT\wab32res.dll.mui.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Common Files\System\Ole DB\msdasql.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.IO.FileSystem.DriveInfo.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\de\Microsoft.VisualBasic.Forms.resources.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\fr\Microsoft.VisualBasic.Forms.resources.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Java\jdk-1.8\bin\idlj.exe.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Private.Uri.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProPlus2019R_Trial-ul-oob.xrm-ms.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\LogoImages\PowerPntLogo.contrast-white_scale-100.png.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\ODBC Drivers\Salesforce\lib\cacerts.pem.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Private.CoreLib.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Runtime.Numerics.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\GRAPH.HXS.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\msoadfsb.exe.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\WEBSANDBOX.DLL.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.it-it.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Net.Http.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\System.Windows.Forms.Design.Editors.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Java\jdk-1.8\jre\THIRDPARTYLICENSEREADME.txt.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Java\jre-1.8\legal\jdk\bcel.md.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Effects\Extreme Shadow.eftx.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_Retail2-ul-oob.xrm-ms.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Licenses16\HomeStudentDemoR_BypassTrial180-ppd.xrm-ms.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365BusinessDemoR_BypassTrial365-ppd.xrm-ms.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProPlus2019VL_MAK_AE-ul-phn.xrm-ms.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Licenses16\Standard2019R_Retail-ppd.xrm-ms.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Threading.Tasks.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\fr\System.Windows.Forms.Design.resources.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\fr\UIAutomationClient.resources.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\ko\PresentationCore.resources.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Google\Chrome\Application\133.0.6943.60\Locales\ms.pak.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\WINWORD_K_COL.HXK.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000027\assets\Icons\HintBarEllipses.16.GrayF.png.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000027\assets\Icons\[email protected] 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Java\jre-1.8\bin\api-ms-win-crt-multibyte-l1-1-0.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\System.Windows.Forms.Design.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\Microsoft.VisualBasic.Core.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Security.Cryptography.Csp.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\de\PresentationUI.resources.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\ko\System.Windows.Forms.resources.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\eula.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.IO.UnmanagedMemoryStream.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Private.Uri.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\es\Microsoft.VisualBasic.Forms.resources.dll.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Java\jre-1.8\lib\ext\cldrdata.jar.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365ProPlusR_SubTrial3-pl.xrm-ms.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe File created C:\Program Files\Microsoft Office\root\Office16\MSIPC\lt\msipc.dll.mui.tmp 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.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 87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe"C:\Users\Admin\AppData\Local\Temp\87eb57e0a3fef69f3736666ffe2decf43804b6f69e460492a3abdca665677182.exe"1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:876
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
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Filesize
22KB
MD556135ee3d744744214eb0fd55955c1bc
SHA1251fc7a1d97604939b8cee4ffb916547a1bfaa7b
SHA256a7934236cbf9179fe2d583b9e79fbcd1d96af5d2e9ab3185924e4623d72ef60a
SHA512f577f1d33f85b89b474f8ae6cb874c09b3cbe259c4cdaff7ea246adfbfe149b38428b5b124302ad376e55cbd803703ace7da43227f14651fd284dfb02874e00d
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Filesize
103KB
MD52db6992748cc1b812a5cafa6d36ec611
SHA1d7a4fbf5e4ca97fed1c7cf904cfc87e440a3e506
SHA2565a02354cbc7d6faea39461f7c560e0209895238b287e14751c0294f870f550ce
SHA512589b6a7121f1a99144c677c9013f06e4e08fa98344101b2b3c0584928b974ffc5216ba2deb13adeb55b7817b28868ea6bba4cf22b8bed28f1b5f1dd3dbcbfe91