Analysis
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max time kernel
149s -
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
29/05/2025, 10:02
Behavioral task
behavioral1
Sample
256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe
Resource
win10v2004-20250502-en
General
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Target
256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe
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Size
19KB
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MD5
32659ccf24b8bacc1e9e9d369a81b3e7
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SHA1
c091ca4860be26d14f7b950dec7ec504747a633f
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SHA256
256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75
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SHA512
06bbd263b9cc6a4b75085f7c5378aa40f81cee99a130b54cf4a44f0831ae7bc97eca0c6c7ddd34ea10740cb88ae62cef1269f2f53cf99571b7a24de2eccfc425
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SSDEEP
384:gBt7Br5xjL9AgA71FbhvP/KWLsqmFae+rOAqmFae+rOW:s7BlpppARFbhdLz8ae+rOn8ae+rOW
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/0x0008000000024147-1.dat family_cosmu behavioral1/files/0x000300000001f0de-5.dat family_cosmu -
Renames multiple (5329) 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\ClickToRun\concrt140.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Threading.Thread.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\it\System.Windows.Forms.Design.resources.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\Office16\OSPPREARM.EXE.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\es\System.Xaml.resources.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\tr\UIAutomationClient.resources.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\fr\System.Windows.Controls.Ribbon.resources.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Java\jre-1.8\bin\glass.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365ProPlusR_SubTrial3-pl.xrm-ms.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioProR_OEM_Perp-pl.xrm-ms.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\main\ja-jp.xml.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.IO.FileSystem.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\PresentationUI.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\jfr.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Java\jdk-1.8\jre\lib\images\cursors\win32_LinkDrop32x32.gif.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Java\jre-1.8\bin\msvcp140_2.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365EduCloudEDUR_SubTrial-ppd.xrm-ms.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Office16\LogoImages\ExcelLogoSmall.contrast-white_scale-140.png.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\ja\UIAutomationProvider.resources.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\ko\System.Windows.Controls.Ribbon.resources.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\kinit.exe.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365BusinessR_Grace-ul-oob.xrm-ms.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Licenses16\PersonalPipcR_OEM_Perp-ul-oob.xrm-ms.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\vfs\Fonts\private\NIRMALA.TTF.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Net.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Threading.ThreadPool.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_Grace-ppd.xrm-ms.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Office16\MSIPC\uk\msipc.dll.mui.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Common Files\System\ado\msadomd28.tlb.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Net.WebHeaderCollection.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Colors\Red Violet.xml.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Licenses16\MondoR_SubTrial2-pl.xrm-ms.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365BusinessR_SubTrial-ppd.xrm-ms.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Office16\api-ms-win-crt-multibyte-l1-1-0.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\OFFICE16\api-ms-win-core-processthreads-l1-1-1.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\7-Zip\Lang\hr.txt.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.he-il.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Common Files\System\ja-JP\wab32res.dll.mui.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\it\UIAutomationTypes.resources.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\Microsoft.WindowsDesktop.App.deps.json.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Java\jdk-1.8\jre\legal\javafx\mesa3d.md.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Licenses16\Excel2019R_Retail-ppd.xrm-ms.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Office16\ORGCHART.EXE.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Common Files\microsoft shared\ink\mshwjpn.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\api-ms-win-crt-private-l1-1-0.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\tr\PresentationCore.resources.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Java\jdk-1.8\legal\jdk\cryptix.md.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Java\jdk-1.8\lib\tools.jar.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Office16\BORDERS\MSART10.BDR.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Templates\1033\WidescreenPresentation.potx.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\vfs\Fonts\private\BOOKOSI.TTF.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\api-ms-win-core-fibers-l1-1-0.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\zh-Hans\WindowsFormsIntegration.resources.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioPro2019VL_MAK_AE-ppd.xrm-ms.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Net.ServicePoint.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\api-ms-win-core-file-l2-1-0.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\javafx_iio.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Java\jdk-1.8\jre\legal\jdk\zlib.md.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Java\jre-1.8\lib\fonts\LucidaBrightDemiItalic.ttf.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Office16\ADDINS\Microsoft Power Query for Excel Integrated\bin\Microsoft.Mashup.OleDbInterop.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Office16\ADDINS\PowerPivot Excel Add-in\Microsoft.AnalysisServices.Excel.Common.FrontEnd.dll.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Office16\MSIPC\gl\msipc.dll.mui.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\Office16\OSFPROXY.DLL.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe File created C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\OFFICE16\ACECORE.DLL.tmp 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.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 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe"C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe"1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:1636
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
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Filesize
19KB
MD5e87ffac661e69e7a9569ad822027772b
SHA110e8f13d5b38ba3ba4eb77d710756c6839921fe5
SHA256b1b0ef8df090c6820c5169886bdb7432c41e6fd3857130eb392cb7312b75479f
SHA512da107650ea5f4704f6877a81883a19d09fefa9ae07003ff474ff6d62b747f685ed7e42da1f33174e60ebf44ace2c3f35a0d347bb294a9cbf4b9ab6d2dc045987
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Filesize
100KB
MD5449ee94a5bb80d20211c8a291f93085f
SHA13b069b45ceea0691a48627623234aa534fe40328
SHA256ff579bb66b26a9ad3b76ab36525b43eabec773605e1886d828061bcaaab5e3df
SHA51245392d9eec9671f3ba1bf22cebbac2ae46fb546a61ddc944cdc00cdc9db7abbef18727063ef71bdf67e79f2fd19c163687b659f55b04e01c84613c7e503366eb