Analysis Overview
SHA256
256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75
Threat Level: Known bad
The file 256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75 was found to be: Known bad.
Malicious Activity Summary
Cosmu family
Detects Cosmu payload
Cosmu
Renames multiple (5329) files with added filename extension
Drops file in Program Files directory
Unsigned PE
System Location Discovery: System Language Discovery
MITRE ATT&CK
Enterprise Matrix V16
Analysis: static1
Detonation Overview
Reported
2025-05-29 10:02
Signatures
Cosmu family
Detects Cosmu payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2025-05-29 10:02
Reported
2025-05-29 10:05
Platform
win10v2004-20250502-en
Max time kernel
149s
Max time network
137s
Command Line
Signatures
Cosmu
Cosmu family
Detects Cosmu payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Renames multiple (5329) files with added filename extension
Drops file in Program Files directory
| Description | Indicator | Process | Target |
| File created | C:\Program Files\Common Files\microsoft shared\ClickToRun\concrt140.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Threading.Thread.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\it\System.Windows.Forms.Design.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\Office16\OSPPREARM.EXE.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\es\System.Xaml.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\tr\UIAutomationClient.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\fr\System.Windows.Controls.Ribbon.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Java\jre-1.8\bin\glass.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\O365ProPlusR_SubTrial3-pl.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\VisioProR_OEM_Perp-pl.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\main\ja-jp.xml.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.IO.FileSystem.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\PresentationUI.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\jre\bin\jfr.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\jre\lib\images\cursors\win32_LinkDrop32x32.gif.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Java\jre-1.8\bin\msvcp140_2.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\O365EduCloudEDUR_SubTrial-ppd.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\LogoImages\ExcelLogoSmall.contrast-white_scale-140.png.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\ja\UIAutomationProvider.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\ko\System.Windows.Controls.Ribbon.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\jre\bin\kinit.exe.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\O365BusinessR_Grace-ul-oob.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\PersonalPipcR_OEM_Perp-ul-oob.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\vfs\Fonts\private\NIRMALA.TTF.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Net.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Threading.ThreadPool.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_Grace-ppd.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\MSIPC\uk\msipc.dll.mui.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Common Files\System\ado\msadomd28.tlb.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Net.WebHeaderCollection.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Colors\Red Violet.xml.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\MondoR_SubTrial2-pl.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\O365BusinessR_SubTrial-ppd.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\api-ms-win-crt-multibyte-l1-1-0.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\OFFICE16\api-ms-win-core-processthreads-l1-1-1.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\7-Zip\Lang\hr.txt.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.he-il.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Common Files\System\ja-JP\wab32res.dll.mui.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\it\UIAutomationTypes.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\Microsoft.WindowsDesktop.App.deps.json.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\jre\legal\javafx\mesa3d.md.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\Excel2019R_Retail-ppd.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\ORGCHART.EXE.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Common Files\microsoft shared\ink\mshwjpn.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\api-ms-win-crt-private-l1-1-0.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\tr\PresentationCore.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\legal\jdk\cryptix.md.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\lib\tools.jar.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\BORDERS\MSART10.BDR.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Templates\1033\WidescreenPresentation.potx.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\vfs\Fonts\private\BOOKOSI.TTF.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\api-ms-win-core-fibers-l1-1-0.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\zh-Hans\WindowsFormsIntegration.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\VisioPro2019VL_MAK_AE-ppd.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Net.ServicePoint.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\jre\bin\api-ms-win-core-file-l2-1-0.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\jre\bin\javafx_iio.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\jre\legal\jdk\zlib.md.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Java\jre-1.8\lib\fonts\LucidaBrightDemiItalic.ttf.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\ADDINS\Microsoft Power Query for Excel Integrated\bin\Microsoft.Mashup.OleDbInterop.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\ADDINS\PowerPivot Excel Add-in\Microsoft.AnalysisServices.Excel.Common.FrontEnd.dll.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\MSIPC\gl\msipc.dll.mui.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\OSFPROXY.DLL.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\OFFICE16\ACECORE.DLL.tmp | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe | N/A |
Processes
C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe
"C:\Users\Admin\AppData\Local\Temp\256b244320bdb456feb3bccac7cd870698b1fa53b1fd32b39f02e03003284b75.exe"
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 8.8.8.8:53 | c.pki.goog | udp |
| NL | 142.250.27.94:80 | c.pki.goog | tcp |
Files
C:\$Recycle.Bin\S-1-5-21-343936533-1262634978-1863872812-1000\desktop.ini.tmp
| MD5 | e87ffac661e69e7a9569ad822027772b |
| SHA1 | 10e8f13d5b38ba3ba4eb77d710756c6839921fe5 |
| SHA256 | b1b0ef8df090c6820c5169886bdb7432c41e6fd3857130eb392cb7312b75479f |
| SHA512 | da107650ea5f4704f6877a81883a19d09fefa9ae07003ff474ff6d62b747f685ed7e42da1f33174e60ebf44ace2c3f35a0d347bb294a9cbf4b9ab6d2dc045987 |
C:\f21fae8705b262c53286e8\2010_x86.log.html.tmp
| MD5 | 449ee94a5bb80d20211c8a291f93085f |
| SHA1 | 3b069b45ceea0691a48627623234aa534fe40328 |
| SHA256 | ff579bb66b26a9ad3b76ab36525b43eabec773605e1886d828061bcaaab5e3df |
| SHA512 | 45392d9eec9671f3ba1bf22cebbac2ae46fb546a61ddc944cdc00cdc9db7abbef18727063ef71bdf67e79f2fd19c163687b659f55b04e01c84613c7e503366eb |