Analysis Overview
SHA256
3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82
Threat Level: Known bad
The file 3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82 was found to be: Known bad.
Malicious Activity Summary
Detects Cosmu payload
Cosmu
Cosmu family
Renames multiple (5047) files with added filename extension
Drops file in Program Files directory
System Location Discovery: System Language Discovery
Unsigned PE
MITRE ATT&CK
Enterprise Matrix V16
Analysis: static1
Detonation Overview
Reported
2025-06-05 08:18
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
2025-06-05 08:18
Reported
2025-06-05 08:20
Platform
win10v2004-20250502-en
Max time kernel
150s
Max time network
138s
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 (5047) files with added filename extension
Drops file in Program Files directory
| Description | Indicator | Process | Target |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\ProjectStdO365R_SubTrial-pl.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\WordCombinedFloatieModel.bin.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\ExcelR_Grace-ul-oob.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\pt-BR\WindowsFormsIntegration.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\mscordaccore_amd64_amd64_7.0.1624.6629.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Globalization.Calendars.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\cs\UIAutomationProvider.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\fr\UIAutomationTypes.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\bin\java-rmi.exe.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\jre\bin\api-ms-win-core-memory-l1-1-0.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\VisioStdR_Retail-ul-phn.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\VVIEWDWG.DLL.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Net.WebSockets.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Java\jre-1.8\lib\fontconfig.bfc.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\MEDIA\CLICK.WAV.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Java\jre-1.8\lib\security\java.policy.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\PackageManifests\AuthoredExtensions.16.xml.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\Microsoft.CSharp.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Data.Common.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Common Files\System\Ole DB\it-IT\sqlxmlx.rll.mui.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\pt-BR\System.Xaml.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\jre\lib\images\cursors\win32_CopyDrop32x32.gif.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\ADDINS\EduWorks Data Streamer Add-In\Microsoft.DataStreamer.Excel.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\Standard2019R_Retail-ul-phn.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\PAGESIZE\PGLBL092.XML.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\main\ko-kr.xml.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\Microsoft.WindowsDesktop.App.deps.json.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\O365BusinessR_SubTest-ul-oob.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\LivePersonaCard\images\default\linkedin_ghost_profile_large.png.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Console.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\tr\UIAutomationProvider.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\wpfgfx_cor3.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\bin\jstat.exe.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\PackageManifests\AppXManifest.90160000-0018-0000-1000-0000000FF1CE.xml.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\Word2019R_Grace-ul-oob.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\ADDINS\Power View Excel Add-in\Microsoft.PowerBI.Diagnostics.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Threading.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\jre\bin\j2pkcs11.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Java\jre-1.8\bin\javaw.exe.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\O365BusinessR_Grace-ppd.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\7-Zip\Lang\de.txt.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.ar-sa.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Net.NameResolution.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\it\WindowsBase.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\O365HomePremR_SubTrial3-ul-oob.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\1036\MSO.ACL.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\Bibliography\Author2String.XSL.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-runtime-l1-1-0.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-utility-l1-1-0.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Common Files\microsoft shared\ink\en-US\InputPersonalization.exe.mui.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Xml.XmlSerializer.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Core.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\System.Xaml.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\de\System.Windows.Input.Manipulations.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\MondoR_ViewOnly_ZeroGrace-ul-oob.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Common Files\microsoft shared\ink\hwrlatinlm.dat.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\fr\System.Windows.Forms.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\cs\PresentationCore.resources.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\jre\bin\j2pcsc.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Java\jre-1.8\lib\tzdb.dat.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Licenses16\VisioProR_Grace-ul-oob.xrm-ms.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\BORDERS\MSART2.BDR.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000018\cardview\lib\native-common\assets\[email protected] | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
| File created | C:\Program Files\Java\jdk-1.8\jre\bin\jp2native.dll.tmp | C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.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\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe | N/A |
Processes
C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe
"C:\Users\Admin\AppData\Local\Temp\3bd983a439a55277a98b813b27babc9b8c0cccf54a088478b8b1cdacf4cbec82.exe"
Network
| Country | Destination | Domain | Proto |
| 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-1-5-21-3623617754-4043701611-775564599-1000\desktop.ini.tmp
| MD5 | 9f85a90dab8278849d2e8b6ba7b464c3 |
| SHA1 | 1ef8111001c2b5546714fe5aab937fe81944f0fc |
| SHA256 | 50476bf3efb60a4b37f68909efdafe310c0bb8fdcf3585d0b2ff5f109681f56f |
| SHA512 | 706c9aa46883bf3034e6d823c4c9682463aa4734145e147993109f36dac77a320ebb3a0a76788ece7ad594dad187bd9006287b3f376d88153e35004ce7e8afe2 |
C:\b96a7bef2438b67e1aee\2010_x86.log.html.tmp
| MD5 | 929d1db62a8da09b40bdd5f45b310eb5 |
| SHA1 | e4c5ff0253b48275ee0c99d8ee4ab338d8f7d6f6 |
| SHA256 | 00f681e4b994f2e05b1f1254882d74fcb45ba6bffa23601c0aadbfa4c19f37e2 |
| SHA512 | d8f6cb6cf1430fc7662f41d3e0722bb1b6cadd1a1de75d0a82ea263e58e462285b0532741eab8b228d099d6a66306328377e05b8ea2bbca236a287e5ec23767e |