Analysis
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max time kernel
150s -
max time network
128s -
platform
windows11-21h2_x64 -
resource
win11-20250502-en -
resource tags
arch:x64arch:x86image:win11-20250502-enlocale:en-usos:windows11-21h2-x64system -
submitted
29/05/2025, 10:04
Behavioral task
behavioral1
Sample
28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe
Resource
win10v2004-20250502-en
Behavioral task
behavioral2
Sample
28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe
Resource
win11-20250502-en
General
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Target
28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe
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Size
34KB
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MD5
c723f0584ef526efa1f1eaea94df14d8
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SHA1
b984a485db4a2f68effbe007c5f78585ddc53b0a
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SHA256
28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f
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SHA512
ac3db58129c3e04a214ef3deee51a01bb2298523979724e1ddbd27a3ffc46bc5851301226592539453ff7f245a66c7d15e34a0751d360f94ddda69f2ef022bb9
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SSDEEP
768:s7BlpppARFbhdLz8ae+rOn8ae+rO+4500n1kJ00n1khxhxz:s7ZppApdII+49101az1
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 behavioral2/files/0x000b00000002ac39-1.dat family_cosmu behavioral2/files/0x00040000000270b6-5.dat family_cosmu -
Renames multiple (5348) 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\7-Zip\Lang\nl.txt.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Data.DataSetExtensions.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\tr\WindowsBase.resources.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\PenImc_cor3.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jdk-1.8\jre\lib\images\cursors\win32_MoveNoDrop32x32.gif.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\MondoR_ConsumerSub_Bypass30-ul-oob.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365ProPlusR_Subscription2-ul-oob.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000018\cardview\lib\native-common\assets\[email protected] 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Net.WebSockets.Client.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\pt-BR\PresentationCore.resources.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\de\System.Windows.Forms.Primitives.resources.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jdk-1.8\jre\lib\security\blacklisted.certs.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365BusinessR_SubTrial-ul-oob.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\PowerPoint2019R_Retail-ppd.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProjectStdXC2RVL_KMS_ClientC2R-ppd.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\OFFICE16\Csi.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Runtime.CompilerServices.Unsafe.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\fr\UIAutomationProvider.resources.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jdk-1.8\jre\lib\deploy\splash_11-lic.gif.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\HomeBusiness2019DemoR_BypassTrial180-ppd.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365SmallBusPremR_SubTrial4-ul-oob.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Common Files\System\msadc\it-IT\msdaremr.dll.mui.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jre-1.8\bin\JavaAccessBridge-64.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_Trial2-ul-oob.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365ProPlusR_SubTrial1-pl.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\SkypeforBusinessR_Trial-pl.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioProVL_MAK-pl.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Office16\ADDINS\Microsoft Power Query for Excel Integrated\bin\Microsoft.Mashup.Container.NetFX40.exe.config.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Security.Cryptography.OpenSsl.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\es\System.Windows.Forms.Primitives.resources.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jre-1.8\bin\java_crw_demo.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\Excel2019VL_MAK_AE-pl.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Collections.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jdk-1.8\legal\jdk\jopt-simple.md.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jre-1.8\bin\mlib_image.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\OutlookR_Trial-pl.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\7-Zip\Lang\mng.txt.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jre-1.8\bin\jsdt.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\PowerPointR_Grace-ul-oob.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Office16\MSIPC\cs\msipc.dll.mui.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000018\cardview\lib\native-common\assets\[email protected] 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\7-Zip\7zCon.sfx.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProfessionalR_OEM_Perp-pl.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioStdVL_MAK-ppd.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Collections.Concurrent.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Threading.Timer.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\zh-Hans\WindowsBase.resources.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jdk-1.8\bin\schemagen.exe.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\ko\UIAutomationProvider.resources.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jdk-1.8\bin\tnameserv.exe.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\jjs.exe.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\HomeStudentVNextR_Trial-ul-oob.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\OFFICE16\1033\README.HTM.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\fr\UIAutomationClientSideProviders.resources.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\it\PresentationUI.resources.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\zh-Hans\UIAutomationTypes.resources.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\cs\PresentationUI.resources.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\zh-Hant\UIAutomationClientSideProviders.resources.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jre-1.8\bin\bci.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Java\jre-1.8\bin\server\classes.jsa.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365EduCloudEDUR_Subscription-ppd.xrm-ms.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Common Files\System\Ole DB\de-DE\msdasqlr.dll.mui.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Office16\ADDINS\PowerPivot Excel Add-in\Microsoft.DataWarehouse.Interfaces.DLL.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe File created C:\Program Files\Microsoft Office\root\Office16\msvcp140.dll.tmp 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.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 28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe"C:\Users\Admin\AppData\Local\Temp\28c985e09a5844317c11719cb45e2cdb7e59aace44f368d17b5093699cf70a1f.exe"1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:4452
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
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Filesize
35KB
MD5fc49bf11d74ebb3a749184129178f6c8
SHA163568fd6b927dab55c9dca50301a6bc6cc120ed2
SHA25628f7b6bf7fde756cda35e57fea10ebcd6434d80923c453ffdbd96aa5d6759243
SHA512af4228ac59a32d21c4496f2b4c4aa6a49639792e97753f12ffb84655990b1d032df1b5478fec8778819b0067ffbf6fed5477cbdf2836bad0f6e74b577fe38c34
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Filesize
115KB
MD5cb9bbb5159bbe5d1de38ddcfa27b990a
SHA10e64dff827cb6b66241036007b543d5ba0e26bc6
SHA256ff7fcc5cb526996d5fea60ba2fe4fbfd0c7d6e3d6714a1c613f723af72c36902
SHA51230bd2a369dc4605d5175bd65d62aaeece2776bf2b68d4497bd3df1f8e905d6f0167bedf9b38158d0c58463cb8d3a5118749235558f5750b574c9cfd5f0d447d0