Analysis
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max time kernel
150s -
max time network
135s -
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, 11:55
Static task
static1
Behavioral task
behavioral1
Sample
121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe
Resource
win10v2004-20250502-en
General
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Target
121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe
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Size
30KB
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MD5
ad50c4198037eb09a5487d51412dfbe0
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SHA1
fabb445bb8121f9bfa0c56a310d06ff975e35f91
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SHA256
121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9
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SHA512
cc469d2570cb2a0114b6948f0873cee95e5c33466659031c9b9f0169664df4f81d9694b1eb59a186dadd00c56c2a4e4b88434e3d1d42ae832db87196e7531a09
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SSDEEP
768:uZ4FLz8ae+rOn8ae+rO+4500n1kJ00n1kZ/O:uGII+491011
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/4028-795-0x0000000000400000-0x0000000000407000-memory.dmp family_cosmu -
Renames multiple (5124) 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\Microsoft Office\root\Licenses16\VisioPro2019MSDNR_Retail-ul-oob.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioStd2019R_OEM_Perp-ul-phn.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\PAGESIZE\PGMN020.XML.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\oskpred\oskpredbase.xml.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Google\Chrome\Application\133.0.6943.60\Extensions\external_extensions.json.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\kinit.exe.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Fonts\TrebuchetMs.xml.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365ProPlusR_SubTrial1-pl.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\PowerPoint2019R_Grace-ul-oob.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\ProjectStdO365R_SubTrial-ul-oob.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioStdVL_KMS_Client-ppd.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\7-Zip\Lang\zh-cn.txt.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Xml.Linq.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\System.IO.Packaging.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\zip.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioProVL_MAK-ul-phn.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioStdCO365R_Subscription-ul-oob.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioStdXC2RVL_KMS_ClientC2R-ul-oob.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\PAGESIZE\PGMN107.XML.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\mscorrc.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\cs\System.Windows.Controls.Ribbon.resources.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\Publisher2019R_OEM_Perp-ul-oob.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\PAGESIZE\PGLBL026.XML.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\react-native-win32.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\VVIEWER.DLL.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Threading.Overlapped.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\Outlook2019R_OEM_Perp-ul-oob.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\VisioProMSDNR_Retail-pl.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Common Files\System\msadc\msdarem.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\de\WindowsFormsIntegration.resources.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\zh-Hans\Microsoft.VisualBasic.Forms.resources.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\MondoR_SubTest-ul-oob.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365HomePremR_SubTrial1-ul-oob.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\System.Drawing.Common.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Java\jdk-1.8\jre\legal\jdk\cldr.md.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Integration\C2RManifest.dcfmui.msi.16.en-us.xml.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365HomePremR_SubTrial1-ppd.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\PROTTPLV.XLS.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\7-Zip\Lang\lt.txt.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\OutlookR_OEM_Perp-pl.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\Professional2019R_Retail-ul-phn.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\ja\System.Windows.Forms.Design.resources.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Java\jdk-1.8\jre\bin\jaas_nt.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\ADDINS\Power Map Excel Add-in\VISUALIZATIONCOMMON.DLL.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\api-ms-win-crt-runtime-l1-1-0.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000018\cardview\lib\native-common\assets\cardview-addtotable.png.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\it\System.Windows.Forms.Primitives.resources.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Java\jdk-1.8\include\win32\bridge\AccessBridgeCalls.h.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Java\jre-1.8\bin\jp2launcher.exe.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Java\jre-1.8\lib\security\blacklist.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\WINWORD_K_COL.HXK.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\msoia.exe.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Common Files\microsoft shared\ink\ipsen.xml.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Reflection.Extensions.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\es\UIAutomationClient.resources.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Google\Chrome\Application\133.0.6943.60\133.0.6943.60.manifest.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Google\Chrome\Application\133.0.6943.60\Locales\fr.pak.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\1033\offsymk.ttf.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Office16\mfc140u.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\System.Drawing.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\zh-Hans\WindowsFormsIntegration.resources.dll.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Google\Chrome\Application\133.0.6943.60\Locales\es-419.pak.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Java\jre-1.8\legal\jdk\pkcs11cryptotoken.md.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe File created C:\Program Files\Microsoft Office\root\Licenses16\O365SmallBusPremR_SubTrial3-ul-oob.xrm-ms.tmp 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.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 121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe"C:\Users\Admin\AppData\Local\Temp\121f20c82d0c2e7fd44e6f52e78cc84ed80dca691a7a49a79796036a3d15c0f9.exe"1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:4028
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
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Filesize
31KB
MD5a216a250f2eb783641675ba12d89bdea
SHA12866599ea8b2b6542ba547bb79e49703f8fe09ab
SHA2566a70d0b30e7eba1904ac641c46fe9171efc24b0a713978a879e9a1ee8c49324f
SHA512452acdd610a1da3c7bd2a684edd1041471c4e6a77a4d62b1cb24d9308479cde80580763c69974173e03fb9b79060ed68bb29861bf71738356036f6babca0d497
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Filesize
112KB
MD5c80f6af449d4ac52255e610815b3e198
SHA1db6ca86dcaf2ff82b17a4c19205f3c25c92dde1d
SHA256b6ffe87e5240acb3a0a35720ffc895cc091a06a643dc0045f30e28a61d515744
SHA51262e3edff9a5ed635aa2c2f756267f01696621a8f4d8f32637892ee725a3f75ceb9f9f669c176d717faed2de597a15ce52e0f8adc3d05638919a058585363a826