Analysis
- max time kernel
150s - max time network
145s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows - submitted
24/08/2026, 03:10
Behavioral task
behavioral1
Sample
d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe
Resource
win10v2004-20260513-en
windows10-2004-x64
5 signatures
150 seconds
Behavioral task
behavioral2
Sample
d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe
Resource
win11ltsc2024-20260709-en
windows11-ltsc_2024-x64
5 signatures
150 seconds
General
- Target d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe
- Size 3.6MB
- Sample260824-dn88basejc
- SHA256 d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98
- MD5 af243a90bb67bd8c248f5d59e46cd1e5
- SHA1 9a941d4faf558bd81306626d34d8d556fa559786
- SHA512 e77a24ebaf45d370dc225c44a087617449e697f922c8039ffce38f5eaca656b82ec11b0377cc327aea65c6fff06fb3e9297a44b1c780025ae16293be1b13bafc
- SSDEEP 49152:rbf24pOK123wBa1c603wsZga2udET1I+51Oj1CvTA+GG6OT75XvPWzAcbYJyXz5p:rzqEv60gsOTGMN6bbjNCZia56g65PRb
- TLSH T196066CB9BA7CB5749440586BB76DAB43DC0C0D4233949B68517E81B4CE98FE0C849FEE
- MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
Malware Config
Signatures
- Detects Cosmu payload 4 IoCs
Cosmu is a worm written in C++.
resource yara_rule behavioral1/memory/4948-0-0x0000000000400000-0x0000000000407000-memory.dmp family_cosmu behavioral1/files/0x00070000000238c4-2.dat family_cosmu behavioral1/files/0x00040000000217d7-6.dat family_cosmu behavioral1/memory/4948-168-0x0000000000400000-0x0000000000407000-memory.dmp family_cosmu - Renames multiple (821) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
- Drops file in Program Files directory 64 IoCs
description ioc Process File created C:\Program Files\Common Files\microsoft shared\ClickToRun\AppvIsvSubsystems32.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\System\msadc\de-DE\msaddsr.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\System\msadc\ja-JP\msadcor.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Globalization.Extensions.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Dynamic.Runtime.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\7-Zip\Lang\nb.txt.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-core-timezone-l1-1-0.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-locale-l1-1-0.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\System\msadc\msdarem.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\System\Ole DB\es-ES\oledb32r.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Security.Cryptography.Primitives.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\insert\insertbase.xml.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ink\ipsdan.xml.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ink\TabIpsps.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Reflection.DispatchProxy.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Net.Quic.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ink\uk-UA\tipresx.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Security.Cryptography.Encoding.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Private.Xml.Linq.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\7-Zip\7-zip.chm.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ink\en-US\ShapeCollector.exe.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ink\es-ES\TipRes.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\Services\verisign.bmp.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\System\msadc\it-IT\msdaprsr.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Diagnostics.FileVersionInfo.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ink\it-IT\InkObj.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\System\wab32.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.ar-sa.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\System\msadc\it-IT\msdaremr.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Diagnostics.TextWriterTraceListener.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Xml.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Globalization.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Threading.Tasks.Dataflow.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\7-Zip\Lang\kab.txt.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ink\es-ES\ShapeCollector.exe.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\System\Ole DB\de-DE\oledb32r.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Private.CoreLib.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\VC\msdia100.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Collections.Specialized.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Numerics.Vectors.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Runtime.Handles.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Runtime.Serialization.Primitives.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Private.DataContractSerialization.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-environment-l1-1-0.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-heap-l1-1-0.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ink\it-IT\InputPersonalization.exe.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Linq.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\7-Zip\Lang\lv.txt.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.cs-cz.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ink\uk-UA\TipTsf.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\System\msadc\de-DE\msadcer.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ink\fr-FR\InkObj.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\7-Zip\Lang\fi.txt.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-string-l1-1-0.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ClickToRun\InspectorOfficeGadget.exe.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Reflection.Extensions.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Runtime.InteropServices.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Net.Security.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\microsoft shared\ink\da-DK\tipresx.dll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Common Files\System\Ole DB\en-US\sqloledb.rll.mui.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Security.Cryptography.Cng.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.IO.FileSystem.AccessControl.dll.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\7-Zip\Lang\lij.txt.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe File created C:\Program Files\Crashpad\settings.dat.tmp d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.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 d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe
Processes
-
C:\Users\Admin\AppData\Local\Temp\d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe"C:\Users\Admin\AppData\Local\Temp\d42ac1d0d8a9c4852f6b6540d834402b98c3c74495f9d420442814e49dd25f98.exe"1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:4948
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
Loading Replay Monitor...
Downloads
- Path C:\$Recycle.Bin\S-1-5-21-668679576-120646659-2289335452-1000\desktop.ini.tmp
- Size 3.6MB
- SHA256 bb94a46a0fdd11acbd4085ae0522a95813695dde8a15a059e98b76f11e428763
- MD5 30513096e7a7aff17c155e216bcee61f
- SHA1 d43a0122382cee5d8c7632b03e7ac8553bdd70fd
- SHA512 ef3f40380abb503dcd18544372473499eb549139326463aed6b83a7db27cc8efff0c6370470288696f1fca565b6a1d46293ad96f5e56f0e121ff0e69d8307c58
- SSDEEP 49152:rbf24pOK123wBa1c603wsZga2udET1I+51Oj1CvTA+GG6OT75XvPWzAcbYJyXz5S:rzqEv60gsOTGMN6bbjNCZia56g65PRo
- TLSH T199066CB9BA7CB5749440586BB76DAB43DC0C0D4233949B68517E81B4CE98FE0C849FEE
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path C:\Program Files\7-Zip\7-zip.dll.tmp
- Size 3.7MB
- SHA256 2927bfce2dce966bf270339f1cc9e0d63cf12ed952a9319573142a869d9618ac
- MD5 9f53ab8ebbfa843e2562ee41f2007766
- SHA1 c7c45df9dc9d9fb8638d022cff8402338b3e1882
- SHA512 a075009e0907de6655fb699af1090cf55d0811dec286ccb76f209a9e7f62539d14a2f8f4c46c6d9f62291ba102e164df6eae1ea48f78aa28d54a333465274756
- SSDEEP 49152:rbf24pOK123wBa1c603wsZga2udET1I+51Oj1CvTA+GG6OT75XvPWzAcbYJyXz5D:rzqEv60gsOTGMN6bbjNCZia56g65PRh
- TLSH T19B066CB9BA7CB574D440586BB65EAF43DC0C0D423B948B68517E81B48E58FE0C849FEE
- MD5 SHA1 SHA512 SSDEEP TLSH