cosmu | 9efbe8c9c2c640df2cc4b20f80df7487970d550d14ec30f6fb9a620ee1e1f9d6

Analysis

max time kernel
150s
max time network
126s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
02/10/2026, 08:13

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General

Target
2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
Size 2.6MB
Sample261002-j4f5csde39
SHA256 9efbe8c9c2c640df2cc4b20f80df7487970d550d14ec30f6fb9a620ee1e1f9d6
MD5 9894c9350c97e337af72c9024d17f097
SHA1 b6dda551c2defe60e7cf92a612444c5fc8d50a34
SHA512 cc00e5a51995ba9e36d1be3654a70dcaa50556c292daa6f663f670bfcaab749f857a44f26de4209784a2e13585d3e645c6e3bf6116f2e10e884121745e9263aa
SSDEEP 49152:GKFOI1ioB32Y/O6CGGsd05Lwin6/ZS1tRwTLQM8mS:BAI1iS32Y/O6CGvd05LwinqS1tRILQMG
TLSH
T18AC59E19F9C0D66CF24E64B612DE2C4C5DBDBB59FFC8C60E821B3B5C9160BAA3141AD4
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery cosmu ransomware worm

Malware Config

Signatures

Family: Cosmu
Cosmu is a Windows worm written in C++.
worm cosmu

Detects Cosmu payload 4 IoCs

Cosmu is a worm written in C++.

resource	yara_rule
behavioral2/memory/4248-0-0x0000000000400000-0x000000000040A000-memory.dmp	family_cosmu
behavioral2/files/0x000c000000019cb7-2.dat	family_cosmu
behavioral2/files/0x00030000000003b1-5.dat	family_cosmu
behavioral2/memory/4248-197-0x0000000000400000-0x000000000040A000-memory.dmp	family_cosmu

Detects executables packed with eXPressor 4 IoCs

resource	yara_rule
behavioral2/memory/4248-0-0x0000000000400000-0x000000000040A000-memory.dmp	INDICATOR_EXE_Packed_eXPressor
behavioral2/files/0x000c000000019cb7-2.dat	INDICATOR_EXE_Packed_eXPressor
behavioral2/files/0x00030000000003b1-5.dat	INDICATOR_EXE_Packed_eXPressor
behavioral2/memory/4248-197-0x0000000000400000-0x000000000040A000-memory.dmp	INDICATOR_EXE_Packed_eXPressor

Renames multiple (628) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

Drops file in Program Files directory 64 IoCs

description	ioc	Process
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\mscordaccore_amd64_amd64_6.0.2724.6912.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\co.txt.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\vccorlib140.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\oskclearui.xml.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\ja-JP\tabskb.dll.mui.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Reflection.DispatchProxy.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Resources.Writer.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Runtime.CompilerServices.VisualC.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Runtime.Loader.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVManifest.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.kk-kz.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\i640.cab.cat.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\VSTO\10.0\1033\VSTOLoaderUI.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\System\ado\it-IT\msader15.dll.mui.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\System\wab32.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\mscorrc.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Net.Quic.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\fy.txt.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\tk.txt.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.he-il.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\msvcr120.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\System\msadc\it-IT\msdaremr.dll.mui.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\netstandard.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.IO.FileSystem.DriveInfo.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Runtime.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\pa-in.txt.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\ta.txt.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\VSTO\vstoee.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\System\ado\msado28.tlb.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Text.Json.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Xml.XmlSerializer.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\mscordaccore_amd64_amd64_7.0.1624.6629.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Collections.NonGeneric.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\cs.txt.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\cs-CZ\tipresx.dll.mui.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\insert\insertbase.xml.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\nn-NO\tipresx.dll.mui.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\qps-plocm\tipresx.dll.mui.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\VC\msdia90.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\api-ms-win-crt-locale-l1-1-0.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Net.WebHeaderCollection.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\af.txt.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\he.txt.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\sk.txt.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\th.txt.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-utility-l1-1-0.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.fr-fr.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.hi-in.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\cy-GB\tipresx.dll.mui.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\an.txt.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\br.txt.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\msvcp120.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\symbols\ja-jp-sym.xml.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\System\Ole DB\msdasqlr.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\api-ms-win-core-fibers-l1-1-0.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\api-ms-win-crt-filesystem-l1-1-0.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Collections.NonGeneric.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\api-ms-win-core-file-l1-1-0.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Net.WebProxy.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Private.Xml.Linq.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Security.Principal.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Web.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\netstandard.dll.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\InspectorOfficeGadget.exe.tmp	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.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.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe

C:\Users\Admin\AppData\Local\Temp\2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-01_9894c9350c97e337af72c9024d17f097_elex_wannacry.exe"
1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:4248

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

desktop.ini.tmp

Path C:\$Recycle.Bin\S-1-5-21-461973139-3212354679-1508698038-1000\desktop.ini.tmp
Size 2.6MB
SHA256 dc56ae8e373d21c6a77badec8b7a07c9a6f702e726df17995fc805dad382f57b
MD5 6e7a35ef7845b2e96f69b8ff44c25eb8
SHA1 2239ef4d32674058d14fc57dea0f6a2bf06ef0db
SHA512 20acd59cccdc75c6530645b615c40d3879d20d03fd5c5e93f2fe56030df1abc08678c86ca2a06121df8f7f3ee23a54b0219c8924ea5d404cef482e688fc2498e
SSDEEP 49152:GKFOI1ioB32Y/O6CGGsd05Lwin6/ZS1tRwTLQM8mW:BAI1iS32Y/O6CGvd05LwinqS1tRILQMK
TLSH
T12EC59E19F9C0D66CF24E64B612DE2C4C5DBDBB59FFC8C60E821B3B5C9160BAA3141AD4
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

7-zip.chm.tmp

Path C:\Program Files\7-Zip\7-zip.chm.tmp
Size 2.7MB
SHA256 9ab9efca477215f1572fe03bbec8db8c8e7bdb832599095311d4074d8bceb1e7
MD5 7ac1acd5d42068265a0ffd6a4fef7c5d
SHA1 051cf559e8df3a54b08ebf993dd2910d5087d5e1
SHA512 b0e1a3da6b4a189a8fd675fec136e152f23411405bfddb5cef1565d3318330c67ac26726e6d49bfdfdac01bda96bb3f83ea217730521af91d0ec8a52f58ded5d
SSDEEP 49152:GKFOI1ioB32Y/O6CGGsd05Lwin6/ZS1tRwTLQM8mCwGd:BAI1iS32Y/O6CGvd05LwinqS1tRILQMI
TLSH
T10AD5AF19F9C0D66CF24E65B612DE2C4C5DBDBB59FFC8C60E820B3B5C9160BAA3141AD4
MD5 SHA1 SHA512 SSDEEP TLSH