cosmu | 90c0205e41c154583374ffa18fdca5b44979bf4710122ebdee6d2619ddce4456

Analysis

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

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
20/10/2026, 07:47

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General

Target
2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
Size 72KB
Sample261020-jmtdcsa12q
SHA256 90c0205e41c154583374ffa18fdca5b44979bf4710122ebdee6d2619ddce4456
MD5 3b94d641a961b2be4dc91cbba44882a4
SHA1 45b2bd554f33fa6efd6c42e410a98daeeb9e8efe
SHA512 e76d794e2b584071a6a17f1e35aa6bd5875e9f3345233f4f84a3ddd0ece086f8f568dea7a4f08d78e1f2b4a6bae8861b8f27064543e864eed3f8b253da1fe72a
SSDEEP 768:R7BlpztpARFbh6qM6pim2GvZKOUcUQqgJ2z4gdScVkdTGg2IT6Wt4nthT:R7Z5pAp6qM6pNZDDqgJ20gdKEUTzs
TLSH
T1DC737D2B7FC89442D24AC170A97EB5E18F62B035B8C3EF8F0B59AC1C595325A5C8C56F
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/4896-0-0x0000000000400000-0x000000000040A000-memory.dmp	family_cosmu
behavioral2/files/0x000d00000001b84c-2.dat	family_cosmu
behavioral2/files/0x00030000000003a8-5.dat	family_cosmu
behavioral2/memory/4896-788-0x0000000000400000-0x000000000040A000-memory.dmp	family_cosmu

Detects executables packed with eXPressor 4 IoCs

resource	yara_rule
behavioral2/memory/4896-0-0x0000000000400000-0x000000000040A000-memory.dmp	INDICATOR_EXE_Packed_eXPressor
behavioral2/files/0x000d00000001b84c-2.dat	INDICATOR_EXE_Packed_eXPressor
behavioral2/files/0x00030000000003a8-5.dat	INDICATOR_EXE_Packed_eXPressor
behavioral2/memory/4896-788-0x0000000000400000-0x000000000040A000-memory.dmp	INDICATOR_EXE_Packed_eXPressor

Renames multiple (4726) 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\Microsoft Office\root\Document Themes 16\Theme Effects\Smokey Glass.eftx.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\CONVERT\OLAPPT.FAE.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\clretwrc.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\MondoVL_KMS_Client-ul.xrm-ms.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\rtscom.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Common Files\System\msadc\fr-FR\msadcer.dll.mui.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\fr\Microsoft.VisualBasic.Forms.resources.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Java\jre-1.8\lib\cmm\LINEAR_RGB.pf.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\ProjectStd2019VL_KMS_Client_AE-ul-oob.xrm-ms.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Common Files\System\Ole DB\sqlxmlx.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Runtime.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\System.Threading.AccessControl.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\PersonalPipcR_OEM_Perp-ul-oob.xrm-ms.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\de-DE\TipRes.dll.mui.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\zh-Hant\System.Windows.Forms.resources.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Google\Chrome\Application\140.0.7339.81\Locales\he.pak.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Java\jre-1.8\lib\flavormap.properties.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\ProPlusR_OEM_Perp4-ppd.xrm-ms.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\1033\officeinventoryagentlogon.xml.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\1033\WINWORD.HXS.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\ADDINS\Power Map Excel Add-in\VISUALIZATIONCHART.DLL.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\es\PresentationCore.resources.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\lib\psfont.properties.ja.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Java\jre-1.8\bin\api-ms-win-crt-process-l1-1-0.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Java\jre-1.8\release.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\Bibliography\Style\ISO690.XSL.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\BORDERS\MSART14.BDR.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\FORMS\1033\TASKACCS.ICO.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Runtime.Serialization.Json.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\ru\PresentationUI.resources.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\cs\UIAutomationTypes.resources.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\es\UIAutomationTypes.resources.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\lib\javaws.jar.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_Retail3-pl.xrm-ms.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\VisioStd2019R_Retail-ul-oob.xrm-ms.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\Bibliography\Style\GostName.XSL.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Java\jre-1.8\bin\api-ms-win-core-console-l1-2-0.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\FPA_w1\WA104381125.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\LogoImages\WinWordLogoSmall.contrast-white_scale-180.png.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.IO.Pipes.AccessControl.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Net.HttpListener.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\release.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\1033\WacLangPack2019Eula.txt.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\cpprestsdk.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\LogoImages\ExcelLogoSmall.contrast-black_scale-80.png.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Xml.XmlSerializer.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\GKPowerPoint.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\ProPlusR_OEM_Perp-ul-phn.xrm-ms.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\SharedPerformance.man.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\main.xml.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\api-ms-win-core-synch-l1-1-0.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVPolicy.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\bin\glib-lite.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Java\jre-1.8\legal\javafx\glib.md.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\O365ProPlusEDUR_SubTrial-pl.xrm-ms.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\ProjectPro2019VL_MAK_AE-ppd.xrm-ms.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\sl-SI\tipresx.dll.mui.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\Microsoft.VisualBasic.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\de\UIAutomationTypes.resources.dll.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\lib\charsets.jar.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Java\jre-1.8\lib\security\public_suffix_list.dat.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_Retail2-pl.xrm-ms.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\CONVERT\1033\LOCALDV.DLL.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
File created	C:\Program Files\DismountConfirm.vsw.tmp	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_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	2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe

C:\Users\Admin\AppData\Local\Temp\2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-20_3b94d641a961b2be4dc91cbba44882a4_elex_wannacry.exe"
1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:4896

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-1-5-21-4057491610-3392471755-192832105-1000\desktop.ini.tmp
Size 72KB
SHA256 8b4ecb0a69d0a954dbe3017b27f1b082df70199c50dcbb47cb65dcaa05bf2535
MD5 825552024442ca7bf0370c071d0ebe8a
SHA1 1ad1ad4067c600e33b0df0580bc7539722e4c2d0
SHA512 ee088c11b717cebe35a6239126af7664a64afc7c561c2f15b97ec4d4ea29b61b3b5be1fe85554b63f98de1dd05e966b422a689466909b878ecb83ea2e7f50611
SSDEEP 768:R7BlpztpARFbh6qM6pim2GvZKOUcUQqgJ2z4gdScVkdTGg2IT6Wt4nthMm:R7Z5pAp6qM6pNZDDqgJ20gdKEUTzG
TLSH
T16C737D2B7FC89442D24A8170A97EB5F18F62B035B8C3EF8F0B59AC1C595325A5C8C56F
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

7-zip.chm.tmp

Path C:\Program Files\7-Zip\7-zip.chm.tmp
Size 189KB
SHA256 8502b61842df1e36377de58f9dd633c764c2bcbd2af4953242ad657439810b2a
MD5 5f161c5cce4c36a2491cca3d6a863d40
SHA1 acd4cfb738100d7e5afe089630cc24d1dfeff721
SHA512 c4db15928502c86cf736a726c00077bef8917434e5df330c7c67b653d9316a4930278d2ca0abe0a30622208752933cf30a5a2832da6944e2aee1677ce2be2f2f
SSDEEP 3072:75Wp6qM6FDDxkUTYwxMxdrwdaEMePCUlZVpnwzuGSsOOOJ:UO618wxMxFELMO9wapsOZJ
TLSH
T1D0147B273FC45401D24A8174A97AB4FEAF62B431B8C3DF8F1B59AC0D599325A6C8C16F
MD5 SHA1 SHA512 SSDEEP TLSH