cosmu | c577fe57e7bad7f46d11b9f07fb5cae2b109c085de6964accefbac2784b53278

Analysis

max time kernel
150s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
28/07/2026, 19:08

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General

Target
2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
Size 70KB
Sample260728-xtcabatdlg
SHA256 c577fe57e7bad7f46d11b9f07fb5cae2b109c085de6964accefbac2784b53278
MD5 17ffa9671fa98403037621326c88ef81
SHA1 798441ec9a35223a37379ee634202978c1bbb08d
SHA512 820fcdae3ebf2731ed1b595b9b61ea6e12c1153a7280b4b29ab8b7da8f94e3c7ea9eb5b45ecaa944d208b9998f4a0aa95d6d7f0355ef73ecd5a0bff3af239b3c
SSDEEP 1536:/7ZQpApze+eJfFpsJOfFpsJ5DTKP2awclvmxaKP2awclvmxc:9QWpze+eJfFpsJOfFpsJ5D+P2awclvmZ
TLSH
T1F2634B0BD734D053D2AD5B30AD32B5B4D992015D612EFDEFBE1ACC836A248B5A60FD06
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/1828-0-0x0000000000400000-0x0000000000408000-memory.dmp	family_cosmu
behavioral2/files/0x000a000000006910-2.dat	family_cosmu
behavioral2/files/0x0005000000016b47-6.dat	family_cosmu
behavioral2/memory/1828-555-0x0000000000400000-0x0000000000408000-memory.dmp	family_cosmu

Renames multiple (4292) 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\7.0.16\System.IO.IsolatedStorage.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\zh-Hant\UIAutomationClient.resources.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Client\api-ms-win-crt-time-l1-1-0.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\PowerPoint2019R_Grace-ppd.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\ProPlus2019XC2RVL_KMS_ClientC2R-ul-oob.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\bn.txt.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\System.CodeDom.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\bin\api-ms-win-crt-convert-l1-1-0.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Java\jre-1.8\bin\jfxmedia.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\ProjectProR_Retail2-ul-phn.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\1033\EntityPickerIntl.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-time-l1-1-0.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Runtime.Serialization.Formatters.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\zh-Hant\UIAutomationClient.resources.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\bin\pack200.exe.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\Excel2019R_Retail-ul-oob.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\MondoR_Retail-ppd.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\Standard2019R_Grace-ppd.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\1033\LyncBasic_Eula.txt.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\lt-LT\tipresx.dll.mui.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Linq.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\tr\PresentationUI.resources.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\bin\api-ms-win-crt-runtime-l1-1-0.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\lib\fonts\LucidaTypewriterBold.ttf.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\lib\jvm.lib.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\AccessR_OEM_Perp-ul-oob.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\ADDINS\EduWorks Data Streamer Add-In\Microsoft.VisualStudio.OLE.Interop.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\VGX\VGX.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Net.Requests.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\tr\WindowsFormsIntegration.resources.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\System.Windows.Forms.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\javafx-src.zip.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\PackageManifests\AppXManifest.90160000-0090-0000-1000-0000000FF1CE.xml.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\VisioStdR_Grace-ul-oob.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\1033\TellMeOutlookMailRead.nrr.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.ComponentModel.Primitives.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Globalization.Calendars.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\System.IO.Packaging.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\HomeBusiness2019R_OEM_Perp-ul-oob.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\SkypeforBusinessR_Retail-ul-phn.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Xml.XmlDocument.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\LICENSE.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\main\base_heb.xml.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Security.Principal.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\legal\javafx\gstreamer.md.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\VisioProR_Trial-ul-oob.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\1033\WINWORD_COL.HXT.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\ADDINS\PowerPivot Excel Add-in\Microsoft.Excel.DataWarehouse.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Runtime.Handles.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\PublisherR_Retail-ul-phn.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\VisioPro2019R_OEM_Perp-pl.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\api-ms-win-crt-convert-l1-1-0.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\ko\System.Windows.Input.Manipulations.resources.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\bin\server\classes.jsa.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\Office16\OSPP.HTM.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\O365HomePremR_Subscription5-ppd.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\PersonalPipcR_Grace-ul-oob.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\ja\System.Windows.Forms.Primitives.resources.dll.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\bin\orbd.exe.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\PackageManifests\AppXManifest.90160000-001A-0409-1000-0000000FF1CE.xml.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\MondoR_BypassTrial180-ul-oob.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\MondoR_KMS_Automation-ul.xrm-ms.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\Microsoft Office\root\Office16\1033\offsymsl.ttf.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
File created	C:\Program Files\7-Zip\7z.sfx.tmp	2026-07-28_17ffa9671fa98403037621326c88ef81_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	2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe

C:\Users\Admin\AppData\Local\Temp\2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-28_17ffa9671fa98403037621326c88ef81_elex_wannacry.exe"
1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:1828

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-1-5-21-189034102-168398478-1159367937-1000\desktop.ini.tmp
Size 70KB
SHA256 902247ed7562cafc53f270a408ef5a1260f7143b8cbc4344658cb1f1e256dd89
MD5 83b8a0452eabfc696dead1ab3b4a2aac
SHA1 37136516097d4991a109f63b1bb51e6f8d9ddd9b
SHA512 17c83d97343521fde1712fc3528cd4f01ba50ee951fcf240e3cc2cae72691530123b6d1844c3d41b0c4642eb3eac3f7de49f88787045478a3ff129f1fcaa4101
SSDEEP 1536:/7ZQpApze+eJfFpsJOfFpsJ5DTKP2awclvmxaKP2awclvmxB:9QWpze+eJfFpsJOfFpsJ5D+P2awclvmE
TLSH
T184633B0BD734D053D2AC5B30AD32B5B4D992015D612EFDEBFE16CC836A248B5A60FD1A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

7-zip.dll.tmp

Path C:\Program Files\7-Zip\7-zip.dll.tmp
Size 169KB
SHA256 ddce539d37af0d4e25bf32343cedf6c7a0b2e20d821dd447cc7009ea4fac7321
MD5 7d14615bcd376e932d045ff0fb5ae0a7
SHA1 cf41cce8d4c2243d6b8663ab56881bb20f96727c
SHA512 c828354ceb7b90a5ba72625d899aa114ab1c105ee7c83b62984cd1788ec9a7a0d774c441d41ff604e0c6ca0b1191611d0c48d28d74b7f79323bf3fc39ed905ca
SSDEEP 3072:9QWpze+eJfFpsJOfFpsJ5D+P2awclvmxrP2awclvmxZ5ZMfTiu66I3UwqSsMBlsQ:Lpe+ewDKMfTinqncsWp+A
TLSH
T1A5040752BD6EF261CB481339AD27BEB3C201258F3C5EDD86B665C5E39138C950C4B8E6
MD5 SHA1 SHA512 SSDEEP TLSH