cosmu | cab9d5af9234a0c00a062eeade678cb7342593c285e00eefc2c5924895ef94e7

Analysis

max time kernel
150s
max time network
126s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260710-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260710-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
26/08/2026, 03:58

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General

Target
2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
Size 569KB
Sample260826-ejznraywbx
SHA256 cab9d5af9234a0c00a062eeade678cb7342593c285e00eefc2c5924895ef94e7
MD5 ea4cbcf3f229951df06f9a523141a83c
SHA1 ff1a56e36bb11ad867ee2f9849de86a624866515
SHA512 866a549da143623a493ebe79ee2be1f06dc01c89ae87adc94aa82fe0645bfc1246c27bb6591a99ceeeb0875ded686f0758807a10d9a33713bded673e5b5a42f2
SSDEEP 6144:0HxJMZiJVLLgvfuhSHidvBOyDV0r6o8GjluhgFDvWdi:GPyOVLLpLdvB9Dan8JgFv
TLSH
T144C46EB0485F7EC4C3F0AAF595033AE25D0423BBBD757AD9E1D461BC2B28A950C663B1
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/1416-0-0x0000000000400000-0x000000000040A000-memory.dmp	family_cosmu
behavioral2/files/0x000a000000019cb5-2.dat	family_cosmu
behavioral2/files/0x000300000001b1af-6.dat	family_cosmu
behavioral2/memory/1416-405-0x0000000000400000-0x000000000040A000-memory.dmp	family_cosmu

Detects executables packed with eXPressor 4 IoCs

resource	yara_rule
behavioral2/memory/1416-0-0x0000000000400000-0x000000000040A000-memory.dmp	INDICATOR_EXE_Packed_eXPressor
behavioral2/files/0x000a000000019cb5-2.dat	INDICATOR_EXE_Packed_eXPressor
behavioral2/files/0x000300000001b1af-6.dat	INDICATOR_EXE_Packed_eXPressor
behavioral2/memory/1416-405-0x0000000000400000-0x000000000040A000-memory.dmp	INDICATOR_EXE_Packed_eXPressor

Renames multiple (2402) 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\7-Zip\Lang\ps.txt.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.ComponentModel.Annotations.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Security.Cryptography.X509Certificates.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\tr\ReachFramework.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\pl\UIAutomationClient.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Common Files\System\msadc\ja-JP\msaddsr.dll.mui.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Collections.Specialized.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Google\Chrome\Application\140.0.7339.81\Locales\bg.pak.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\legal\jdk\cryptix.md.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\en.ttt.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Common Files\System\msadc\es-ES\msdaprsr.dll.mui.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\CompareLimit.txt.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Runtime.Intrinsics.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\pl\PresentationCore.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\pl\System.Windows.Forms.Design.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\ro-RO\tipresx.dll.mui.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Net.WebProxy.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Runtime.CompilerServices.VisualC.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Configuration.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.Text.Encodings.Web.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\de\System.Windows.Forms.Design.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Google\Chrome\Application\140.0.7339.81\Locales\pl.pak.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\bin\api-ms-win-crt-filesystem-l1-1-0.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Collections.Immutable.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\pl\System.Windows.Input.Manipulations.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Java\jre-1.8\bin\fxplugins.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\de-DE\TipTsf.dll.mui.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Reflection.TypeExtensions.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Collections.NonGeneric.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Threading.Tasks.Dataflow.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\cs\PresentationCore.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Google\Chrome\Application\140.0.7339.81\Locales\id.pak.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Runtime.InteropServices.RuntimeInformation.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\pl\System.Windows.Forms.Primitives.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\System.Diagnostics.EventLog.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\legal\jdk\mesa3d.md.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Uninstall.exe.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\ja-JP\rtscom.dll.mui.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Diagnostics.DiagnosticSource.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\zh-Hant\ReachFramework.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\bin\kinit.exe.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\ku-ckb.txt.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-crt-runtime-l1-1-0.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\hr-HR\tipresx.dll.mui.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Common Files\System\uk-UA\wab32res.dll.mui.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Globalization.Extensions.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\fr\System.Windows.Forms.Primitives.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\ko\PresentationCore.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\zh-Hant\UIAutomationTypes.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\7-Zip\Lang\eo.txt.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\fr-FR\InkObj.dll.mui.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\System.Resources.Extensions.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\fr\ReachFramework.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\ja\System.Xaml.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Google\Chrome\Application\140.0.7339.81\IwaKeyDistribution\iwa-key-distribution.pb.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Java\jre-1.8\bin\decora_sse.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RHeartbeatConfig.xml.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Security.SecureString.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.15\System.AppContext.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\cs\System.Windows.Forms.Design.resources.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.15\PresentationFramework-SystemDrawing.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Java\jdk-1.8\jre\legal\javafx\mesa3d.md.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\VC\msdia100.dll.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
File created	C:\Program Files\Common Files\microsoft shared\VSTO\vstoee100.tlb.tmp	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_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	2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe

C:\Users\Admin\AppData\Local\Temp\2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-25_ea4cbcf3f229951df06f9a523141a83c_elex_wannacry.exe"
1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:1416

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

Replay Monitor

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Downloads

desktop.ini.tmp

Path C:\$Recycle.Bin\S-1-5-21-2246396966-3025826688-3847171515-1000\desktop.ini.tmp
Size 569KB
SHA256 48ad78fa7a6fbf42c1fa3e73c2159a54af8cd2ebfd57b5de22f49532e736c480
MD5 ab796a0559dc376cbcd20369293655c6
SHA1 809c4c722218093a7e186c8a40a44c72101f06e8
SHA512 ecea3352db01cbe5047556253245ec98a03dee6d5a2bc431d7e69b40ea0aa0ae72de7d61ae34395501f14665ec5e7563ee1210b67aeaa78e7a0f80b48ed7f7ee
SSDEEP 6144:0HxJMZiJVLLgvfuhSHidvBOyDV0r6o8GjluhgFDvWd2:GPyOVLLpLdvB9Dan8JgFP
TLSH
T19DC46EB0485F7EC4C3F0AAF595033AE25D0423BBBD757AD9E1D461BC2B28A950C663B1
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

7-zip.dll.tmp

Path C:\Program Files\7-Zip\7-zip.dll.tmp
Size 668KB
SHA256 3fa20654421f8f4dd438bc79690b3f5987712bc64976bfd73c8062dfc9355dee
MD5 cab0b87088f455d16c78a04adc2e229f
SHA1 c526d33d2d05436eaa95e741df9f60a9947e47b1
SHA512 249c78197470681fe76ff6247906153038f966c22ded85653868f4d44182ae7980e907eba42e11e78ea3c69066a88544fbf676139b70b66320d259253fa6c2d8
SSDEEP 6144:0HxJMZiJVLLgvfuhSHidvBOyDV0r6o8GjluhgFDvWddMfTinqncsWp+j:GPyOVLLpLdvB9Dan8JgFEMfunbsW8j
TLSH
T18CE4C5B0485FBEC4C7F0AAF595033AE25D0423BBBC75BAD5E1D461BD2728A850C663B1
MD5 SHA1 SHA512 SSDEEP TLSH