General
- Target WindowsUpdateService.exe
- Size 2.9MB
- Sample260831-ybd7maac29
- SHA256 de0f63d516fb70b999c715a8e73ce443466e91ce9c24dddf44a98ba27f2e9441
- MD5 c2562bcefe7918927f15946b71caa3b8
- SHA1 fa0533a7242ed51f222ce0fd5defcc05f7bf210a
- SHA512 2c154aa3532553888fe1a299bc179a4d6d5875868626fce238bcb5fd6e9cbe833fb9b6992c7d07e778a78266b3f4b18f7847af4752a33728c8ea3e3ce78afc1c
- SSDEEP 49152:Qf3A6WLYrq3RxQZrrtu9RkkF4ib3ShL5bT+6qJ3L3XltFGwc9iWjdl+iJ0zjaajs:5YORfqq33oK9iD/22
- TLSH T190D53328ED6FEF79DF48CC724F746D9A085124C81B20597C79562082A1EF3E762CD8AD
- MD5 SHA1 SHA512 SSDEEP TLSH
Static task
static1
Behavioral task
behavioral1
Sample
WindowsUpdateService.exe
Resource
win11-20260513-en
Behavioral task
behavioral2
Sample
WindowsUpdateService.exe
Resource
win11ltsc2024-20260709-en
Malware Config
Targets
-
- Target WindowsUpdateService.exe
- Size 2.9MB
- SHA256 de0f63d516fb70b999c715a8e73ce443466e91ce9c24dddf44a98ba27f2e9441
- MD5 c2562bcefe7918927f15946b71caa3b8
- SHA1 fa0533a7242ed51f222ce0fd5defcc05f7bf210a
- SHA512 2c154aa3532553888fe1a299bc179a4d6d5875868626fce238bcb5fd6e9cbe833fb9b6992c7d07e778a78266b3f4b18f7847af4752a33728c8ea3e3ce78afc1c
- SSDEEP 49152:Qf3A6WLYrq3RxQZrrtu9RkkF4ib3ShL5bT+6qJ3L3XltFGwc9iWjdl+iJ0zjaajs:5YORfqq33oK9iD/22
- TLSH T190D53328ED6FEF79DF48CC724F746D9A085124C81B20597C79562082A1EF3E762CD8AD
- MD5 SHA1 SHA512 SSDEEP TLSH
-
Contains code to disable Windows Defender
A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.
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Modifies WinLogon for persistence
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Modifies Windows Defender notification settings
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Modifies security service
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UAC bypass
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Deletes shadow copies
Ransomware often targets backup files to inhibit system recovery.
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Modifies boot configuration data using bcdedit
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Blocks application from running via registry modification
Adds application to list of disallowed applications.
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Command and Scripting Interpreter: PowerShell
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
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Disables Task Manager via registry modification
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Disables one or more Microsoft Defender components
Uses the Powershell Set-MpPreference cmdlet to disable one or more Microsoft Defender components.
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Event Triggered Execution: Image File Execution Options Injection
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Possible privilege escalation attempt
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Uses Session Manager for persistence
Creates Session Manager registry key to run executable early in system boot.
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Disables automatic submission of suspicious files to Microsoft by Windows Defender
Uses the Powershell Set-MpPreference cmdlet to prevent Windows Defender from automatically sending files to Microsoft for analysis.
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Disables service(s)
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Executes dropped EXE
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Modifies file permissions
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Windows security modification
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Checks whether UAC is enabled
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Drops desktop.ini file(s)
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Drops file in System32 directory
MITRE ATT&CK Enterprise v16
Execution
Command and Scripting Interpreter
2PowerShell
1Windows Command Shell
1System Services
1Service Execution
1Windows Management Instrumentation
1Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Create or Modify System Process
4Windows Service
4Event Triggered Execution
1Image File Execution Options Injection
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Create or Modify System Process
4Windows Service
4Event Triggered Execution
1Image File Execution Options Injection
1Defense Evasion
Abuse Elevation Control Mechanism
1Bypass User Account Control
1File and Directory Permissions Modification
1Impair Defenses
7Disable or Modify Tools
6Indicator Removal
1File Deletion
1Modify Registry
9