Elastic Defend high stable eql

Potential Injection via NSIS Installer

Identifies allocation of RWX memory region from a Nullsoft scriptable installer. Adversaries may abuse NSIS installers to deliver malware for initial access.

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Detection Logic

sequence by process.entity_id with maxspan=1m
 [library where dll.path : "?:\\users\\*\\appdata\\local\\temp\\ns*.tmp\\system.dll" and not process.code_signature.status : "trusted"]
 [api where 
  process.Ext.api.name : ("VirtualAlloc*", "MapViewOfFile*") and process.Ext.api.parameters.protection : "RWX" and process.Ext.api.parameters.size >= 10000 and 
  process.thread.Ext.call_stack_summary : ("*kernelbase.dll
| system.dll*", "*kernelbase.dll
| Unknown*", "*kernelbase.dll
| Unbacked*")]

Field Validations

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