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DITEKSHEN_INDICATOR_TOOL_UAC_NSISUAC

Detects NSIS UAC plugin

Suspicious / huntingditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X
Author
ditekSHen
Date
2020-11-06
Modified
2024-09-25
Score / Quality
75 / 75

What this rule detects

Detects NSIS UAC plugin

Targets: Windows PE.

It defines 5 patterns (5 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
indicator-tool-uac-nsisuac.yarBSD 2-Clause License
rule DITEKSHEN_INDICATOR_TOOL_UAC_NSISUAC : FILE
{
	meta:
		description = "Detects NSIS UAC plugin"
		author = "ditekSHen"
		id = "4a7c20f6-bf0e-55fb-a0b9-7b51e4af7cd3"
		date = "2020-11-06"
		modified = "2024-09-25"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/indicator_tools.yar#L575-L587"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "48c0247c789328a0ff62816f5d6ecac7a0f2a3fe2cb95d99c0e7d988147f7137"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "HideCurrUserOpt" fullword wide
		$s2 = "/UAC:%X /NCRC%s" fullword wide
		$s3 = "2MyRunAsStrings" fullword wide
		$s4 = "CheckElevationEnabled" fullword ascii
		$s5 = "UAC.dll" fullword ascii

	condition:
		uint16( 0 ) == 0x5a4d and all of them
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$s1text"HideCurrUserOpt"fullword wide
$s2text"/UAC:%X /NCRC%s"fullword wide
$s3text"2MyRunAsStrings"fullword wide
$s4text"CheckElevationEnabled"fullword ascii
$s5text"UAC.dll"fullword ascii

Condition

uint16( 0 ) == 0x5a4d and all of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • All patterns in the rule must match.

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References

Licence & attribution

Author: ditekSHen

Source repository: ditekSHen detection @ e76c93dcde

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright 2021 by ditekSHen (https://github.com/ditekshen/detection).

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 4a7c20f6-bf0e-55fb-a0b9-7b51e4af7cd3

Tags:FILE

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