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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_SUSP_Msdt_Artefact_Jun22_2

Detects suspicious pattern in msdt diagnostics log (e.g. CVE-2022-30190 / Follina exploitation)

Suspicious / huntingSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Christian Burkard
Date
2022-06-01
Modified
2022-07-29
Score / Quality
75 / 85

What this rule detects

Detects suspicious pattern in msdt diagnostics log (e.g. CVE-2022-30190 / Follina exploitation)

It defines 4 patterns (4 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
susp-msdt-artefact-jun22-2.yarDetection Rule License 1.1
rule SIGNATURE_BASE_SUSP_Msdt_Artefact_Jun22_2 : CVE_2022_30190 FILE
{
	meta:
		description = "Detects suspicious pattern in msdt diagnostics log (e.g. CVE-2022-30190 / Follina exploitation)"
		author = "Christian Burkard"
		id = "aa2a4bd7-2094-5652-a088-f58d0c7d3f62"
		date = "2022-06-01"
		modified = "2022-07-29"
		reference = "https://twitter.com/nas_bench/status/1531718490494844928"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/gen_doc_follina.yar#L223-L242"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "e18f6405f0411128335336e65dda4ed2b6be6e9ad47b94646ececf0479fbe967"
		score = 75
		quality = 85
		tags = "CVE-2022-30190, FILE"

	strings:
		$a1 = "<ScriptError><Data id=\"ScriptName\" name=\"Script\">TS_ProgramCompatibilityWizard.ps1" ascii
		$x1 = "/../../" ascii
		$x2 = "$(Invoke-Expression" ascii
		$x3 = "$(IEX(" ascii nocase

	condition:
		uint32( 0 ) == 0x6D783F3C and $a1 and 1 of ( $x* )
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$a1text"<ScriptError><Data id=\"ScriptName\" name=\"Script\">TS_ProgramCompatibilityWizard.ps1"ascii
$x1text"/../../"ascii
$x2text"$(Invoke-Expression"ascii
$x3text"$(IEX("ascii nocase

Condition

uint32( 0 ) == 0x6D783F3C and $a1 and 1 of ( $x* )

In plain words (Heuristic)

  • At least 1 patterns in ( $x* ) must match.
  • Pattern $a1 must be present.

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References

Licence & attribution

Author: Christian Burkard

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

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

Rule id: aa2a4bd7-2094-5652-a088-f58d0c7d3f62

Tags:CVE_2022_30190FILE

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