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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_HAFNIUM_Forensic_Artefacts_Mar21_1

Detects forensic artefacts found in HAFNIUM intrusions

APT / threat actorSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth (Nextron Systems)
Date
2021-03-02
Modified
2023-12-05
Score / Quality
75 / 85

What this rule detects

Detects forensic artefacts found in HAFNIUM intrusions

It defines 3 patterns (3 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-hafnium-forensic-artefacts-mar21-1.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_HAFNIUM_Forensic_Artefacts_Mar21_1
{
	meta:
		description = "Detects forensic artefacts found in HAFNIUM intrusions"
		author = "Florian Roth (Nextron Systems)"
		id = "872822b0-34d9-5ae4-a532-6a8786494fa9"
		date = "2021-03-02"
		modified = "2023-12-05"
		reference = "https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_hafnium.yar#L35-L48"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "eb86595956092506c2e29373faaf39a3987f9feed36a53b191bedd498db05cbb"
		score = 75
		quality = 85
		tags = ""

	strings:
		$s1 = "lsass.exe C:\\windows\\temp\\lsass" ascii wide fullword
		$s2 = "c:\\ProgramData\\it.zip" ascii wide fullword
		$s3 = "powercat.ps1'); powercat -c" ascii wide fullword

	condition:
		1 of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$s1text"lsass.exe C:\\windows\\temp\\lsass"ascii wide fullword
$s2text"c:\\ProgramData\\it.zip"ascii wide fullword
$s3text"powercat.ps1'); powercat -c"ascii wide fullword

Condition

1 of them

In plain words (Heuristic)

  • At least 1 patterns in the rule must match.

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References

Licence & attribution

Author: Florian Roth (Nextron Systems)

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: 872822b0-34d9-5ae4-a532-6a8786494fa9

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