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EMBEERESEARCH_Win_Lumma_Simple_Strings

MalwareLummaEmbee ResearchDetection Rule License 1.1Compiles with YARA-X
Author
Matthew @ Embee_Research
Date
2023-09-13
Modified
2023-09-21
Score / Quality
75 / 75

What this rule detects

Associated malware family: Lumma.

Targets: Windows PE.

It defines 7 patterns (4 text, 3 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
win-lumma-simple-strings.yarDetection Rule License 1.1
rule EMBEERESEARCH_Win_Lumma_Simple_Strings : FILE
{
	meta:
		description = ""
		author = "Matthew @ Embee_Research"
		id = "d949d547-a2ee-56d9-8510-74f3b718b2c0"
		date = "2023-09-13"
		modified = "2023-09-21"
		reference = "https://github.com/embee-research/Yara-detection-rules/"
		source_url = "https://github.com/embee-research/Yara-detection-rules//blob/ac56d6f6fd2a30c8cb6e5c0455d6519210a8b0f4/Rules/win_lumma _simple_sep_2023.yar#L1-L40"
		license_url = "N/A"
		hash = "277d7f450268aeb4e7fe942f70a9df63aa429d703e9400370f0621a438e918bf"
		logic_hash = "0b3cb6721d26b79afe892b1c4df5e54c18cd7a5492aeacd442deca6b9b926f3c"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "Binedx765ance Chaedx765in Waledx765let" wide
		$s2 = "%appdaedx765ta%\\Moedx765zilla\\Firedx765efox\\Profedx765iles"
		$s3 = "\\Locedx765al Extensedx765ion Settinedx765gs\\"
		$s4 = "%appdedx765ata%\\Opedx765era Softwedx765are\\Opedx765era GX Staedx765ble"
		$o1 = {57 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 65 00 62 00 20 00 44 00 61 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 74 00 61 00}
		$o2 = {4f 00 70 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 65 00 72 00 61 00 20 00 4e 00 65 00 6f 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 6e 00}
		$o3 = {4c 00 6f 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 67 00 69 00 6e 00 20 00 44 00 61 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 74 00 61 00}

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 5000KB and ( ( all of ( $s* ) ) or ( all of ( $o* ) ) )
}

Strings (7 patterns)

IdentifierTypeValueModifiers
$s1text"Binedx765ance Chaedx765in Waledx765let"wide
$s2text"%appdaedx765ta%\\Moedx765zilla\\Firedx765efox\\Profedx765iles"
$s3text"\\Locedx765al Extensedx765ion Settinedx765gs\\"
$s4text"%appdedx765ata%\\Opedx765era Softwedx765are\\Opedx765era GX Staedx765ble"
$o1hex{57 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 65 00 62 00 20 00 44 00 61 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 74 00 61 00}
$o2hex{4f 00 70 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 65 00 72 00 61 00 20 00 4e 00 65 00 6f 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 6e 00}
$o3hex{4c 00 6f 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 67 00 69 00 6e 00 20 00 44 00 61 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 74 00 61 00}

Condition

uint16( 0 ) == 0x5a4d and filesize < 5000KB and ( ( all of ( $s* ) ) or ( all of ( $o* ) ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 5000KB (a cheap guard that skips large files).
  • All patterns in ( $s* ) must match.
  • All patterns in ( $o* ) must match.

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References

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

  • 277d7f450268aeb4e7fe942f70a9df63aa429d703e9400370f0621a438e918bf

Licence & attribution

Author: Matthew @ Embee_Research

Source repository: Embee Research @ ac56d6f6fd

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: d949d547-a2ee-56d9-8510-74f3b718b2c0

Tags:FILE

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