Skip to content
yararules.org
Menu

YARA · Costin Raiu yararules

CRAIU_Crashstrike

Crowdstrike C-00000???-*.sys files

GenericCostin Raiu yararulesGNU General Public License v3.0Compiles with YARA-X
Author
Costin G. Raiu, Art of Noh, craiu@noh.ro
Date
2024-07-19
Score / Quality
75 / 85

What this rule detects

Crowdstrike C-00000???-*.sys files

It defines 2 patterns (2 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
crashstrike.yarGNU General Public License v3.0
rule CRAIU_Crashstrike : FILE
{
	meta:
		description = "Crowdstrike C-00000???-*.sys files"
		author = "Costin G. Raiu, Art of Noh, craiu@noh.ro"
		id = "9a5168c4-0a7f-5269-bafa-728f123a04c5"
		date = "2024-07-19"
		modified = "2024-07-19"
		reference = "https://en.wikipedia.org/wiki/July_2024_global_cyber_outages"
		source_url = "https://github.com/craiu/yararules/blob/23cf0ca22021fa3684e180a18416b9ae1b695243/files/20240719_crashstrike.yara#L2-L26"
		license_url = "https://github.com/craiu/yararules/blob/23cf0ca22021fa3684e180a18416b9ae1b695243/LICENSE"
		hash = "9d001ef3206fe2f955095244e6103ad7f8f318c7c5cbd91a0dd1f33e4217fcb2"
		logic_hash = "9a8dacf9d95042851073c40f5eab2a6aff61be3a576363ffcd8c21aaec7f0b96"
		score = 75
		quality = 85
		tags = "FILE"
		version = "1.0"

	strings:
		$a1 = "000E0A000E0GHijklMNOPqRSTUVwX"
		$a2 = "AbCDEfghIjklMNoPqrstuV"

	condition:
		( filesize < 60KB ) and ( uint32( 0 ) == 0xaaaaaaaa ) and ( all of them )
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$a1text"000E0A000E0GHijklMNOPqRSTUVwX"
$a2text"AbCDEfghIjklMNoPqrstuV"

Condition

( filesize < 60KB ) and ( uint32( 0 ) == 0xaaaaaaaa ) and ( all of them )

In plain words (Heuristic)

  • The file must be smaller than 60KB (a cheap guard that skips large files).
  • All patterns in the rule must match.

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

Open in editor

References

Sample hashes

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

  • 9d001ef3206fe2f955095244e6103ad7f8f318c7c5cbd91a0dd1f33e4217fcb2

Licence & attribution

Author: Costin G. Raiu, Art of Noh, craiu@noh.ro

Source repository: Costin Raiu yararules @ 23cf0ca220

Licence: GNU General Public License v3.0 (repository licence)

Original rule

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

Rule id: 9a5168c4-0a7f-5269-bafa-728f123a04c5

Metadata

version1.0

Tags:FILE

Related rules