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SEKOIA_Exploit_Linux_Eop_Dirtyc0W_Strings

Detects DirtyCow exploit

ExploitSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2023-12-08
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects DirtyCow exploit

Targets: Linux ELF.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
exploit-linux-eop-dirtyc0w-strings.yarDetection Rule License 1.1
rule SEKOIA_Exploit_Linux_Eop_Dirtyc0W_Strings : FILE
{
	meta:
		description = "Detects DirtyCow exploit"
		author = "Sekoia.io"
		id = "f0551e56-b08f-4f6f-81df-f30fbb8ee7b8"
		date = "2023-12-08"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/exploit_linux_eop_dirtyc0w_strings.yar#L1-L17"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "70f0dda642e7892e35c1afabb4fa6a9fe62ad82d5aa2d90787e83809bc6f5859"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "DirtyCow root privilege escalation"
		$ = "Backing up %s to /tmp/bak"
		$ = "(o o)_____/"

	condition:
		uint32be( 0 ) == 0x7f454c46 and filesize < 1MB and all of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$text"DirtyCow root privilege escalation"
$text"Backing up %s to /tmp/bak"
$text"(o o)_____/"

Condition

uint32be( 0 ) == 0x7f454c46 and filesize < 1MB and all of them

In plain words (Heuristic)

  • The file must start with the ELF header — a Linux/Unix executable.
  • The file must be smaller than 1MB (a cheap guard that skips large files).
  • All patterns in the rule must match.

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References

Licence & attribution

Author: Sekoia.io

Source repository: SEKOIA.IO Community @ a438a5901a

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: f0551e56-b08f-4f6f-81df-f30fbb8ee7b8

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE

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