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SEKOIA_Exploit_Linux_Eop_Ubuntu_Overlayfs_Local_Privesc_Strings

Detects Ubuntu OverlayFS Local Privesc 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 Ubuntu OverlayFS Local Privesc exploit

Targets: Linux ELF.

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
exploit-linux-eop-ubuntu-overlayfs-local-privesc-strings.yarDetection Rule License 1.1
rule SEKOIA_Exploit_Linux_Eop_Ubuntu_Overlayfs_Local_Privesc_Strings : FILE
{
	meta:
		description = "Detects Ubuntu OverlayFS Local Privesc exploit"
		author = "Sekoia.io"
		id = "5e0e73f5-4cb3-4a79-adac-578b17ed7660"
		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_ubuntu_overlayfs_local_privesc_strings.yar#L1-L20"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "48ff9d2a10eef1e9b9088ba4a53aa77f43324e5d51da65b65a5829276067f011"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "./ovlcap"
		$ = "rm -rf '%s/'"
		$ = "./ovlcap/work"
		$ = "./ovlcap/lower"
		$ = "./ovlcap/upper"
		$ = "./ovlcap/merge"

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

Strings (6 patterns)

IdentifierTypeValueModifiers
$text"./ovlcap"
$text"rm -rf '%s/'"
$text"./ovlcap/work"
$text"./ovlcap/lower"
$text"./ovlcap/upper"
$text"./ovlcap/merge"

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: 5e0e73f5-4cb3-4a79-adac-578b17ed7660

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE

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