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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_MAL_HP_Ilo_Firmware_Dec21_1

Detects suspicios ELF files with sections as described in malicious iLO Board analysis by AmnPardaz in December 2021

APT / threat actorSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth (Nextron Systems)
Date
2021-12-28
Modified
2023-12-05
Score / Quality
80 / 85

What this rule detects

Detects suspicios ELF files with sections as described in malicious iLO Board analysis by AmnPardaz in December 2021

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-mal-hp-ilo-firmware-dec21-1.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_MAL_HP_Ilo_Firmware_Dec21_1 : FILE
{
	meta:
		description = "Detects suspicios ELF files with sections as described in malicious iLO Board analysis by AmnPardaz in December 2021"
		author = "Florian Roth (Nextron Systems)"
		id = "7f5fa905-07a3-55da-b644-c5ab882b4a9d"
		date = "2021-12-28"
		modified = "2023-12-05"
		reference = "https://threats.amnpardaz.com/en/2021/12/28/implant-arm-ilobleed-a/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_mal_ilo_board_elf.yar#L2-L18"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "7e959d07d864a485b8cc7765f9e12869ff34747ab552e26244eb28f510d1051f"
		score = 80
		quality = 85
		tags = "FILE"

	strings:
		$s1 = ".newelf.elf.text" ascii
		$s2 = ".newelf.elf.libc.so.data" ascii
		$s3 = ".newelf.elf.Initial.stack" ascii
		$s4 = ".newelf.elf.libevlog.so.data" ascii

	condition:
		filesize < 5MB and 2 of them or all of them
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$s1text".newelf.elf.text"ascii
$s2text".newelf.elf.libc.so.data"ascii
$s3text".newelf.elf.Initial.stack"ascii
$s4text".newelf.elf.libevlog.so.data"ascii

Condition

filesize < 5MB and 2 of them or all of them

In plain words (Heuristic)

  • The file must be smaller than 5MB (a cheap guard that skips large files).
  • All patterns in the rule must match.
  • At least 2 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: 7f5fa905-07a3-55da-b644-c5ab882b4a9d

Tags:FILE

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