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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_LOG_F5_BIGIP_Exploitation_Artefacts_CVE_2021_22986_Mar21_1

Detects forensic artefacts indicating successful exploitation of F5 BIG IP appliances as reported by NCCGroup

ExploitSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth (Nextron Systems)
Date
2021-03-20
Modified
2023-12-05
Score / Quality
80 / 85

What this rule detects

Detects forensic artefacts indicating successful exploitation of F5 BIG IP appliances as reported by NCCGroup

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
log-f5-bigip-exploitation-artefacts-cve-2021-22986-mar21-1.yarDetection Rule License 1.1
rule SIGNATURE_BASE_LOG_F5_BIGIP_Exploitation_Artefacts_CVE_2021_22986_Mar21_1 : LOG
{
	meta:
		description = "Detects forensic artefacts indicating successful exploitation of F5 BIG IP appliances as reported by NCCGroup"
		author = "Florian Roth (Nextron Systems)"
		id = "e109ebeb-e5c3-5999-95dc-0963ed8461a6"
		date = "2021-03-20"
		modified = "2023-12-05"
		reference = "https://research.nccgroup.com/2021/03/18/rift-detection-capabilities-for-recent-f5-big-ip-big-iq-icontrol-rest-api-vulnerabilities-cve-2021-22986/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/exploit_f5_bigip_cve_2021_22986_log.yar#L2-L15"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "748bb429d4a086e2890773558ea502ef06f507aed5f0f70470e2cd97a3fd5007"
		score = 80
		quality = 85
		tags = "LOG"

	strings:
		$x1 = "\",\"method\":\"POST\",\"uri\":\"http://localhost:8100/mgmt/tm/util/bash\",\"status\":200," ascii
		$x2 = "[com.f5.rest.app.RestServerServlet] X-F5-Auth-Token doesn't have value, so skipping" ascii

	condition:
		1 of them
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$x1text"\",\"method\":\"POST\",\"uri\":\"http://localhost:8100/mgmt/tm/util/bash\",\"status\":200,"ascii
$x2text"[com.f5.rest.app.RestServerServlet] X-F5-Auth-Token doesn't have value, so skipping"ascii

Condition

1 of them

In plain words (Heuristic)

  • At least 1 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: e109ebeb-e5c3-5999-95dc-0963ed8461a6

Tags:LOG

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