Skip to content
yararules.org
Menu

YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_LOG_Proxynotshell_POC_CVE_2022_41040_Nov22

Detects logs generated after a successful exploitation using the PoC code against CVE-2022-41040 and CVE-2022-41082 (aka ProxyNotShell) in Microsoft Exchange servers

ExploitSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth (Nextron Systems)
Date
2022-11-17
Modified
2023-12-05
Score / Quality
70 / 85

What this rule detects

Detects logs generated after a successful exploitation using the PoC code against CVE-2022-41040 and CVE-2022-41082 (aka ProxyNotShell) in Microsoft Exchange servers

It defines 5 patterns (5 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
log-proxynotshell-poc-cve-2022-41040-nov22.yarDetection Rule License 1.1
rule SIGNATURE_BASE_LOG_Proxynotshell_POC_CVE_2022_41040_Nov22 : CVE_2022_41040 CVE_2022_41082
{
	meta:
		description = "Detects logs generated after a successful exploitation using the PoC code against CVE-2022-41040 and CVE-2022-41082 (aka ProxyNotShell) in Microsoft Exchange servers"
		author = "Florian Roth (Nextron Systems)"
		id = "1e47d124-3103-5bf5-946f-b1bb69ff2c8e"
		date = "2022-11-17"
		modified = "2023-12-05"
		reference = "https://github.com/testanull/ProxyNotShell-PoC"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/vuln_proxynotshell_cve_2022_41040.yar#L2-L20"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "7f91502fd9c59180970fc4253134582b44ba318db03ef4eb575257b2f3818d94"
		score = 70
		quality = 85
		tags = "CVE-2022-41040, CVE-2022-41082"

	strings:
		$aa1 = " POST " ascii wide
		$aa2 = " GET " ascii wide
		$ab1 = " 200 " ascii wide
		$s01 = "/autodiscover.json x=a" ascii wide
		$s02 = "/autodiscover/admin@localhost/" ascii wide

	condition:
		1 of ( $aa* ) and $ab1 and 1 of ( $s* )
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$aa1text" POST "ascii wide
$aa2text" GET "ascii wide
$ab1text" 200 "ascii wide
$s01text"/autodiscover.json x=a"ascii wide
$s02text"/autodiscover/admin@localhost/"ascii wide

Condition

1 of ( $aa* ) and $ab1 and 1 of ( $s* )

In plain words (Heuristic)

  • At least 1 patterns in ( $aa* ) must match.
  • At least 1 patterns in ( $s* ) must match.
  • Pattern $ab1 must be present.

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

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: 1e47d124-3103-5bf5-946f-b1bb69ff2c8e

Tags:CVE_2022_41040CVE_2022_41082

Related rules