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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_LOG_EXPL_Moveit_Exploitation_Indicator_Jun23_2

Detects a potential compromise indicator found in MOVEit Transfer logs

ExploitSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth
Date
2023-06-03
Modified
2023-12-05
Score / Quality
70 / 85

What this rule detects

Detects a potential compromise indicator found in MOVEit Transfer logs

It defines 7 patterns (7 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
log-expl-moveit-exploitation-indicator-jun23-2.yarDetection Rule License 1.1
rule SIGNATURE_BASE_LOG_EXPL_Moveit_Exploitation_Indicator_Jun23_2
{
	meta:
		description = "Detects a potential compromise indicator found in MOVEit Transfer logs"
		author = "Florian Roth"
		id = "1527f5e3-071d-5152-9452-9c4472d258f2"
		date = "2023-06-03"
		modified = "2023-12-05"
		reference = "https://www.huntress.com/blog/moveit-transfer-critical-vulnerability-rapid-response"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/vuln_moveit_0day_jun23.yar#L58-L79"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "56328d078801a702ad47f01f356df6f00be8da593d03c549e77312af9b47b5be"
		score = 70
		quality = 85
		tags = ""

	strings:
		$a1 = "Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/105.0.5195.102+Safari/537.36" ascii
		$a2 = "Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/105.0.5195.54+Safari/537.36" ascii
		$s1 = " POST /moveitisapi/moveitisapi.dll" ascii
		$s2 = " POST /guestaccess.aspx"
		$s3 = " POST /api/v1/folders/"
		$s4 = "/files uploadType=resumable&"
		$s5 = " action=m2 "

	condition:
		1 of ( $a* ) and 3 of ( $s* ) or all of ( $s* )
}

Strings (7 patterns)

IdentifierTypeValueModifiers
$a1text"Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/105.0.5195.102+Safari/537.36"ascii
$a2text"Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/105.0.5195.54+Safari/537.36"ascii
$s1text" POST /moveitisapi/moveitisapi.dll"ascii
$s2text" POST /guestaccess.aspx"
$s3text" POST /api/v1/folders/"
$s4text"/files uploadType=resumable&"
$s5text" action=m2 "

Condition

1 of ( $a* ) and 3 of ( $s* ) or all of ( $s* )

In plain words (Heuristic)

  • All patterns in ( $s* ) must match.
  • At least 1 patterns in ( $a* ) must match.
  • At least 3 patterns in ( $s* ) must match.

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References

Licence & attribution

Author: Florian Roth

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: 1527f5e3-071d-5152-9452-9c4472d258f2

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