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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_SUSP_EXPL_Commvault_CVE_2025_57791_Aug25_2

Detects potential exploit for WT-2025-0050, authentication bypass through QCommand argument injection

Suspicious / huntingSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
X__Junior
Date
2025-08-21
Modified
2026-05-15
Score / Quality
65 / 85

What this rule detects

Detects potential exploit for WT-2025-0050, authentication bypass through QCommand argument injection

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

Summary generated from the rule's metadata and condition.

Rule source

susp-expl-commvault-cve-2025-57791-aug25-2.yarDetection Rule License 1.1
rule SIGNATURE_BASE_SUSP_EXPL_Commvault_CVE_2025_57791_Aug25_2 : FILE
{
	meta:
		description = "Detects potential exploit for WT-2025-0050, authentication bypass through QCommand argument injection"
		author = "X__Junior"
		id = "4a581a0d-bd1d-599d-a1b9-936dbcda75a8"
		date = "2025-08-21"
		modified = "2026-05-15"
		reference = "https://labs.watchtowr.com/guess-who-would-be-stupid-enough-to-rob-the-same-vault-twice-pre-auth-rce-chains-in-commvault/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/expl_commvault_cve_2025_57791.yar#L17-L30"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "61e3ddc09157badb2a1abf30da2cc35cac1a723db1134a37cb667be78209b845"
		score = 65
		quality = 85
		tags = "FILE"

	strings:
		$sa1 = "_localadmin__"
		$sa2 = "-localadmin" base64

	condition:
		filesize < 20MB and all of them
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$sa1text"_localadmin__"
$sa2text"-localadmin"base64

Condition

filesize < 20MB and all of them

In plain words (Heuristic)

  • The file must be smaller than 20MB (a cheap guard that skips large files).
  • All patterns in the rule must match.

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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

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References

Licence & attribution

Author: X__Junior

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: 4a581a0d-bd1d-599d-a1b9-936dbcda75a8

Tags:FILE