VULN_KeePass_DB_Brute_Forcible

YARA detection rule by Arnim Rupp (https://github.com/ruppde) · NOASSERTION

Detects KeePass .kdbx password stores, which could be brute forced to steal the credentials. With AES-KDF and less than 65536 iterations the cracking speed with a single GPU is 20k/s, for the old default of 6.000 iterations it's 200k/s. Best remediation is to change the key derivative function to Argon2d and delete all older versions of the .kdbx

rule VULN_KeePass_DB_Brute_Forcible {
   meta:
      description = "Detects KeePass .kdbx password stores, which could be brute forced to steal the credentials. With AES-KDF and less than 65536 iterations the cracking speed with a single GPU is 20k/s, for the old default of 6.000 iterations it's 200k/s. Best remediation is to change the key derivative function to Argon2d and delete all older versions of the .kdbx"
      author = "Arnim Rupp (https://github.com/ruppde)"
      date = "2023-07-20"
      score = 60
      reference = "https://keepass.info/help/base/security.html#secdictprotect"
      id = "b1a86e03-b3d1-5abc-9287-a4846451caff"
   strings:
      $keepass_magic = { 03 D9 A2 9A 67 FB 4B B5 }
            $below_65536_rounds = { 06 08 00 ?? ?? 00 00 00 00 00 00 07 10 00 }
   condition:
      $keepass_magic at 0 and
      $below_65536_rounds at 108
}

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

18e3ac03-f8c4-493a-9929-81431f38dc1b

Propose edits, view related rules, and engage with the community through comments.

Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

What does this mean?

Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

Community Discussion