SUSP_ScreenConnect_New_User_2024_Feb24

YARA detection rule by Florian Roth · NOASSERTION

Detects suspicious new ScreenConnect user created in 2024, which could be a sign of exploitation of the ConnectWise ScreenConnect (versions prior to 23.9.8) vulnerability that allows an Authentication Bypass

rule SUSP_ScreenConnect_New_User_2024_Feb24 {
   meta:
      description = "Detects suspicious new ScreenConnect user created in 2024, which could be a sign of exploitation of the ConnectWise ScreenConnect (versions prior to 23.9.8) vulnerability that allows an Authentication Bypass"
      author = "Florian Roth"
      reference = "https://twitter.com/_johnhammond/status/1760357971127832637"
      date = "2024-02-22"
      score = 50
      id = "f6675ded-39a4-590a-a201-fcfe3c056e60"
   strings:
      $a1 = "<Users xmlns:xsi="

      $s1 = "<CreationDate>2024-"
   condition:
      filesize < 200KB
      and all of them
      and filepath contains "\\ScreenConnect\\App_Data\\"
}

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

1d550d3f-1dbd-4381-8705-60d06043b187

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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

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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.

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

[[ currentRule.title ]]

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