[[ fm.text ]] Click here

Suspicious_Size_taskhost_exe

YARA detection rule by Florian Roth (Nextron Systems) · Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE

Detects uncommon file size of taskhost.exe

rule Suspicious_Size_taskhost_exe {
   meta:
      description = "Detects uncommon file size of taskhost.exe"
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      author = "Florian Roth (Nextron Systems)"
      score = 60
      date = "2015-12-23"
      modified = "2024-06-10"
      noarchivescan = 1
      id = "71b6c853-f490-5d5a-b481-909f6f3a8798"
   condition:
      uint16(0) == 0x5a4d
      and filename == "taskhost.exe"
      and not filepath contains "/lib/wine/fakedlls"
      and (filesize < 45KB or filesize > 200KB)
}

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

3e615560-85b3-4804-849b-748a0fc1cbfb

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