APT_APT28_Win_FreshFire

YARA detection rule by threatintel@volexity.com · NOASSERTION

The FRESHFIRE malware family. The malware acts as a downloader, pulling down an encrypted snippet of code from a remote source, executing it, and deleting it from the remote server.

import "pe"
rule APT_APT28_Win_FreshFire : APT29 {
   meta:
      author = "threatintel@volexity.com"
      date = "2021-05-27"
      description = "The FRESHFIRE malware family. The malware acts as a downloader, pulling down an encrypted snippet of code from a remote source, executing it, and deleting it from the remote server."
      hash = "ad67aaa50fd60d02f1378b4155f69cffa9591eaeb80523489a2355512cc30e8c"
      reference = "https://www.volexity.com/blog/2021/05/27/suspected-apt29-operation-launches-election-fraud-themed-phishing-campaigns/"
      id = "050b8e61-139a-5ff5-998a-7de67c9975bf"
   strings:
      $uniq1 = "UlswcXJJWhtHIHrVqWJJ"
      $uniq2 = "gyibvmt\x00"

      $path1 = "root/time/%d/%s.json"
      $path2 = "C:\\dell.sdr"
      $path3 = "root/data/%d/%s.json"
   condition:
      (
         pe.number_of_exports == 1 and pe.exports("WaitPrompt")
      ) or
      any of ($uniq*) or
      2 of ($path*)
}

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

97d56d80-a03c-438b-9fc5-fb5e5680548b

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