apt_tortoiseshell_imaploader

YARA detection rule by Sekoia.io · GPL-2.0

Detects IMAPLoader malware

rule apt_tortoiseshell_imaploader {
  meta:
    id             = "e1706b59-5c94-4fbf-8560-0022ca631d1d"
    version        = "1.0"
    description    = "Detects IMAPLoader malware"
    author         = "Sekoia.io"
    creation_date  = "2023-11-13"
    classification = "TLP:CLEAR"

  strings:
    $s1 = "yandex.com"
    $s2 = "saveImapMessage.pdb"
    $s3 = "downloader"
    $s4 = "MailServer.Auth"

  condition:
    filesize < 1MB and
    3 of them
}

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

2a530937-c748-48fd-98ef-0c0b06710475

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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

[[ 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 ]]

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