/*
CICADA3301 ransomware (Rust, ESXi)
*/

rule Cicada3301_Ransomnote
{
    meta:
        author = "ransomware.live"
        family = "ransomware.cicada3301"
        description = "Detects CICADA3301 ransomware ransom note"
        date = "2026-05-04"
        severity = 7
        score = 70

    strings:
        $s1 = "CICADA3301" ascii nocase
        $s2 = "RECOVER-" ascii
        $s3 = "cicada3301" ascii nocase
        $s4 = "cicada.onion" ascii nocase

    condition:
        any of them
}

rule Cicada3301_PE
{
    meta:
        author = "ransomware.live"
        family = "ransomware.cicada3301"
        description = "Detects CICADA3301 ransomware binary"
        date = "2026-05-04"
        severity = 9
        score = 90

    strings:
        $s1 = "CICADA3301" ascii wide
        $s2 = "esxi" ascii nocase
        $s3 = "vim-cmd" ascii

    condition:
        (uint16(0) == 0x5A4D or uint32(0) == 0x464C457F) and 2 of them
}