""ET TROJAN ELF/Emptiness v1.1 DNS Flood Command Inbound""
SID: 2027841
Revision: 1
Class Type: trojan-activity
Metadata: affected_product Linux, created_at 2019_08_09, malware_family Emptiness, tag DDoS, updated_at 2019_08_09
Reference:
Protocol: tcp
Source Network: $EXTERNAL_NET
Source Port: any
Destination Network: $HOME_NET
Destination Port: any
Flow: established,from_server
Contents:
- Value: "LmRucy" Depth: 6
Within:
PCRE: "/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/i"
Special Options:
- fast_pattern