""ET TROJAN Suspicious Long NULL DNS Request - Possible DNS Tunneling""
SID: 2029995
Revision: 3
Class Type: trojan-activity
Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target DNS_Server, created_at 2020_04_22, deployment Perimeter, signature_severity Major, updated_at 2022_03_31
Reference:
Protocol: udp
Source Network: $HOME_NET
Source Port: any
Destination Network: any
Destination Port: 53
Flow:
Contents:
-
Value: "|01|" Depth: 1 Offset: 2
-
Value: "|00 01 00 00 00 00 00|"
-
Value: "|00 0a 00 01|"
-
Value: !"microsoft.com|03|"
Within: 7
PCRE:
Special Options:
- fast_pattern