SigmaHQ/rules/windows/sysmon/sysmon_malware_backconnect_ports.yml

title: Suspicious Typical Malware Back Connect Ports
status: experimental
description: Detects programs that connect to typical malware back connect ports based on statistical analysis from two different sandbox system databases
references:
    - https://docs.google.com/spreadsheets/d/17pSTDNpa0sf6pHeRhusvWG6rThciE8CsXTSlDUAZDyo
author: Florian Roth
date: 2017/03/19
tags:
    - attack.command_and_control
    - attack.t1043
logsource:
    product: windows
    service: sysmon
    definition: 'Use the following config to generate the necessary Event ID 10 Process Access events: <ProcessAccess onmatch="include"><CallTrace condition="contains">VBE7.DLL</CallTrace></ProcessAccess><ProcessAccess onmatch="exclude"><CallTrace condition="excludes">UNKNOWN</CallTrace></ProcessAccess>'
detection:
    selection:
        EventID: 3
        DestinationPort:
            - '4443'
            - '2448'
            - '8143'
            - '1777'
            - '1443'
            - '243'
            - '65535'
            - '13506'
            - '3360'
            - '200'
            - '198'
            - '49180'
            - '13507'
            - '6625'
            - '4444'
            - '4438'
            - '1904'
            - '13505'
            - '13504'
            - '12102'
            - '9631'
            - '5445'
            - '2443'
            - '777'
            - '13394'
            - '13145'
            - '12103'
            - '5552'
            - '3939'
            - '3675'
            - '666'
            - '473'
            - '5649'
            - '4455'
            - '4433'
            - '1817'
            - '100'
            - '65520'
            - '1960'
            - '1515'
            - '743'
            - '700'
            - '14154'
            - '14103'
            - '14102'
            - '12322'
            - '10101'
            - '7210'
            - '4040'
            - '9943'
    filter1:
        Image: '*\Program Files*'
    filter2:
        DestinationIp: 
            - '10.*'
            - '192.168.*'
            - '172.16.*'
            - '172.17.*'
            - '172.18.*'
            - '172.19.*'
            - '172.20.*'
            - '172.21.*'
            - '172.22.*'
            - '172.23.*'
            - '172.24.*'
            - '172.25.*'
            - '172.26.*'
            - '172.27.*'
            - '172.28.*'
            - '172.29.*'
            - '172.30.*'
            - '172.31.*'
            - '127.*'
        DestinationIsIpv6: 'false'
    condition: selection and not ( filter1 or filter2 )
falsepositives:
    - unknown
level: medium