Elastic Defend high stable eql
Egress Network Connection from Default DPKG Directory
This rule monitors for network connections from processes that are executed from the /var/lib/dpkg/info/ directory. This directory is used to store information about installed packages. Attackers can backdoor the installation scripts of packages to establish network connections during the installation process to maintain persistence or to establish command and control.
Detection Logic
sequence with maxspan=3s
[process where event.type == "start" and event.action == "exec" and
process.parent.executable like "/var/lib/dpkg/info/*" and not (
process.executable like ("/usr/sbin/runuser", "/opt/vivaldi/*", "/usr/bin/syslog-ng-update-virtualenv") or
process.parent.executable == "/var/lib/dpkg/info/falco.postinst" or
process.parent.executable like (
"/var/lib/dpkg/info/percona-server-server-*.postinst", "/var/lib/dpkg/info/vivaldi*",
"/var/lib/dpkg/info/percona-xtradb-cluster-server*", "/var/lib/dpkg/info/univention-updater*",
"/var/lib/dpkg/info/microsoft-edge-beta.postinst"
) or
process.parent.name in ("mdatp.postinst", "mdatp.postrm") or
process.args like ("/var/lib/dpkg/info/percona-xtradb-cluster-server-*.postinst", "/etc/cron.daily/*")
)
] by process.entity_id
[network where event.type == "start" and event.action == "connection_attempted" and not (
destination.ip == null or
destination.ip == "0.0.0.0" or
cidrmatch(
destination.ip, "10.0.0.0/8", "127.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", "192.0.0.0/24", "192.0.0.0/29",
"192.0.0.8/32", "192.0.0.9/32", "192.0.0.10/32", "192.0.0.170/32", "192.0.0.171/32", "192.0.2.0/24",
"192.31.196.0/24", "192.52.193.0/24", "192.168.0.0/16", "192.88.99.0/24", "224.0.0.0/4", "100.64.0.0/10",
"192.175.48.0/24","198.18.0.0/15", "198.51.100.0/24", "203.0.113.0/24", "240.0.0.0/4", "::1", "FE80::/10",
"FF00::/8", "172.31.0.0/16"
) or
process.executable in (
"/usr/bin/apt-get", "/bin/apt-get", "/opt/cisco/amp/etc/ampinsthelper", "/opt/teleport/system/bin/tsh",
"/usr/lib/apt/methods/https"
)
)] by process.parent.entity_id Field Validations
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