Use cases - ESA Rules

[IshtiyaqShah]

Here in this space an attempt is being made to list some Use cases, custom as well as Out of box (Live) for their effectiveness and usage in Threat monitoring within an enterprise.

S.No	Use case	RSA OOB Rule	Description	Event Sources
1	DNS Amplification	esa000013	Detects when a UDP destination port is 53 and the total size of the network session packets is more than 4000 bytes. Both port and packet size are configurable.	Network Sessions Log Events
2	DNS Lookups From the Same Host	esa000048	Detects 50 DNS lookups in 60 seconds from the same IP source. Both the time window and the number of lookups are configurable.	Network Sessions Or  Log Events
3	Non DNS Traffic on UDP Port 53 containing Exécutable	esa000054	Detects non-DNS traffic over TCP or UDP destination port 53 containing an executable. You can configure the list of executable file extensions and ports for DNS traffic.	Network Sessions
4	Rogue DHCP Server Detected	esa000150	Detects traffic sourced on UDP 67/68 that is not a legitimate DHCP server, based on a whitelist of IP addresses that is configurable. Prerequisites for logs are: Meta-keyprotocol must be indexed in table-map.xml andindex-concentrator-custom.xml.	List configuration Network Sessions Log Events Threat Intelligence Feeds
5	Client Using Multiple DHCP Servers	esa000152	Detects a connection from a single IP address to 2 or more destination IP addresses on UDP 67 or UDP 68, within 10 minutes. The time period is configurable. Prerequisites for logs are: Meta-key 'protocol' must be indexed in table-map.xml and index-concentrator-custom.xml.	Network Sessions Log Events Threat Intelligence Feeds
6	Direct Login by a Guest Account	esa000002	Detects a successful interactive logon or a successful remote interactive logon to a guest account on a Microsoft Windows host.	Active Directory Log Events User Activity logs

7	Direct Login to an Administrative Account	esa000028	Detects a successful interactive logon or a successful remote interactive logon to an administrative account on a Microsoft Windows host.	Active Directory Log Events Whitelist Data Enrichment feeds
8	NTDSXTRACT Tool Download	esa000142	Detects an internal network session download of NTDSXTRACT, a tool framework for extracting data from the active directory database file NTDS.DIT. At least one network parser that supports the meta keys 'action' and 'filename' is required. Parsers include HTTP, FTP, IRC and NFS.	Network Sessions Active Directory Logs Out of box Parsers Threat Intelligence Feed
9	WebSploit Tool Download	esa000108	Detects WebSploit tool download from sourceforge.net. You must enable an HTTP parser and its dependencies onto the Decoder. HTTP_lua is recommended.	Network Sessions Out of box Parsers Threat Intelligence Feed
10	Aggressive Internal Web Portal Scan	esa000102	Detects a single host making connection attempts to 100 or more unique IP addresses in 1 minute over any combination of TCP/80 and TCP/443. Source & Destination IPs must be internal addresses according to the RFC-1918 specification. The list of ports, time window, and target host count are configurable.	Network Sessions Log Events Threat Intelligence Feeds

11	BYOD Mobile Web Agent Detected	esa000117	Detects a web-browsing agent for a mobile device. To configure the rule, specify the list of unauthorized browser agents and remove any mobile agents that are authorized from the list. The rule is triggered when an employee uses an unauthorized device on the network. "In addition to the list of unauthorized browser agents, the following parameters are also configurable: The number of connections allowed per source before the alert is triggered. Default is 1. The time window within which the unauthorized use takes place. The default is 600 seconds. "	Web proxy/Server Log Events Whitelist User Agents Enable extended web logs on Web server Data Enrichment feeds Network Session Event Log data
12	Aggressive Internal Database Scan	esa000104	Detects a single host making connection attempts to 100 or more unique IP addresses within 1 minute over any combination of the following ports: TCP/1433 UDP/1434 TCP/3306 TCP/5432 TCP/3351 TCP/1521 Source & Destination IP addresses must be internal addresses according to the RFC-1918 specification. The time window, list of port numbers and target host count are configurable.	Network Sessions DN Audit Logs Out of box Parsers Threat Intelligence Feed list Known DB servers

13	Insider Threat Mass Audit Clearing	esa000116​	Detects when the same user logs on multiple times to multiple Windows machines, then clears the audit log on each machine within a configurable time frame.	Web proxy/Server Log Events Whitelist User Agents Enable extended web logs on Web server Data Enrichment feeds Network Session Event Log data
14	Internal Data Posting to 3rd party sites	esa000089	Detects when: an internal IP address A receives an amount of data greater than 5 MB from internal IP address B, and then, within the specified time interval, IP A posts data to external 3rd party sites.	Network Flow Network Session User activity Logs FTP parsers Threat intelligence White and black list approved FTP domains
15	Low Orbit on Cannon DoS Tool Download	esa000107	Detects Low Orbit Ion Cannon DoS tool download from sourceforge.net. You must enable an HTTP parser and its dependencies onto the Decoder. HTTP_lua is recommended.	Network Session Event Logs
16	Stealth Email Use with Large Session	esa000128	Detects a session larger than 1 MB to the following stealth mail services: Stealth Email - https://stealth-email.com/ Hush Mail - https://www.hushmail.com/ Neomailbox - https://www.neomailbox.com Cryptoheaven - https://www.cryptoheaven.com S-mail - https://mail.s-mail.com/ The minimum session size, number of connections, and time window are configurable.	Network Sessions Mail Server Audit Logs Out of box Parsers Threat Intelligence Feed List approved mail server domains