T1589.002 Email Addresses

Technique

T1589.002

Tactics

Reconnaissance

Research, 90 days

1

KEV CVEs mapped

0

SigmaHQ rules

1

Elastic, Splunk

1

thrunt rules

0

Upstream

https://attack.mitre.org/techniques/T1589/002

MITRE description

Adversaries may gather email addresses that can be used during targeting. Even if internal instances exist, organizations may have public-facing email infrastructure and addresses for employees. Adversaries may easily gather email addresses, since they may be readily available and exposed via online or other accessible data sets (ex: [Social Media](https://attack.mitre.org/techniques/T1593/001) or [Search Victim-Owned Websites](https://attack.mitre.org/techniques/T1594)).(Citation: HackersArise Email)(Citation: CNET Leaks) Email addresses could also be enumerated via more active means (i.e. [Active Scanning](https://attack.mitre.org/techniques/T1595)), such as probing and analyzing responses from authentication services that may reveal valid usernames in a system.(Citation: GrimBlog UsernameEnum) For example, adversaries may be able to enumerate email addresses in Office 365 environments by querying a variety of publicly available API endpoints, such as autodiscover and GetCredentialType.(Citation: GitHub Office 365 User Enumeration)(Citation: Azure Active Directory Reconnaisance) Gathering this information may reveal opportunities for other forms of reconnaissance (ex: [Search Open Websites/Domains](https://attack.mitre.org/techniques/T1593) or [Phishing for Information](https://attack.mitre.org/techniques/T1598)), establishing operational resources (ex: [Email Accounts](https://attack.mitre.org/techniques/T1586/002)), and/or initial access (ex: [Phishing](https://attack.mitre.org/techniques/T1566) or [Brute Force](https://attack.mitre.org/techniques/T1110) via [External Remote Services](https://attack.mitre.org/techniques/T1133)).

Research citing this technique

Reports and advisories from the last 90 days that cite this technique.

• 2026-10-15 GuidePoint GRIT: Behind the Help Desk Call: Insights from the Leaked Chats of an IT-Impersonation Extortion Crew

Detection coverage

SigmaHQ community rules

• Potential Unconstrained Delegation Discovery Via Get-ADComputer - ScriptBlock (core)

Elastic and Splunk rules

• Kerberos User Enumeration (splunk)

Signal counts reflect the current corpus snapshot. Research citations are the technique IDs named in vendor reports and government advisories from the last 90 days; KEV mappings come from MITRE CTID. Coverage is the SigmaHQ rule inventory (core, emerging-threats, threat-hunting) at release r2026-07-01 plus Elastic and Splunk production rules. Rule bodies are not mirrored; links go upstream.