Threat Hunting

T1110-003 Lab Link Scenario Adversaries may use a single or small list of commonly used passwords against many different accounts to attempt to acquire valid account credentials. Password spraying uses one password (e.g. ‘Password01’), or a small list of commonly used passwords, that may match the complexity policy of the domain. Logins are attempted with that password against many different accounts on a network to avoid account lockouts that would normally occur when brute forcing a single account with many passwords. Typically, management services over commonly used ports are used when password spraying. Commonly targeted services include the following: SSH (22/TCP) Telnet (23/TCP) FTP (21/TCP) NetBIOS / SMB / Samba (139/TCP & 445/TCP) LDAP (389/TCP) Kerberos (88/TCP) RDP / Terminal Services (3389/TCP) HTTP/HTTP Management Services (80/TCP & 443/TCP) MSSQL (1433/TCP) Oracle (1521/TCP) MySQL (3306/TCP) VNC (5900/TCP) In addition to management services, adversaries may “target single sign-on (SSO) and cloud-based applications utilizing federated authentication protocols,” as well as externally facing email applications, such as Office 365.[ In default environments, LDAP and Kerberos connection attempts are less likely to trigger events over SMB, which creates Windows “logon failure” event ID 4625. Q1 Who was the last logged-in user? ...