T1556 Modify Authentication Process — ATT&CK Technique
Adversaries may modify authentication mechanisms and processes to access user credentials or enable otherwise unwarranted access to accounts. The authentication process is handled by mechanisms, such as the Local Security Authentication Server (LSASS) process and the Security Accounts Manager (SAM) on Windows, pluggable authentication modules (PAM) on Unix-based systems, and authorization plugins on MacOS systems, responsible for gathering, storing, and validating credentials. By modifying an authentication process, an adversary may be able to authenticate to a service or system without using Valid Accounts. Adversaries may maliciously modify a part of this process to either reveal credentials or bypass authentication mechanisms. Compromised credentials or access may be used to bypass access controls placed on various resources on systems within the network and may even be used for persistent access to remote systems and externally available services, such as VPNs, Outlook Web Access and remote desktop.
Detection coverage (31)
- Github High Risk Configuration Disabled high
- AWS Identity Center Identity Provider Change high
- CA Policy Updated by Non Approved Actor medium
- CA Policy Removed by Non Approved Actor medium
- Certificate-Based Authentication Enabled medium
- New Root Certificate Authority Added medium
- Change to Authentication Method medium
- User Removed From Group With CA Policy Modification Access medium
- User Added To Group With CA Policy Modification Access medium
- Possible Shadow Credentials Added high
- Directory Service Restore Mode(DSRM) Registry Value Tampering high
- Disabled MFA to Bypass Authentication Mechanisms medium
- Cisco Duo Policy Bypass 2FA
- Cisco Duo Admin Login Unusual Browser
- Cisco Duo Admin Login Unusual Country
- Cisco Duo Admin Login Unusual Os
- Cisco Duo Bulk Policy Deletion
- Cisco Duo Bypass Code Generation
- Cisco Duo Policy Allow Devices Without Screen Lock
- Cisco Duo Policy Allow Network Bypass 2FA
- Cisco Duo Policy Allow Old Flash
- Cisco Duo Policy Allow Old Java
- Cisco Duo Policy Allow Tampered Devices
- Cisco Duo Policy Deny Access
- Cisco Duo Policy Skip 2FA for Other Countries
- Cisco Duo Set User Status to Bypass 2FA
- Okta Phishing Detection with FastPass Origin Check
- O365 Disable MFA
- O365 Excessive SSO logon errors
- Disabling Windows Local Security Authority Defences via Registry
- Cisco Network Interface Modifications