Credentials from Web Browsers
Adversaries may acquire credentials from web browsers by reading files specific to the target browser. 
Web browsers commonly save credentials such as website usernames and passwords so that they do not need to be entered manually in the future. Web browsers typically store the credentials in an encrypted format within a credential store; however, methods exist to extract plaintext credentials from web browsers.
For example, on Windows systems, encrypted credentials may be obtained from Google Chrome by reading a database file,
AppData\Local\Google\Chrome\User Data\Default\Login Data and executing a SQL query:
SELECT action_url, username_value, password_value FROM logins;. The plaintext password can then be obtained by passing the encrypted credentials to the Windows API function
CryptUnprotectData, which uses the victim’s cached logon credentials as the decryption key. 
Adversaries may also acquire credentials by searching web browser process memory for patterns that commonly match credentials.
After acquiring credentials from web browsers, adversaries may attempt to recycle the credentials across different systems and/or accounts in order to expand access. This can result in significantly furthering an adversary's objective in cases where credentials gained from web browsers overlap with privileged accounts (e.g. domain administrator).
Empire can use modules that extract passwords from common web browsers such as Firefox and Chrome.
Organizations may consider weighing the risk of storing credentials in web browsers. If web browser credential disclosure is a significant concern, technical controls, policy, and user training may be used to prevent storage of credentials in web browsers.
Identify web browser files that contain credentials such as Google Chrome’s Login Data database file:
AppData\Local\Google\Chrome\User Data\Default\Login Data. Monitor file read events of web browser files that contain credentials, especially when the reading process is unrelated to the subject web browser. Monitor process execution logs to include PowerShell Transcription focusing on those that perform a combination of behaviors including reading web browser process memory, utilizing regular expressions, and those that contain numerous keywords for common web applications (Gmail, Twitter, Office365, etc.).
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