Microsoft IIS Service Account Credential Access via AppCmd

Adversaries can leverage the Internet Information Services (IIS) administrative tool, AppCmd.exe, to query application pool configurations. By specifically requesting the output of configuration sections in XML or text format, attackers can reveal sensitive credentials stored in plain text or decryptable formats, facilitating lateral movement or privilege escalation from within a DMZ environment.

Impact

Successful execution allows an attacker to obtain the service account credentials used by IIS application pools, potentially leading to unauthorized access to linked databases, file shares, or further compromise of the host and internal network.

Recommendation

• Deploy the provided Sigma rule to monitor for suspicious command-line patterns involving AppCmd.
• Audit existing IIS application pool configurations to ensure they do not store sensitive information that is easily accessible.
• Restrict the use of administrative utilities like AppCmd.exe to authorized system administrators only.
• Implement process monitoring to identify and block unauthorized or anomalous execution of AppCmd.exe.