Malicious Copy and Paste

User Execution – Malicious Copy & Paste (browser/email → shell with obfuscated one-liner) – T1204.004

Execution Prevention: Prevent the execution of unauthorized or malicious code on systems by implementing application control, script blocking, and other execution prevention mechanisms. This ensures that only trusted and authorized code is executed, reducing the risk of malware and unauthorized actions. This mitigation can be implemented through the following measures:

Application Control:

• Use Case: Use tools like AppLocker or Windows Defender Application Control (WDAC) to create whitelists of authorized applications and block unauthorized ones. On Linux, use tools like SELinux or AppArmor to define mandatory access control policies for application execution.
• Implementation: Allow only digitally signed or pre-approved applications to execute on servers and endpoints. (e.g., New-AppLockerPolicy -PolicyType Enforced -FilePath "C:\Policies\AppLocker.xml")

Script Blocking:

• Use Case: Use script control mechanisms to block unauthorized execution of scripts, such as PowerShell or JavaScript. Web Browsers: Use browser extensions or settings to block JavaScript execution from untrusted sources.
• Implementation: Configure PowerShell to enforce Constrained Language Mode for non-administrator users. (e.g., Set-ExecutionPolicy AllSigned)

Executable Blocking:

• Use Case: Prevent execution of binaries from suspicious locations, such as %TEMP% or %APPDATA% directories.
• Implementation: Block execution of .exe, .bat, or .ps1 files from user-writable directories.

Dynamic Analysis Prevention:

• Use Case: Use behavior-based execution prevention tools to identify and block malicious activity in real time.
• Implemenation: Employ EDR solutions that analyze runtime behavior and block suspicious code execution.

Network Intrusion Prevention: Use intrusion detection signatures to block traffic at network boundaries.

Restrict Web-Based Content: Restricting web-based content involves enforcing policies and technologies that limit access to potentially malicious websites, unsafe downloads, and unauthorized browser behaviors. This can include URL filtering, download restrictions, script blocking, and extension control to protect against exploitation, phishing, and malware delivery. This mitigation can be implemented through the following measures:

Deploy Web Proxy Filtering:

• Use solutions to filter web traffic based on categories, reputation, and content types.
• Enforce policies that block unsafe websites or file types at the gateway level.

Enable DNS-Based Filtering:

• Implement tools to restrict access to domains associated with malware or phishing campaigns.
• Use public DNS filtering services to enhance protection.

Enforce Content Security Policies (CSP):

• Configure CSP headers on internal and external web applications to restrict script execution, iframe embedding, and cross-origin requests.

Control Browser Features:

• Disable unapproved browser features like automatic downloads, developer tools, or unsafe scripting.
• Enforce policies through tools like Group Policy Management to control browser settings.

Monitor and Alert on Web-Based Threats:

• Use SIEM tools to collect and analyze web proxy logs for signs of anomalous or malicious activity.
• Configure alerts for access attempts to blocked domains or repeated file download failures.