Exfiltration via SMTP

Network Evasion

Exfiltration via SMTP is a technique where attackers leverage the Simple Mail Transfer Protocol (SMTP) to exfiltrate data. This method involves sending stolen data, such as sensitive files or system information, via email to an attacker-controlled email account. By using email traffic, attackers can often bypass traditional network monitoring solutions since SMTP traffic is usually deemed legitimate.

To execute …

kernel flag inspection via sysctl

Anti-Debugging

The sysctl anti-debugging technique can be abused by malware to detect and evade debugging tools on macOS or BSD-like systems. By querying the kernel for process information, malware checks flags (e.g., 0x800) to see if a debugger is attached. If detected, the malware can terminate, alter behavior, or enter a dormant state to avoid analysis.

This technique blends …

Indirect Memory Writing

Antivirus/EDR Evasion

Data Obfuscation

In local memory movement scenarios, for example, when a loader places a payload into memory for execution, antimalware can detect malicious activity at the moment the payload bytes are written into the newly allocated executable memory region. Attackers may try to evade such detection by avoiding direct writes to new memory region and instead relying on other, legitimate Windows APIs …

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