MikeGPT CyberSecurity

# Zscaler Internet Access (ZIA) Configuration Guidance # Goal: Mitigate exposure to external threats like the FortiWeb vulnerability and phishing campaigns. # --- Immediate Action 1: Isolate High-Risk Web Categories --- # This prevents credential theft from phishing sites like the fake travel portals. 1. Navigate to 'Policy' -> 'URL & Cloud App Control'. 2. Select the 'URL Filtering Policy' tab. 3. Add a new rule or edit an existing one for high-risk users. 4. In the 'URL Categories' section, select categories such as 'Newly Registered and Observed Domains'. 5. Set the action for this category to 'Isolate'. 6. Activate the policy change. # --- Immediate Action 2: Shield Appliance Management Interfaces --- # This uses Zscaler's firewall to protect vulnerable on-premise devices like FortiWeb. 1. Navigate to 'Policy' -> 'Firewall Control'. 2. Add a new 'Firewall Filtering' rule. 3. Set the 'Source IP Groups' to 'Any'. 4. Set the 'Destination IP Groups' to a group containing the public IP of your FortiWeb management interface. 5. Set the 'Network Services' to the specific management ports (e.g., HTTPS/443). 6. Set the 'Action' to 'Block/Drop'. 7. Create a second rule with a higher precedence that allows access only from a 'Source IP Group' containing your trusted admin IPs. 8. Activate the policy change. # --- Verification Step 1: Review Isolation Logs --- 1. Navigate to 'Analytics' -> 'Web Insights' -> 'Logs'. 2. Add a filter for 'Threat Category' and select 'Isolated by Browser Isolation'. 3. Monitor these logs to ensure the policy is working and to identify users frequently accessing high-risk sites. # --- Verification Step 2: Test Firewall Rule --- 1. From an untrusted external IP address, attempt to access the FortiWeb management interface. 2. Confirm the connection is blocked. 3. From a trusted admin IP address (as defined in your allow rule), confirm you can still access the interface.

rule Detect_ImunifyAV_Exploit_Attempt_Nov25 { meta: description = "Detects potential exploit artifacts related to the ImunifyAV RCE vulnerability affecting the AI-bolit component." author = "Threat Rundown" date = "2025-11-14" reference = "https://lifeboat.com/blog/2025/11/rce-flaw-in-imunifyav-puts-millions-of-linux-hosted-sites-at-risk" severity = "high" tlp = "white" strings: $s1 = "AI-bolit scanner exploit payload" $s2 = "/var/imunify360/aibolit/" $s3 = "imunify-av --update-force" $h1 = { 2F 74 6D 70 2F [2-4] 2E 73 68 } // /tmp/*.sh shell script execution attempt condition: any of them }

// Splunk QL Query to detect potential FortiWeb Authentication Bypass index=firewall sourcetype="fortinet:fortiweb:log" (eventtype="fortiweb-event-admin-login-success" OR eventtype="fortiweb-event-admin-login-failed") | stats count(eval(action="failure")) as failed_logins, count(eval(action="success")) as successful_logins by src_ip, user, device_id | where failed_logins > 5 AND successful_logins > 0 | eval risk_score=case( (failed_logins > 20), 100, (failed_logins > 5), 75, 1==1, 50) | `comment("Looks for multiple failed logins followed by a success from the same source IP, a common pattern for brute-force or bypass exploits.")` | table _time, src_ip, user, device_id, failed_logins, successful_logins, risk_score | sort -risk_score

# PowerShell script to check for Indicators of Compromise related to the Cisco ISE Zero-Day # This is a template. Replace IOCs with specific intelligence. $computers = Get-Content -Path .\serverlist.txt $iocs = @{ "C:\Windows\Temp\ise_exploit.dll" = "<file_hash_placeholder>"; "HKLM:\SOFTWARE\Cisco\ISE\ExploitFlag" = "1" } Write-Host "Starting IOC scan for Cisco ISE Zero-Day..." foreach ($computer in $computers) { if (Test-Connection -ComputerName $computer -Count 1 -Quiet) { Write-Host "- Checking $computer..." foreach ($ioc in $iocs.GetEnumerator()) { if ($ioc.Key.StartsWith("HKLM:")) { # Check Registry Key try { $regValue = Invoke-Command -ComputerName $computer -ScriptBlock { Get-ItemProperty -Path $using:ioc.Key -ErrorAction Stop } | Select-Object -ExpandProperty $ioc.Value if ($regValue) { Write-Host " [!!] FOUND IOC on $computer: Registry key $($ioc.Key) exists." -ForegroundColor Red } } catch {} } else { # Check File Path if (Invoke-Command -ComputerName $computer -ScriptBlock { Test-Path -Path $using:ioc.Key }) { Write-Host " [!!] FOUND IOC on $computer: File $($ioc.Key) exists." -ForegroundColor Red # Add hash verification here if needed } } } } else { Write-Host "- Could not connect to $computer." -ForegroundColor Yellow } } Write-Host "Scan complete."