MikeGPT CyberSecurity

# Actionable Guidance for Proofpoint # Generated: 2026-01-26 15:41:19 # Step 1: Navigate to TAP Dashboard → Threat Insight → Campaigns # Purpose: Identify the specific 'Energy Sector' campaign and extract the malicious SharePoint URL indicators. Use the 'Campaigns' view to correlate the SharePoint links with the specific BEC actors involved. # Expected: Isolation of the specific malicious SharePoint URL string and the associated sender IP/domains for immediate blocking. # Step 2: Navigate to Threat Response (TRAP) Console → Incidents → Create Incident # Purpose: Initiate a retrospective remediation (Auto-Pull) for messages containing the identified SharePoint URL that were delivered before the threat intelligence was updated. This bypasses client-side inbox rules that may have moved the message to hidden folders. # Expected: Creation of an incident ID that automatically scans all mailboxes, identifies delivered copies of the phishing email, and moves them to the Quarantine folder. # Step 3: Navigate to PPS Admin Console → Email Protection → Spam Detection → URL Defense → Blocked URLs # Purpose: Update the global URL Defense policy to explicitly condemn the specific SharePoint file path used in this campaign. This ensures that even if a user clicks a rewritten link, access is denied at the time of click. # Expected: Immediate blocking of the SharePoint link for all users; subsequent clicks will be redirected to the Proofpoint Block Page. # Verification Steps: # - Review Threat Response (TRAP) Incident Activity Log # Expected: Status should show 'Success' or 'Quarantined' for identified messages, confirming they have been removed from user inboxes regardless of user-created inbox rules. # - Navigate to TAP Dashboard → Reports → Clicks Blocked # Expected: Presence of entries matching the malicious SharePoint URL with a 'Blocked' status, confirming the URL Defense policy update is active and protecting users.

rule Energy_Sector_SharePoint_Phish { meta: description = "Detects HTML artifacts related to SharePoint phishing and BEC campaigns targeting Energy sector" author = "Threat Rundown" date = "2026-01-26" reference = "https://securityaffairs.com/?p=187332" severity = "medium" tlp = "white" strings: $s1 = "SharePoint" ascii wide nocase $s2 = "review document" ascii wide nocase $s3 = "energy" ascii wide nocase $html_tag = "href=" ascii wide $susp_url_part = "sharepoint.com/:f:/" ascii wide // Generic BEC indicators based on threat intel tags $bec_1 = "urgent wire" ascii wide nocase $bec_2 = "change of banking" ascii wide nocase condition: (any of ($s*) and $html_tag and $susp_url_part) or (any of ($bec*)) }

index=security sourcetype="xmlwineventlog:security" OR sourcetype="o365:management:activity" (EventCode=4662 OR Operation="New-InboxRule" OR Operation="Set-InboxRule") | eval risk_score=case( match(Parameters, "DeleteMessage"), 80, match(Parameters, "ForwardTo"), 90, match(Parameters, "MarkAsRead"), 70, 1==1, 25) | where risk_score >= 70 | table _time, UserId, Operation, Parameters, risk_score | sort -_time

$computers = "EXCHANGESERVER01" # Connect to Exchange Online or Local Exchange before running Write-Host "Auditing Inbox Rules for Suspicious Forwarding/Deletion..." -ForegroundColor Cyan $SuspiciousRules = Get-InboxRule -ResultSize Unlimited | Where-Object { ($_.ForwardTo -ne $null) -or ($_.DeleteMessage -eq $true) -or ($_.MarkAsRead -eq $true) } foreach ($rule in $SuspiciousRules) { Write-Host "[ALERT] Suspicious Rule Found:" -ForegroundColor Red Write-Host " User: $($rule.MailboxOwnerId)" Write-Host " Rule Name: $($rule.Name)" Write-Host " Action: ForwardTo: $($rule.ForwardTo) | Delete: $($rule.DeleteMessage)" }