OpenLoop Health Data Breach: 716k Records Exposed – Telehealth Defense & Hardening

---
title: Potential Web Shell Activity via Telehealth Web Server
id: 8a4b2c1d-9e6f-4a3b-8c2d-1e4f5a6b7c8d
status: experimental
description: Detects suspicious command-line execution spawned by common web server processes (IIS, Apache, Nginx) often associated with web shell deployment on telehealth portals.
references:
  - https://attack.mitre.org/techniques/T1505/003/
author: Security Arsenal
date: 2026/03/24
tags:
  - attack.persistence
  - attack.t1505.003
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    ParentImage|endswith:
      - '\w3wp.exe'
      - '\httpd.exe'
      - '\nginx.exe'
    Image|endswith:
      - '\cmd.exe'
      - '\powershell.exe'
      - '\pwsh.exe'
  condition: selection
falsepositives:
  - Legitimate administrative debugging by authorized staff
level: high
---
title: Database Process Initiating Outbound Network Connection
id: 9c5d3e2f-0f7g-5b4c-9d3e-2f5a6b7c8d9e
status: experimental
description: Detects database server processes initiating unusual outbound connections, a potential sign of data exfiltration via SQL injection tools or unauthorized backup transfers.
references:
  - https://attack.mitre.org/techniques/T1041/
author: Security Arsenal
date: 2026/03/24
tags:
  - attack.exfiltration
  - attack.t1041
logsource:
  category: network_connection
  product: windows
detection:
  selection:
    Image|endswith:
      - '\sqlservr.exe'
      - '\mysqld.exe'
      - '\postgres.exe'
    Initiated: true
    DestinationPort|notin:
      - 1433
      - 1434
      - 5432
      - 3306
  condition: selection
falsepositives:
  - Legitimate database replication or clustering traffic
level: medium

// Hunt for large data egress from backend web servers or DB servers
// Adjust thresholds based on baseline traffic
DeviceNetworkEvents
| where Timestamp > ago(7d)
| where ActionType == "ConnectionAccepted" or ActionType == "ConnectionInitiated"
| where RemotePort in (443, 80)
| where DeviceCategory in ("WebServer", "DatabaseServer")
| summarize TotalBytesSent = sum(SentBytes), TotalBytesReceived = sum(ReceivedBytes) by DeviceName, RemoteUrl
| where TotalBytesSent > 50000000 // 50MB threshold
| project DeviceName, RemoteUrl, TotalBytesSent

-- Hunt for recently created web shells in common web directories
SELECT FullPath, Size, Mtime, Mode, Btime
FROM glob(globs='/*')
WHERE Mtime > now() - 7d
  AND (Name =~ '.php' OR Name =~ '.jsp' OR Name =~ '.asp' OR Name =~ '.ashx')
  AND FullName NOT IN system_lookup(where directory = '/opt/openloop/webroot')

-- Check for suspicious parent-child process relationships
SELECT Pid, Ppid, Name, Exe, CommandLine, Parent.Name AS ParentName
FROM pslist()
WHERE ParentName IN ('w3wp.exe', 'httpd', 'nginx')
  AND Name IN ('cmd.exe', 'powershell.exe', 'bash', 'sh')

#!/bin/bash
# Script to audit web root for recent modifications (Web Shell Check)
# Usage: sudo ./audit_telehealth_webroot.sh /var/www/html

WEB_ROOT=$1
DAYS=7

if [ -z "$WEB_ROOT" ]; then
  echo "Usage: $0 <web_root_path>"
  exit 1
fi

echo "[+] Scanning $WEB_ROOT for files modified in the last $DAYS days..."
echo "-----------------------------------------------------------"

# Find files modified in the last 7 days within the web root
find "$WEB_ROOT" -type f -mtime -$DAYS -ls

echo "[+] Checking for suspicious base64 encoded content in .php files..."
# Grep for common web shell obfuscation patterns (use with caution to avoid load)
grep -r --include="*.php" -l "eval(base64_decode" "$WEB_ROOT" 2>/dev/null

echo "[+] Audit complete. Please review the output for unauthorized changes."