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In this article, we explore how threat actors leverage AI-powered browser workflow automation frameworks like “Open Operator” to execute password spray attacks against Microsoft 365 (M365) tenants. Password spray attacks involve trying a single commonly used password across multiple accounts to avoid detection. This technique, combined with AI automation, makes the attack more efficient and harder to trace.
To learn more about the attack, its prevention, mitigation, and detection, check the full blog post: https://lnkd.in/gdM6xHFV
You Should Know:
Here are some practical commands and codes related to cybersecurity and password spray attacks:
1. Detecting Password Spray Attacks in Logs
Use the following PowerShell command to analyze sign-in logs for potential password spray attacks:
Get-AzureADAuditSignInLogs | Where-Object { $_.Status.ErrorCode -eq "50126" } | Format-Table UserPrincipalName, CreatedDateTime
2. Implementing Account Lockout Policies
To mitigate password spray attacks, enforce account lockout policies using Group Policy in Windows:
net accounts /lockoutthreshold:5 /lockoutduration:30 /lockoutwindow:30
3. Monitoring M365 Tenant Activity
Use Microsoft Sentinel (formerly Azure Sentinel) to set up alerts for suspicious activities:
[kql]
SigninLogs
| where ResultType == “50126”
| summarize Count = count() by UserPrincipalName, IPAddress
| where Count > 3
[/kql]
4. Linux Command for Log Analysis
Analyze authentication logs on a Linux server for brute-force attempts:
grep "Failed password" /var/log/auth.log | awk '{print $9}' | sort | uniq -c | sort -nr
5. Preventing Password Spray with Multi-Factor Authentication (MFA)
Enable MFA for all users in your M365 tenant using PowerShell:
Get-MsolUser | ForEach-Object { Set-MsolUser -UserPrincipalName $_.UserPrincipalName -StrongAuthenticationRequirements @{State="Enabled"} }
What Undercode Say:
Password spray attacks are a significant threat to cloud environments like M365. By leveraging AI-powered automation, attackers can scale their efforts while minimizing detection. To defend against such attacks, organizations must implement robust security measures, including:
- Enforcing strong password policies and MFA.
- Monitoring and analyzing sign-in logs for unusual patterns.
- Using advanced threat detection tools like Microsoft Sentinel.
Here are additional commands to enhance your cybersecurity posture:
6. Windows Command for Account Lockout Status
Check the lockout status of a user account:
net accounts
7. Linux Command to Block Suspicious IPs
Use `iptables` to block IPs with multiple failed login attempts:
iptables -A INPUT -p tcp --dport 22 -m recent --name SSH --set iptables -A INPUT -p tcp --dport 22 -m recent --name SSH --update --seconds 60 --hitcount 4 -j DROP
8. PowerShell Command for User Activity Audit
Audit user activity in M365:
Get-AzureADAuditSignInLogs -Top 1000 | Export-Csv -Path "C:\SignInLogs.csv"
By combining these practices with continuous monitoring and employee awareness, organizations can significantly reduce the risk of password spray attacks and other AI-driven threats. For further reading, visit the original article: https://lnkd.in/gdM6xHFV.
References:
Reported By: Pbssubhash M365 – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
