Defending Microsoft 365: Combatting ATO and Brute Force Attacks with HTTP Client Tools

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Greetings Windows enthusiasts and cyber warriors! Buckle up as we delve into the dark alleys of cybercrime, where villains are getting more innovative every day. Today we're unpacking a new method of attack on the beloved Microsoft 365 platform using HTTP client tools to commandeer accounts. Let's dive into this digital battlefield and arm ourselves with knowledge.

The Exploit Elevated: Axios and Node Fetch​

Recently, an alarming report by Proofpoint has unveiled a trend where cybercriminals tap into HTTP client tools to launch extensive account takeover (ATO) attacks against Microsoft 365 accounts. This might sound like something out of a cyberpunk novel, but it's the reality in our rapidly digitizing world.

Axios in AiTM Attacks

Axios, a familiar name among developers, is an HTTP client designed for making HTTP requests in Node.js. Used with reverse proxy platforms like Evilginx, it gains the sinister ability to bypass multifactor authentication (MFA) with a 38% success rate. That's like having a sneak-thief who has your house keys but also slips past your security system without a hint of suspicion.
But here’s the kicker: these Axios-powered attacks often start with phishing emails cunning enough to trick even the wary. Once a victim's credentials are compromised, threat actors strike Microsoft 365 login portals like clockwork, modifying mailbox rules and fetching sensitive data as casually as if they were perusing a newspaper.

Node Fetch: The Brute Force Workhorse

Meanwhile, Node Fetch takes on a slightly less sophisticated, but no less dangerous role, in brute force password cracking. This library's simplicity makes it ideal for automation, perfect for cybercriminals aiming to batter down the digital doors with brute force.
From June to December 2024, over 13 million login attempts were recorded. Fortunately, these campaigns had a lower success rate of 2%, primarily targeting under-protected educational domains.

Beyond the Basics: Why HTTP Client Tools?​

You might be asking, "Why use these tools at all?" HTTP clients like Axios and Node Fetch allow attackers to automate high-speed, high-volume credential stuffing and brute force attempts. Moreover, their legitimate uses for developers make them hard to restrict, leaving a loophole for malicious exploits.

A Tactical Response is Needed​

Organizations using Microsoft 365 must recognize the scope of this threat. Standard MFA is no longer foolproof in this new age of AiTM and brute force attacks. Here's how to fight back:
  1. Customize MFA Policies: Shift to adaptive authentication methods that detect and react to suspicious login behaviors. Adaptive MFA can counteract attempts to bypass protective layers through predictable login attempts.
  2. Beef Up Conditional Access: Implement strict conditional access policies that restrict login attempts from unknown locations or devices. Use geographic filters and device compliance checks.
  3. Institute Robust Detection Mechanisms: Employ threat intelligence tools to monitor for misuse of HTTP clients. Advanced log analysis can identify anomaly patterns associated with FastHTTP or other client tools.
  4. Educate Employees: Awareness and training sessions about the latest phishing techniques can erase the edge attackers have over unassuming employees.

Wrapping Up: Vigilance is Key​

The rise of phishing kits and HTTP client tool exploits illustrates the rapid evolution of cyber threats targeting Microsoft 365. As we continue to rely heavily on digital environments for work and personal communication, it becomes paramount that organizations remain vigilant, adaptive, and proactive in safeguarding their users and networks.
In the battle against cybercrime, remember that knowledge is power. Keep your systems updated, your policies robust, and your people informed. Until next time, stay secure and digitally savvy!

Source: GBHackers News Cybercriminals Exploiting HTTP Client Tools to Hijack Microsoft 365 Accounts
 


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