Microsoft Confirms Hacking of Outlook & OneDrive – Layer 7 DDoS Attacks

Recently, it’s been confirmed by Microsoft that the current outage problems experienced by the following services of Microsoft were due to intentional Layer 7 DDoS attacks:-

  • Azure
  • Outlook
  • OneDrive

The credit for the attacks goes to a threat actor called Storm-1359 (aka Anonymous Sudan), as per Microsoft’s findings.

Microsoft observed a rise in web traffic targeting specific services starting in early June 2023, resulting in temporary availability issues.

Without any delay, Microsoft instantly started monitoring the ongoing DDoS attacks thoroughly by launching a quick investigation.

Layer 7 DDoS Attacks

Rather than targeting layer 3 or layer 4, the recent DDoS attacks have primarily targeted layer 7.

OSI Layers

To enhance customer protection against similar DDoS attacks, Microsoft strengthened layer 7 defenses by optimizing Azure Web Application Firewall (WAF).

Microsoft discovered that Storm-1359 could use different cloud services and open proxies to launch DDoS attacks using several botnets and tools.

Moreover, here below, we have mentioned the main focuses of Storm-1359:-

  • Causing disruptions
  • Attracting public attention

In a report published recently, Microsoft provided an introductory analysis of the root cause, suggesting DDoS attacks as the potential reason behind the Azure outage, highlighting a noticeable surge in network traffic.

In a Layer 7 DDoS attack, threat actors specifically direct their efforts towards the application level, aiming to overload services by flooding them with excessive requests.

This huge flood of requests overwhelms the services, causing them to become unresponsive since they cannot handle the load.

The threat actors employ multiple DDoS methods to overpower a web service, exhausting its connection pool and causing it to accept new requests.

Types of DDoS Attack Traffic

Here below, we have mentioned all the types of layer 7 DDoS attack traffic:-

  • HTTP(S) flood attack
  • Cache bypass
  • Slowloris


Here below, we have mentioned all the recommendations offered by Microsoft:-

  • To protect web apps, make sure to use layer 7 protection services like Azure Web Application Firewall (WAF).
  • Stay protected against known bad bots by implementing the bot protection managed rule set.
  • Make sure to block the IP addresses and ranges that you identify as malicious.
  • Unknown and suspicious traffic should be blocked.
  • To block and limit the HTTP or HTTPS attacks automatically that have known signatures, create custom WAF rules.

Looking For an All-in-One Multi-OS Patch Management Platform – Try Patch Manager Plus

Guru baran

Recent Posts

Cactus Ransomware Exploiting Qlik Sense code execution Vulnerability

A new Cactus Ransomware was exploited in the code execution vulnerability to Qlik Sense for initial access. Qlik Sense is…

6 hours ago

Hackers Bypass Antivirus with ScrubCrypt Tool to Install RedLine Malware

The ScrubCrypt obfuscation tool has been discovered to be utilized in attacks to disseminate the RedLine Stealer malware, and its new variant was being marketed in…

8 hours ago

Hotel’s Hacked Logins Let Attacker Steal Guest Credit Cards

According to a recent report by Secureworks, a well-planned and advanced phishing attack was carried out, specifically targeting hotels and…

9 hours ago

Critical Zoom Vulnerability Let Attackers Take Over Meetings

Zoom, the most widely used video conferencing platform has been discovered with a critical vulnerability that threat actors could potentially…

10 hours ago

Hackers Using Weaponized Invoice to Deliver LUMMA Malware

Hackers use weaponized invoices to exploit trust in financial transactions, embedding malware or malicious links within seemingly legitimate payment requests. …

1 day ago

US-Seized Crypto Currency Mixer Used by North Korean Lazarus Hackers

The U.S. Treasury Department sanctioned the famous cryptocurrency mixer Sinbad after it was claimed that the North Korean hacker group…

1 day ago