cyber attack

Microsoft, the tech giant known for its flagship office suite and popular applications like Outlook and OneDrive, recently faced a series of disruptive service outages due to distributed denial-of-service (DDoS) attacks. These attacks affected not only Microsoft’s office suite but also its Azure cloud computing platform. In this article, we will take a closer look at the incident and delve into the details of the attacks, the group behind them, and the implications for Microsoft and its customers.

The Storm-1359 Incident: A Brief Overview

In early June 2023, Microsoft’s services, including Outlook, OneDrive, and Azure, experienced intermittent disruptions that impacted their availability. Initially, Microsoft remained silent about the cause of these disruptions, leaving customers and the cybersecurity community speculating about the source of the problem. However, the company has now come forward and disclosed that the disruptions were the result of DDoS attacks orchestrated by a group known as “Anonymous Sudan.”

Anonymous Sudan: Hacktivists with a Russian Connection?

Anonymous Sudan is a hacktivist group that has been making waves in the cybersecurity landscape with a series of DDoS attacks against organizations worldwide. While the group claims to be defending Islam, experts believe that it has ties to the pro-Russian threat actor group KillNet. KillNet gained notoriety during the Russian-Ukraine conflict and has been involved in various cyber activities, including DDoS attacks on healthcare entities hosted in Microsoft Azure.

The collaboration between Anonymous Sudan and KillNet extends beyond DDoS attacks. The two groups have also formed a “DARKNET parliament” and orchestrated cyber attacks on European and U.S. financial institutions. Their ultimate goal is to paralyze the work of SWIFT, a global financial messaging system. It is evident that Anonymous Sudan’s actions are driven by both disruption and publicity.

The Mechanics of the Attacks

Microsoft has shed some light on the techniques employed by the attackers. They utilized rented cloud infrastructure and virtual private networks (VPNs) to launch their assault on Microsoft servers. The attackers also utilized botnets, which are networks of compromised computers from various locations worldwide. By overwhelming the sites with junk traffic, the attackers were able to disrupt the services provided by Microsoft.

The DDoS attacks employed various tactics, including HTTP(S) flood attacks, cache bypass, and Slowloris. HTTP(S) flood attacks involve bombarding the target services with a high volume of HTTP(S) requests. Cache bypass attempts to overload the origin servers by bypassing the content delivery network (CDN) layer. Slowloris is a technique where the client opens a connection to a web server, requests a resource, and then fails to acknowledge the download or accepts it slowly. This forces the web server to keep the connection open and the requested resource in memory.

Impact on Microsoft and its Customers

While Microsoft has assured its customers that there is no evidence of unauthorized access or compromise of customer data during the attacks, the disruptions caused by the DDoS attacks had a temporary impact on the availability of certain services. The scale of the impact and the number of affected customers have not been explicitly disclosed by Microsoft. However, it is important to note that successful disruptions of a software service giant like Microsoft can have far-reaching consequences, impacting the work of millions and causing disruptions in global commerce.

Microsoft’s Response and Attribution

In response to the attacks, Microsoft has assigned the attackers the name Storm-1359. This temporary designation is used when the company has yet to determine the affiliation of a particular group. Conducting thorough cybersecurity investigations takes time and presents challenges, especially when dealing with skilled adversaries like Anonymous Sudan.

Microsoft’s acknowledgement of Anonymous Sudan as the group behind the attacks confirms the claim made by the hacktivist group on the Telegram social media channel. However, the company has not explicitly linked Storm-1359 to Anonymous Sudan’s affiliation with KillNet or their supposed ties to Russia. The exact nature of Anonymous Sudan’s connection to Russia remains a topic of speculation among cybersecurity experts.

The Significance of DDoS Attacks

DDoS attacks, while typically regarded as nuisances that render websites temporarily inaccessible, can have significant implications, especially when targeting a software service giant like Microsoft. Successful disruptions of services can cause major disruptions to businesses, individuals, and even global commerce. The Storm-1359 incident serves as a reminder of the need for robust cybersecurity measures to mitigate the impact of such attacks.

The Role of Attribution in Cybersecurity

Attributing cyber attacks to specific threat actors or groups is a complex process. It requires extensive research, analysis, and collaboration between cybersecurity experts and law enforcement agencies. In the case of Storm-1359, Microsoft’s attribution of the attacks to Anonymous Sudan highlights the ongoing efforts to identify and hold accountable those responsible for cyber attacks. Attribution not only helps in understanding the motives and tactics of the attackers but also assists in developing effective defense strategies.


The Storm-1359 incident, where Microsoft’s services were disrupted by DDoS attacks orchestrated by Anonymous Sudan, sheds light on the evolving threat landscape and the need for robust cybersecurity measures. While the attacks caused temporary disruptions and did not result in unauthorized access to customer data, the incident serves as a reminder of the potential impact of DDoS attacks on software service providers. Microsoft’s attribution of the attacks to Anonymous Sudan emphasizes the ongoing efforts to identify and address cyber threats. As the cybersecurity landscape continues to evolve, organizations must remain vigilant and proactive in their defense against such attacks.

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