Microsoft Exchange vulnerability actively exploited

As it turns out, there was another actively exploited vulnerability included in Microsoft’s patch Tuesday updates for February. When Microsoft said in its update guide for CVE-2024-21410 that the vulnerability was likely to be exploited by attackers, they weren’t kidding. Read More …

ToddyCat: Keep calm and check logs

ToddyCat is an advanced APT actor that Kaspersky researchers described in a previous publication last year. The group started its activities in December 2020 and has been responsible for multiple sets of attacks against high-profile entities in Europe and Asia. Read More …

Storm-0558: Understanding How Microsoft Failed to Protect Itself

You’re undoubtedly familiar with the so-called Storm-0558 attacks from July 2023. If not a quick recap: these attacks (widely attributed as the work of the Chinese government) compromised a number of high-value Exchange Online mailboxes, including the US Secretary of Read More …

Enhanced Monitoring to Detect APT Activity Targeting Outlook Online

In June 2023, a Federal Civilian Executive Branch (FCEB) agency identified suspicious activity in their Microsoft 365 (M365) cloud environment. The agency reported the activity to Microsoft and the Cybersecurity and Infrastructure Security Agency (CISA), and Microsoft determined that advanced Read More …

New PowerExchange malware backdoors Microsoft Exchange servers

A new PowerShell-based malware dubbed PowerExchange was used in attacks linked to APT34 Iranian state hackers to backdoor on-premise Microsoft Exchange servers. After infiltrating the mail server via a phishing email containing an archived malicious executable, the threat actors deployed Read More …

Microsoft Exchange ProxyShell flaws exploited in new crypto-mining attack

A new malware dubbed ‘ProxyShellMiner’ exploits the Microsoft Exchange ProxyShell vulnerabilities to deploy cryptocurrency miners throughout a Windows domain to generate profit for the attackers. ProxyShell is the name of three Exchange vulnerabilities discovered and fixed by Microsoft in 2021. Read More …

New wave of attacks use ProxyNotShell/OWASSRF vulnerabilities to target Microsoft Exchange

Researchers at S.C. Bitdefender SRL today warned of a new wave of attacks using known vulnerabilities to target Microsoft Exchange. The researchers started to notice an increase in attacks using ProxyNotShell/OWASSRF exploits to target on-premises Microsoft Exchange deployments at the Read More …

Rackspace confirms Play ransomware was behind recent cyberattack

Texas-based cloud computing provider Rackspace has confirmed that the Play ransomware operation was behind a recent cyberattack that took down the company’s hosted Microsoft Exchange environments. This follows a report last month by cybersecurity firm Crowdstrike, which detailed a new Read More …

FIN7 hackers create auto-attack platform to breach Exchange servers

The notorious FIN7 hacking group uses an automated attack system that exploits Microsoft Exchange and SQL injection vulnerabilities to breach corporate networks, steal data, and select targets for ransomware attacks based on financial size. This system was discovered by Prodaft’s Read More …

CVE-2022-41040 and CVE-2022-41082 – zero-days in MS Exchange

At the end of September, GTSC reported an attack on critical infrastructure that took place in August. During the investigation, experts found that two 0-day vulnerabilities in Microsoft Exchange Server were used in the attack. The first one, later identified Read More …