Malicious actors are deploying a previously undiscovered binary, an Internet Information Services (IIS) webserver module dubbed “Owowa,” on Microsoft Exchange Outlook Web Access servers with the goal of stealing credentials and enabling remote command execution. “Owowa is a C#-developed .NET v4.0 assembly that is intended to be loaded as a module within an IIS web …
Summary Actions to Take Today to Protect Against Iranian State-Sponsored Malicious Cyber Activity• Immediately patch software affected by the following vulnerabilities: CVE-2021-34473, 2018-13379, 2020-12812, and 2019-5591.• Implement multi-factor authentication.• Use strong, unique passwords. Note: this advisory uses the MITRE Adversarial Tactics, Techniques, and Common Knowledge (ATT&CK®) framework, version 10. See the ATT&CK for Enterprise for all …
Microsoft has released security updates as part of its monthly Patch Tuesday release cycle to address 55 vulnerabilities across Windows, Azure, Visual Studio, Windows Hyper-V, and Office, including fixes for two actively exploited zero-day flaws in Excel and Exchange Server that could be abused to take control of an affected system. Of the 55 glitches, …
An unpatched design flaw in the implementation of Microsoft Exchange’s Autodiscover protocol has resulted in the leak of approximately 100,000 login names and passwords for Windows domains worldwide. “This is a severe security issue, since if an attacker can control such domains or has the ability to ‘sniff’ traffic in the same network, they can …
An ongoing campaign has been found to leverage a network of websites acting as a “dropper as a service” to deliver a bundle of malware payloads to victims looking for “cracked” versions of popular business and consumer applications. “These malware included an assortment of click fraud bots, other information stealers, and even ransomware,” researchers from …
Details have emerged about a now-patched security vulnerability impacting Microsoft Exchange Server that could be weaponized by an unauthenticated attacker to modify server configurations, thus leading to the disclosure of Personally Identifiable Information (PII). The issue, tracked as CVE-2021-33766 (CVSS score: 7.3) and coined “ProxyToken,” was discovered by Le Xuan Tuyen, a researcher at the …
The U.S. Cybersecurity and Infrastructure Security Agency is warning of active exploitation attempts that leverage the latest line of “ProxyShell” Microsoft Exchange vulnerabilities that were patched earlier this May, including deploying LockFile ransomware on compromised systems. Tracked as CVE-2021-34473, CVE-2021-34523, and CVE-2021-31207, the vulnerabilities enable adversaries to bypass ACL controls, elevate privileges on the Exchange …
Threat actors are actively carrying out opportunistic scanning and exploitation of Exchange servers using a new exploit chain leveraging a trio of flaws affecting on-premises installations, making them the latest set of bugs after ProxyLogon vulnerabilities were exploited en masse at the start of the year. The remote code execution flaws have been collectively dubbed …
A Chinese cyberespionage group known for targeting Southeast Asia leveraged flaws in the Microsoft Exchange Server that came to light earlier this March to deploy a previously undocumented variant of a remote access trojan (RAT) on compromised systems. Attributing the intrusions to a threat actor named PKPLUG (aka Mustang Panda and HoneyMyte), Palo Alto Networks’ …
The U.S. government and its key allies, including the European Union, the U.K., and NATO, formally attributed the massive cyberattack against Microsoft Exchange email servers to state-sponsored hacking crews working affiliated with the People’s Republic of China’s Ministry of State Security (MSS). In a statement issued by the White House on Monday, the administration said, …