Pierluigi Paganini
June 16, 2022
The BlackCat ransomware gang is targeting unpatched Exchange servers to compromise target networks, Microsoft warns. Microsoft researchers have observed BlackCat ransomware gang targeting unpatched Exchange servers to compromise organizations worldwide. The compromise of Exchange servers allows threat actors to access the target networks, perform internal reconnaissance and lateral movement activities, and steal sensitive documents before encrypting them. “For example, […]
Pierluigi Paganini
January 03, 2022
Microsoft released an emergency patch to fix the Y2k22 bug that is breaking email delivery on on-premise Microsoft Exchange servers. Microsoft has rolled out an emergency fix that addresses the Y2k22 bug that is breaking email delivery on on-premise Microsoft Exchange servers since January 1st, 2022. “We have addressed the issue causing messages to be […]
Pierluigi Paganini
January 01, 2022
Y2k22 bug is causing Microsoft Exchange on-premise servers to fail in delivering email starting on January 1st, 2022. Microsoft Exchange on-premise servers cannot deliver emails starting on January 1st, 2022, due to a bug in the FIP-FS anti-malware scanning engine dubbed Y2k22 bug. FIP-FS is the anti-malware scanning engine used by Microsoft to protect its […]
Pierluigi Paganini
December 16, 2021
Threat actors are using a malicious Internet Information Services (IIS) Server module, dubbed Owowa, to steal Microsoft Exchange credentials. Kaspersky researchers spotted malicious actors while deploying a previously undiscovered binary, an Internet Information Services (IIS) webserver module dubbed “Owowa,” on Microsoft Exchange Outlook Web Access servers to steal credentials and for remote code execution. “Owowa […]
Pierluigi Paganini
November 23, 2021
A researcher has released a proof-of-concept exploit code for an actively exploited vulnerability affecting Microsoft Exchange servers. The researcher Janggggg has published on Sunday a proof-of-concept exploit code for an actively exploited vulnerability, tracked as CVE-2021-42321, in Microsoft Exchange servers. The CVE-2021-42321 is a high-severity remote code execution issue that occurs due to improper validation of […]
Pierluigi Paganini
November 21, 2021
A malware campaign aimed at Microsoft Exchange servers exploits ProxyShell and ProxyLogon issues and uses stolen internal reply-chain emails. A malware campaign aimed at Microsoft Exchange servers exploits ProxyShell and ProxyLogon issues and uses stolen internal reply-chain emails to avoid detection. The campaign was uncovered by TrendMicro researchers that detailed the technique used to trick […]
Pierluigi Paganini
November 18, 2021
U.S., U.K. and Australia warn that Iran-linked APT groups exploiting Fortinet and Microsoft Exchange flaws to target critical infrastructure. A joint advisory released by government agencies (the FBI, the Cybersecurity and Infrastructure Security Agency (CISA), the Australian Cyber Security Centre (ACSC), and the United Kingdomâs National Cyber Security Centre (NCSC)) in the U.S., U.K., and […]
Pierluigi Paganini
September 23, 2021
A flaw in the Microsoft Exchange Autodiscover feature can be exploited to harvest Windows domain and app credentials. Security researchers from Guardicore discovered a flaw in the Microsoft Exchange Autodiscover feature that can be exploited to harvest Windows domain and app credentials from users worldwide. The Microsoft Autodiscover protocol feature of Exchange email servers provides an […]
Pierluigi Paganini
September 03, 2021
The Conti ransomware operators are targeting Microsoft Exchange servers leveraging recently disclosed ProxyShell vulnerability exploits. The Conti ransomware gang is targeting Microsoft Exchange servers leveraging exploits with recently disclosed ProxyShell vulnerabilities. ProxyShell is the name of three vulnerabilities that could be chained by an unauthenticated remote attacker to gain code execution on Microsoft Exchange servers. […]
Pierluigi Paganini
August 31, 2021
ProxyToken is a serious vulnerability in Microsoft Exchange Server that could allow unauthentication attackers to access emails from a target account. Technical details of a serious vulnerability in the Microsoft Exchange Server, dubbed ProxyToken (CVE-2021-33766), were publicly disclosed. The issue could be exploited by an unauthenticated attacker to access emails from a target account. An […]
