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The Hacker News - Cybersecurity News and Analysis: ProxyLogon

Hackers Exploiting ProxyLogon and ProxyShell Flaws in Spam Campaigns

Hackers Exploiting ProxyLogon and ProxyShell Flaws in Spam Campaigns

November 22, 2021Ravie Lakshmanan
Threat actors are exploiting ProxyLogon and ProxyShell exploits in unpatched Microsoft Exchange Servers as part of an ongoing spam campaign that leverages stolen email chains to bypass security software and deploy malware on vulnerable systems. The findings come from Trend Micro following an investigation into a number of intrusions in the Middle East that culminated in the distribution of a never-before-seen loader dubbed SQUIRRELWAFFLE. First publicly  documented  by Cisco Talos, the attacks are believed to have commenced in mid-September 2021 via laced Microsoft Office documents. "It is known for sending its malicious emails as replies to pre-existing email chains, a tactic that lowers a victim's guard against malicious activities," researchers Mohamed Fahmy, Sherif Magdy, Abdelrhman Sharshar  said  in a report published last week. "To be able to pull this off, we believe it involved the use of a chain of both ProxyLogon and ProxyShell exploits." ProxyLo
Hackers Actively Searching for Unpatched Microsoft Exchange Servers

Hackers Actively Searching for Unpatched Microsoft Exchange Servers

August 13, 2021Ravie Lakshmanan
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 "ProxyShell." At least 30,000 machines are affected by the vulnerabilities,  according  to a Shodan scan performed by Jan Kopriva of SANS Internet Storm Center. "Started to see in the wild exploit attempts against our honeypot infrastructure for the Exchange ProxyShell vulnerabilities," NCC Group's Richard Warren  tweeted , noting that one of the intrusions resulted in the deployment of a "C# aspx webshell in the /aspnet_client/ directory." Patched in early March 2021,  ProxyLogon  is the moniker for CVE-2021-26855, a server-side request forgery vulnerability in Exchange Server tha
ProxyLogon PoC Exploit Released; Likely to Fuel More Disruptive Cyber Attacks

ProxyLogon PoC Exploit Released; Likely to Fuel More Disruptive Cyber Attacks

March 11, 2021Ravie Lakshmanan
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) and the Federal Bureau of Investigation (FBI) on Wednesday issued a joint advisory warning of active exploitation of vulnerabilities in Microsoft Exchange on-premises products by nation-state actors and cybercriminals. "CISA and FBI assess that adversaries could exploit these vulnerabilities to compromise networks, steal information, encrypt data for ransom, or even execute a destructive attack," the agencies  said . "Adversaries may also sell access to compromised networks on the dark web." The attacks have primarily targeted local governments, academic institutions, non-governmental organizations, and business entities in various industry sectors, including agriculture, biotechnology, aerospace, defense, legal services, power utilities, and pharmaceutical, which the agencies say are in line with previous activity conducted by Chinese cyber actors. Tens of thousands of entities, including the  Eur
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