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How hackers are using Microsoft Exchange Server zero-day vulnerabilities


Mar 16, 2021
Since the revelation of four zero-day vulnerabilities currently affecting Microsoft Exchange Server, Check Point Research (CPR) seen hundreds of exploit attempts against organisations worldwide.
In a single 24-hour periods, the number exploitation attempts on tracked organisations doubled every two to three hours, with Government/Military being the most targeted (17% of all exploit attempts), followed by Manufacturing (14%), and Banking (11%).
To date, hackers have yet to carry out the full chain of attack successfully, according to CPR researchers.
Since the recently-disclosed vulnerabilities on Microsoft Exchange Servers, a full race has started amongst hackers and security professionals. Global experts are using massive preventative efforts to combat hackers who are working day-in and day-out to produce an exploit that can successfully leverage the remote code execution vulnerabilities in Microsoft Exchange. ....

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Rushed to Market: DearCry Ransomware Targeting Exchange Bug


DearCry ransomware appends .CRYPT to forcibly encrypted files. (Source: Sophos)
Fresh ransomware targeting as-yet-unpatched on-premises Exchange servers appears to have been rushed to market, with attackers seeking to capitalize on new opportunities before the competition stepped in, security firm Sophos reports.
Sophos has published a teardown of the new DearCry ransomware, which it describes as being unsophisticated and apparently created by a beginner. The ransomware was first spotted in the wild on March 9.
DearCry targets a critical proxy-logon flaw in Microsoft Exchange email servers, which was one of four zero-day flaws Microsoft patched via software updates issued on March 2, when it warned that the flaws were already being exploited in the wild. ....

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How Did the Exchange Server Exploit Leak?


BankInfoSecurity
May 5, 2021
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It has been an open question as to how a half-dozen hacking groups began exploiting Exchange servers in an automated fashion in the days leading up to Microsoft s patches. But there are strong signs that exploit code leaked, and the question now is: Who leaked it?
A Taiwanese computer security researcher indicated on Friday that exploit code he developed and privately shared with Microsoft in early January ended up in hostile hands.
It s an unsatisfactory prospect that how the Exchange exploit leak occurred may never be solved. But it may direct questions back to Microsoft as to whether the MAPP is still worth it.  ....

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