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Chinese cyberespionage group hacks US organisations with Exchange zero-day flaws

Chinese cyberespionage group hacks US organisations with Exchange zero-day flaws
Microsoft believes Chinese APT group Hafnium is using a set of previously unknown Exchange Server vulnerabilities to access mailbox contents and perform remote code execution.
Credit: Microsoft
Microsoft has released emergency patches for four previously unknown vulnerabilities in Exchange Server that a cyberespionage group was exploiting to break into organizations. The flaws allow the extraction of mailbox contents and the installation of backdoors on vulnerable servers.
Microsoft attributes the attacks to a Chinese APT group dubbed Hafnium that has a history of exploiting vulnerabilities in internet-facing servers and targeting Office 365 users. The group has targeted entities in the US including infectious disease researchers, law firms, higher education institutions, defense contractors, policy think tanks, and NGOs. ....

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Chinese cyberespionage group hacks US organisations with Exchange zero-day flaws

Chinese cyberespionage group hacks US organisations with Exchange zero-day flaws
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Chinese cyberespionage group hacks US organizations with Exchange zero-day flaws

MaxKabakov / Getty Images
Microsoft has released emergency patches for four previously unknown vulnerabilities in Exchange Server that a cyberespionage group was exploiting to break into organizations. The flaws allow the extraction of mailbox contents and the installation of backdoors on vulnerable servers.
Microsoft attributes the attacks to a Chinese APT group dubbed Hafnium that has a history of exploiting vulnerabilities in internet-facing servers and targeting Office 365 users. The group has targeted entities in the US including infectious disease researchers, law firms, higher education institutions, defense contractors, policy think tanks, and NGOs.
Authentication bypass
The attacks were initially spotted in January by researchers from security firm Volexity after observing unusual connections and data transfers to suspicious IP addresses from the Exchange servers of some of its customers. A subsequent investigation revealed suspicious POST r ....

Sysinternals Psexec , Exchange Server , Database Availability Group , Active Directory , China Chopper , Unified Messaging , பரிமாற்றம் சேவையகம் , தரவுத்தளம் கிடைக்கும் குழு , செயலில் அடைவு , சீனா இடைநிலை , ஒருங்கிணைந்த செய்தி அனுப்புதல் ,