By 247tech March 2, 2021. Please login or register first to view this content. Priority: Critical Summary On 2nd March Microsoft released a number of fixes for vulnerabilities affecting on-premises installations of Exchange Server. First, it would gain access to an Exchange Server either with stolen passwords or by using the previously … If HAFNIUM could authenticate with the Exchange server then they could use this vulnerability to write a file to any path on the server. Regardless of whether it’s China or not, t’s a serious threat being exploited in the wild.”. But TrustedSec discovered that Hafnium hacked very few of the available targets, installing the web shells on a small subset of servers visited and scanned for vulnerabilities over those two days. HAFNIUM targeting Exchange Servers with 0-day exploits Published in Industry News. By the weekend, some researchers were speculating the number of breached systems could reach a hundred thousand. The attacks included three steps. CVE-2021-26858 is a post-authentication arbitrary file write vulnerability in Exchange. In the attacks observed, the threat actor used these vulnerabilities to access on-premises Exchange servers which enabled access to email accounts, and allowed installation of … Simon Sharwood, APAC Editor Wed 3 Mar 2021 // 00:10 UTC. That either means other groups are using the same chain of vulnerabilities or an offshoot of Hafnium is using wildly different tactics, techniques, and procedures in attacks after the announced patches. Now it’s Hafnium, a Chinese group that’s been attacking a vulnerability in Microsoft Exchange Server to sneak into victims’ email inboxes and beyond. HAFNIUM targeting Exchange Servers … SKOUT Threat Advisory 0011-21: HAFNIUM Targeting Exchange Servers with Zero-day Exploits ... At the time of this writing, there are four zero-day exploits that users of Microsoft Exchange Server 2013, 2016, and 2019 need to be aware of. Joe Uchill has been covering cybersecurity since 2014 for publications such as Axios, The Hill and Motherboard. March 2, 2021 marked the day of the release of a Threat Intelligence report by Microsoft, reporting multiple (!) “I think the statement made by Microsoft, that it was initially very targeted is probably correct; Hafnium or whoever is behind this, was very focused in their initial attack, prior to February 27th,” said Tyler Hudak, who is leading the incident response effort for vendor TrustedSec. By clicking “Accept Cookies,” you consent to the usage of cookies described in our, Dynamic Application Security Testing (DAST), Security Information & Event Management (SIEM), Security Automation & Orchestration (SOAR), Threat Advisory: HAFNIUM targeting Exchange Servers with 0-day exploits, https://support.microsoft.com/en-us/topic/description-of-the-security-update-for-microsoft-exchange-server-2019-2016-and-2013-march-2-2021-kb5000871-9800a6bb-0a21-4ee7-b9da-fa85b3e1d23b, https://www.splunk.com/en_us/blog/security/detecting-hafnium-exchange-server-zero-day-activity-in-splunk.html, https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/, https://blog.rapid7.com/2021/03/03/rapid7s-insightidr-enables-detection-and-response-to-microsoft-exchange-0-day/, https://www.rapid7.com/db/?q=hafnium&type=nexpose, C:\Program Files\Microsoft\Exchange Server\V15\Logging\ECP\Server, C:\Program Files\Microsoft\Exchange Server\V15\Logging\OABGeneratorLog, Microsoft Security logs from the Exchange server, Audit Process Creation (Computer Configuration > Policies > Windows Settings > Security Settings > Advanced Audit Configuration > Detailed Tracking), Include command line in process creation events (Administrative Templates\System\Audit Process Creation -> include command line in process creation events), Microsoft Application logs from the Exchange server, Microsoft Powershell logs from the Exchange server, Microsoft Powershell Operational logs from the Exchange server, Script Block Logging enabled (only applicable for PS v5), Module Logging enabled (only applicable for PS v4 & v5, with the following module enabled: Microsoft.Powershell. Microsoft has detected multiple zero-day exploits being used to attack on-premises versions of Microsoft Exchange Server in limited and targeted attacks. Victims could have been hit during the early targeted attacks, the late February vulnerability-scanning period, and during the script-based attack in early March. “We have a lot of questions about that right now. HAFNIUM targeting Exchange Servers FAQ: The Exchange Server team has created a script to run a check for HAFNIUM IOCs to … Press J to jump to the feed. SC Media > Home > Security News > Data Breach > As Hafnium timeline crystalizes, signs of new Microsoft Exchange Server attacks emerge. More information about the vulnerabilities: New nation-state cyberattacks; At Least 30,000 U.S. The collective toll of … Copy. HAFNIUM targeting Exchange Servers with 0-day exploits. Microsoft has released several security updates due to targeted attacks against vulnerabilities found in Microsoft Exchange Server (versions 2013, 2016, and 2019). Microsoft suggests patching these immediately. If HAFNIUM could authenticate with the Exchange server then they could use this vulnerability to write a file to any path on the server. 6 times. It includes a script for admins to check their systems for traces of post-hacking activity, however those checks won’t be complete. Microsoft would not comment on this story. Read 6 times. Microsoft has released out-of-band security updates to address four vulnerabilities in Exchange Server: CVE-2021-26855 allows an unauthenticated attacker to send arbitrary HTTP requests and authenticate as the Exchange Server. Thus far the company has remained steadfast in emphasizing the need to patch the server vulnerabilities. Microsoft has detected multiple 0-day exploits being used to attack on-premises versions of Microsoft Exchange Server in limited and targeted attacks. But as vendors rushed to patch systems, breaches did not appear limited at all. Microsoft has released out-of-band updates for the flaws Tuesday and is urging customers to apply the patches as quickly as possible. “And so, in short, tracking the clusters of adversaries behind this is just a mess.”. Cybersecurity Threat Advisory 0011-21: HAFNIUM Targeting Exchange Servers with Zero-day Exploits. Once access is gained to the on-premise Exchange servers, full contents of user mailboxes can be extracted and exfiltrated outside of the network, as well as the installation of additional malware. Threat Update. By Wednesday, Huntress Labs told SC Media it was seeing hundreds of breached servers. “Everyone needs to take this seriously. Microsoft has detected multiple 0-day exploits being used to attack on-premises versions of Microsoft Exchange Server in limited and targeted attacks. Was that just different adversaries dropping those web shells independently of each other? We recommend prioritizing installing updates on Exchange Servers that are externally facing. Now in the wake of Hafnium, responders are reporting what appear to be other clusters of activity. Davinsi Labs strongly recommends and urges our customers to update on-premise Exchange servers immediately, to assure the following patch is in place: https://support.microsoft.com/en-us/topic/description-of-the-security-update-for-microsoft-exchange-server-2019-2016-and-2013-march-2-2021-kb5000871-9800a6bb-0a21-4ee7-b9da-fa85b3e1d23b. In order to provide threat detection to identify the threat actor’s activity and post-compromise activity, the following datasources are required to be onboarded in your SIEM: We hope the following threat advisory assists to react quickly to ongoing threats and urges the need of patching and security monitoring. Red Canary is tracking three distinct clusters of activity, using different procedures. Microsoft attributes the attacks to a group they have … "Exchange Server is primarily used by business customers, and we have no evidence that Hafnium's activities targeted individual consumers or that … Nickels notes that patching may not be enough, given the opportunism of the hackers. 1 Customers should apply these patches immediately and monitor their Exchange Server deployments for any sign … “On the 27th, that’s when it moves to a much larger scale.”. Specifically, TrustedSec reported a botnet-like distributed vulnerability scan that some actor is using to discover vulnerable targets. Microsoft has detected multiple 0-day exploits being used to attack on-premises versions of Microsoft Exchange Server in limited and targeted attacks. Exchange servers attacked by Hafnium zero-days. For Business, Security. HAFNIUM targeting Exchange Servers with 0-day exploits. Microsoft has categorised this as a critical vulnerabilities and recommended the update the Exchange Server as soon as possible. Microsoft Exchange Server cyberattack timeline covering patches, vulnerabilities, IOCs, HAFNIUM, Huntress, FireEye, Mandiant, Veloxity & more. Recently, Hafnium has engaged in a number of attacks using previously unknown exploits targeting on-premises Exchange Server software. A surge of breaches against Microsoft Exchange Server appear to have rolled out in phases, with signs also pointing to other hackers using the same vulnerabilities after …
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