Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Threat Intelligence

10/9/2020
02:15 PM
50%
50%

Critical Zerologon Flaw Exploited in TA505 Attacks

Microsoft reports a new campaign leveraging the critical Zerologon vulnerability just days after nation-state group Mercury was seen using the flaw.

Microsoft has observed new threat activity exploiting the critical Zerologon vulnerability (CVE-2020-1472. The campaign poses as software updates that connect with known TA505 command-and-control infrastructure, the company reports.

Related Content:

6 Things to Know About the Microsoft 'Zerologon' Flaw

2020 State of Cybersecurity Operations and Incident Response

New on The Edge: Emotet 101: How the Ransomware Works -- and Why It's So Darn Effective

TA505 is a Russian-speaking threat group known for spreading the Dridex banking Trojan and Locky ransomware. While its victim organizations span sizes and industries, it's known to target financial organizations and use a range of attack techniques to achieve its nefarious goals.

This time it's weaponizing Zerologon, a vulnerability that has become a patching priority since Microsoft released one of two planned fixes in August. The flaw exists when an attacker creates a vulnerable Netlogon secure channel connection to a domain controller using MS-NRPC. With this, they don't need to authenticate in order to elevate privileges and become an admin. 

TA505, which Microsoft calls Chimborazo, is distributing fake updates that lead to UAC bypass and using wscript[.]exe to run malicious code. To exploit this vulnerability, the attackers abuse MSBuild[.]exe to compile Mimikatz updated with built-in Microsoft functionality, the company's security intelligence team explains in a series of tweets on their discovery.

"Attacks showing up in commodity malware like those used by the threat actor Chimborazo indicate broader exploitation in the near term," says Microsoft, encouraging readers to update.

This is the second time this week attackers were seen using Zerologon in the wild. Mercury, an Iranian APT group also known as MuddyWater, Static Kitten, and Seedworm, has been using the vulnerability in active campaigns over the past two weeks, Microsoft Security Intelligence found. Mercury has historically targeted government organizations, especially those in the Middle East.

Read more details here.

Dark Reading's Quick Hits delivers a brief synopsis and summary of the significance of breaking news events. For more information from the original source of the news item, please follow the link provided in this article. View Full Bio
 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Commentary
How SolarWinds Busted Up Our Assumptions About Code Signing
Dr. Jethro Beekman, Technical Director,  3/3/2021
News
'ObliqueRAT' Now Hides Behind Images on Compromised Websites
Jai Vijayan, Contributing Writer,  3/2/2021
News
Attackers Turn Struggling Software Projects Into Trojan Horses
Robert Lemos, Contributing Writer,  2/26/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win an Amazon Gift Card! Click Here
Latest Comment: Sure you have fire, but he has an i7!
Current Issue
2021 Top Enterprise IT Trends
We've identified the key trends that are poised to impact the IT landscape in 2021. Find out why they're important and how they will affect you today!
Flash Poll
How Enterprises are Developing Secure Applications
How Enterprises are Developing Secure Applications
Recent breaches of third-party apps are driving many organizations to think harder about the security of their off-the-shelf software as they continue to move left in secure software development practices.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2021-27314
PUBLISHED: 2021-03-05
SQL injection in admin.php in doctor appointment system 1.0 allows an unauthenticated attacker to insert malicious SQL queries via username parameter at login page.
CVE-2019-18630
PUBLISHED: 2021-03-04
On Xerox AltaLink B8045/B8055/B8065/B8075/B8090 and C8030/C8035/C8045/C8055/C8070 multifunction printers with software releases before 101.00x.099.28200, portions of the drive containing executable code were not encrypted thus leaving it open to potential cryptographic information disclosure.
CVE-2021-25344
PUBLISHED: 2021-03-04
Missing permission check in knox_custom service prior to SMR Mar-2021 Release 1 allows attackers to gain access to device's serial number without permission.
CVE-2021-25345
PUBLISHED: 2021-03-04
Graphic format mismatch while converting video format in hwcomposer prior to SMR Mar-2021 Release 1 results in kernel panic due to unsupported format.
CVE-2021-25346
PUBLISHED: 2021-03-04
A possible arbitrary memory overwrite vulnerabilities in quram library version prior to SMR Jan-2021 Release 1 allow arbitrary code execution.