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September 22, 2023
Severity High Analysis Summary Ducktail Malware is a malicious program designed by hackers to infiltrate computers and networks globally. Ducktail malware is typically delivered through a […]September 22, 2023Severity Medium Analysis Summary First discovered in 2016, Revenge RAT is a remote access trojan (RAT) designed to give an attacker complete control over an infected […]September 22, 2023Severity High Analysis Summary The Konni APT (Advanced Persistent Threat) group is a cyber espionage group that has been active since at least 2014. It is […]Threat Insights
Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.
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Platform
Managed Security Services
Managed Penetration Testing
Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.
Resources
September 22, 2023Severity High Analysis Summary Ducktail Malware is a malicious program designed by hackers to infiltrate computers and networks globally. Ducktail malware is typically delivered through a […]September 22, 2023Severity Medium Analysis Summary First discovered in 2016, Revenge RAT is a remote access trojan (RAT) designed to give an attacker complete control over an infected […]September 22, 2023Severity High Analysis Summary The Konni APT (Advanced Persistent Threat) group is a cyber espionage group that has been active since at least 2014. It is […]Threat Insights
Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.
Connect with Us
Rewterz Threat Alert – Large Email Extortion Campaign
April 10, 2020Rewterz Threat Alert – Funds on Hold – Phishing Attack Targeting Banking Credentials
April 10, 2020
Severity
Medium
Analysis Summary
The Zoom Windows client is vulnerable to UNC path injection in the client’s chat feature that could allow attackers to steal the Windows credentials of users who click on the link. On the Zoom client, when a chat message is sent using the chat interface, any URLs that are sent are converted into hyperlinks so that other members can click on them to open a web page in their default browser. The vulnerability is that the Zoom client will convert Windows networking UNC paths into a clickable link in the chat messages as well. If a user clicks on a UNC path link, Windows will attempt to connect to the remote site using the SMB file-sharing protocol to open the remote file. When doing this, by default Windows will send the user’s login name and their NTLM password hash, which can be cracked using free tools like Hashcat to dehash, or reveal, the user’s password. Researchers tested the UNC injection in Zoom and obtained the NTLM password hashes being sent to a server hosting the clicked on share.
With the current power of our graphics cards and CPUs, a program like Hashcat can dehash passwords quickly. For example, the below hash for a fairly easy password was dehashed in just 16 seconds.
The UNC injects can also be used to launch programs on a local computer when a link is clicked. For example, clicking on a UNC path like \\127.0.0.1\C$\windows\system32\calc.exe will attempt to launch the Windows Calculator executable on the computer. Thankfully, Windows will prompt the user to allow the program to run before the program is executed.
Impact
Credential Leakage
Remediation
Earlier, we shared workarounds for this issue, but now Zoom has fixed this issue. Update to latest version.  |