Hong Kong residents targeted in malvertising campaigns for WhatsApp, Telegram

Malvertising is a powerful malware or scam delivery mechanism that makes it easy to target specific geographies or even users. A recent article from the South China Morning Post discussed an increase in malicious webpages for the popular WhatsApp communication tool, driven via malicious Google ad...

Quasar RAT Utilizes DLL Side-Loading to Evade Detection

Threat Level Attack Report For a detailed threat advisory, download the pdf file here Summary Quasar RAT is an open-source remote access trojan that has been used by cybercriminals and threat actors for various malicious purposes. The use of DLL side-loading is a sophisticated technique that allo...

Attacks on web applications spike in third quarter, new Talos IR data shows

Quarterly threat report: Telecommunications and education are most-targeted verticals There was a notable increase in threats to web applications, accounting for 30 percent of the engagements Cisco Talos Incident Response Talos IR responded to in the third quarter of 2023, compared to 8 percent t...

Exploit for Insufficient Verification of Data Authenticity in Rarlab Winrar

CVE-2023-38831 CVE-2023-38831 is an RCE in WinRAR 6.23...

Quasar RAT Leverages DLL Side-Loading to Fly Under the Radar

The open-source remote access trojan known as Quasar RAT has been observed leveraging DLL side-loading to fly under the radar and stealthily siphon data from compromised Windows hosts. "This technique capitalizes on the inherent trust these files command within the Windows environment," Uptycs...

Okta's Support System Breach Exposes Customer Data to Unidentified Threat Actors

Identity services provider Okta on Friday disclosed a new security incident that allowed unidentified threat actors to leverage stolen credentials to access its support case management system. "The threat actor was able to view files uploaded by certain Okta customers as part of recent support...

Vietnamese Hackers Target U.K., U.S., and India with DarkGate Malware

Attacks leveraging the DarkGate commodity malware targeting entities in the U.K., the U.S., and India have been linked to Vietnamese actors associated with the use of the infamous Ducktail stealer. "The overlap of tools and campaigns is very likely due to the effects of a cybercrime marketplace,"...

North Korean Actors Behind Active Exploitation of TeamCity Vulnerability

Threat Level Attack Report For a detailed threat advisory, download the pdf file here Summary The North Korean threat actors Lazarus and its subgroup Andariel are actively exploiting the CVE-2023-42793 vulnerability, which is an authentication bypass vulnerability, after successful exploitation, ...

More helpful resources for users of all skill levels to help you Take a Security Action

Welcome to this weeks edition of the Threat Source newsletter. I continue to be saddened by all the conflict in Israel and Gaza thats still ongoing. Ill be back with a "normal" newsletter next week, as unfortunately, there doesnt seem to be a peaceful solution coming any time soon. In the meantim...

Google TAG Detects State-Backed Threat Actors Exploiting WinRAR Flaw

A number of state-back threat actors from Russia and China have been observed exploiting a recent security flaw in the WinRAR archiver tool for Windows as part of their operations. The vulnerability in question is CVE-2023-38831 CVSS score: 7.8, which allows attackers to execute arbitrary code wh...

Multiple North Korean threat actors exploiting the TeamCity CVE-2023-42793 vulnerability

Since early October 2023, Microsoft has observed two North Korean nation-state threat actors – Diamond Sleet and Onyx Sleet – exploiting CVE-2023-42793, a remote-code execution vulnerability affecting multiple versions of JetBrains TeamCity server. TeamCity is a continuous integration/continuous...

APT trends report Q3 2023

For more than six years, the Global Research and Analysis Team GReAT at Kaspersky has been publishing quarterly summaries of advanced persistent threat APT activity. These summaries are based on our threat intelligence research; and they provide a representative snapshot of what we have published...

CVE-2023-4215

Advantech WebAccess version 9.1.3 contains an exposure of sensitive information to an unauthorized actor vulnerability that could leak user credentials...

Threat Actors Exploit Atlassian Confluence CVE-2023-22515 for Initial Access to Networks

SUMMARY The Cybersecurity and Infrastructure Security Agency CISA, Federal Bureau of Investigation FBI, and Multi-State Information Sharing and Analysis Center MS-ISAC are releasing this joint Cybersecurity Advisory CSA in response to the active exploitation of CVE-2023-22515. This recently...

The forgotten malvertising campaign

In recent weeks, we have noted an increase in malvertising campaigns via Google searches. Several of the threat actors we are tracking have improved their techniques to evade detection throughout the delivery chain. We believe this evolution will have a real world impact among corporate users...

Discord, I Want to Play a Game

Discord, I Want to Play a Game By Ernesto Fernández Provecho and David Pastor Sanz Threatray · October 16, 2023 Discord is the first choice for gamers when they want to chat with some friends while playing an online computer game. Moreover, it is also a major choice for users that simply want to...

Beware: Lumma Stealer Distributed via Discord CDN

This blog discusses how threat actors abuse Discord’s content delivery network CDN to host and spread Lumma Stealer, and talks about added capabilities to the information stealing malware...

China’s Cyber Espionage Targets Semiconductor Giants in East Asia

Threat Level Attack Report For a detailed threat advisory, download the pdf file here Summary In recent cyber espionage activities, threat actors affiliated with the Peoples Republic of China PRC have targeted semiconductor companies operating in Mandarin/Chinese-speaking regions of East Asia...

CISA Warns of Actively Exploited Adobe Acrobat Reader Vulnerability

The U.S. Cybersecurity and Infrastructure Security Agency CISA on Tuesday added a high-severity flaw in Adobe Acrobat Reader to its Known Exploited Vulnerabilities KEV catalog, citing evidence of active exploitation. Tracked as CVE-2023-21608 CVSS score: 7.8, the vulnerability has been described ...

Fortinet Releases Security Updates for Multiple Products

Fortinet has released security advisories addressing vulnerabilities in multiple products. These vulnerabilities may allow cyber threat actors to take control of the affected systems. CISA encourages users and administrators to review the following Fortinet security advisories and apply the...