Cybersecurity Threats

Using entropy to spot the malware hiding in plain sight

Shyam Sundar Ramaswami
November 17, 2020 • 4 minute read
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As malware and spam become more automated and complex, "word entropy" can help defenders spot malware and exfiltration in steganography and hidden macros.

Healthcare industry under threat of trojan and ransomware attacks

Austin McBride
November 10, 2020 • 4 minute read
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The healthcare industry is particularly vulnerable to cyberattacks. Get the latest about new trojan and ransomware attacks on hospitals.

Cisco Umbrella protects against SIGRed, CVE-2020-1350

Robbie Grue
July 17, 2020 • 4 minute read
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Any customers of Cisco Umbrella who have configured their Microsoft DNS servers to forward to our resolvers are protected against SIGRed (CVE-2020-1350)

Cybersecurity threats, network complexity, and inefficient tools drive change in 2020

Negisa Taymourian
Updated — June 30, 2020 • 3 minute read
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In ESG’s new Elastic Cloud Gateway report, learn about the impacts that cloud, mobility, and distributed environments have on edge network security strategy

Inadequate security makes WordPress sites a land of opportunity for hackers

Sreenidhi Ramadurgam
Updated — June 30, 2020 • 5 minute read
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Cisco Umbrella threat researchers have been analyzing attacks on WordPress sites and found some interesting examples of how attackers are compromising them

Working at Home? How to Protect Against Phishing During a Pandemic with Cisco Umbrella and OpenDNS

Negisa Taymourian
Updated — June 8, 2023 • 3 minute read
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Get phishing tips to protect yourself and learn how Cisco Umbrella and OpenDNS stop pandemic-themed phishing attacks.

Navigating Cybersecurity During a Pandemic: Latest Malware and Threat Actors

Andrea Kaiser and Shyam Sundar Ramaswami
Updated — July 1, 2020 • 6 minute read
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In this blog post, we discuss how threat actors are using the pandemic in malicious campaigns, and the increase in Internet requests related to this crisis

Cybersecurity Terms and Threats You Need to Know in 2020

Lorraine Bellon
Updated — December 13, 2021 • 8 minute read
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In this blog post, Cisco Umbrella defines the key cybersecurity terms and threats that everyone should know in 2020 and beyond.

How to Defend Against Ransomware

Rachel Ackerly
Updated — July 1, 2020 • 3 minute read
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The 2nd Edition Ransomware Defense For Dummies eBook is freshly revised with the latest trends and techniques for stopping ransomware attacks in 2020 & beyond

Obfuscation: The Abracadabra of Malware Authors

Shyam Sundar Ramaswami, Sreenidhi Ramadurgam, and Sneha Shekar
Updated — September 26, 2023 • 7 minute read
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In this blog post, we’re going to run through an analysis we did of a file that was hosted at a Dropbox shared link that turned out to use some pretty interesting techniques in order to hide the real intentions of the file.