article thumbnail

NSA, CISA issue guidance on Protective DNS services

SC Magazine

A PDNS service uses existing DNS protocols and architecture to analyze DNS queries and mitigate threats. A PDNS can log and save suspicious queries and provide a blocked response, delaying or preventing malicious actions – such as ransomware locking victim files – while letting organizations investigate using those logged DNS queries.

DNS 131
article thumbnail

GUEST ESSAY: Addressing DNS, domain names and Certificates to improve security postures

The Last Watchdog

In 2019, we’ve seen a surge in domain name service (DNS) hijacking attempts and have relayed warnings from the U.S. Our most recent Domain Name Security report featuring insights from the defense, media, and financial sectors illustrates the risk trends. •Do Cybersecurity and Infrastructure Agency, U.K.’s

DNS 182
Insiders

Sign Up for our Newsletter

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

article thumbnail

Sunburst: connecting the dots in the DNS requests

SecureList

In the initial phases, the Sunburst malware talks to the C&C server by sending encoded DNS requests. These requests contain information about the infected computer; if the attackers deem it interesting enough, the DNS response includes a CNAME record pointing to a second level C&C server. avsvmcloud[.]com” avsvmcloud[.]com”

DNS 75
article thumbnail

GUEST ESSAY: A full checklist on how to spot pharming attacks — and avoid becoming a victim

The Last Watchdog

The Pharming attacks are carried out by modifying the settings on the victim’s system or compromising the DNS server. Manipulating the Domain Name Service (DNS) protocol and rerouting the victim from its intended web address to the fake web address can be done in the following two ways: •Changing the Local Host file.

DNS 214
article thumbnail

Experts spotted a new sophisticated malware toolkit called Decoy Dog

Security Affairs

While analyzing billions of DNS records, Infoblox researchers discovered a sophisticated malware toolkit, dubbed Decoy Dog, that was employed in attacks aimed at enterprise networks. The researchers pointed out that while the malware is open source, deploying it as a DNS C2 requires a significant effort.

Malware 88
article thumbnail

April’s Patch Tuesday Brings Record Number of Fixes

Krebs on Security

Microsoft today released updates to address 147 security holes in Windows, Office , Azure ,NET Framework , Visual Studio , SQL Server , DNS Server , Windows Defender , Bitlocker , and Windows Secure Boot. Yes, you read that right. “As far as I can tell, it’s the largest Patch Tuesday release from Microsoft of all time.”

DNS 243
article thumbnail

Sea Turtle Hackers Spy on Dutch ISPs and Telecommunication Companies

Heimadal Security

Sea Turtle Turkish state-backed group changed to focus on internet service providers (ISPs), telcos, media, and Kurdish websites. DNS hijacking and traffic redirection that leads to man-in-the-middle attacks are among their cyber espionage techniques.