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Today β€” 29 October 2026KnowBe4 Security
Before yesterdayKnowBe4 Security

Attackers Abuse Legitimate Infrastructure to Distribute Phishing Emails

27 October 2026 at 12:00

Researchers at Cisco Talos are tracking a significant increase in phishing campaigns that abuse legitimate platforms. Attackers abused more than 25 legitimate services over the past year, including β€œcollaboration, productivity, file-sharing, survey, payment and AI-related platforms.”

In two campaigns, attackers used order notifications from Staples and Dell to distribute phishing messages. The organizations themselves were not compromised, but the threat actors inserted phishing content into the fields that were supposed to contain shipping information.

Warning: Attackers Are Tricking Employees Into Sharing Malicious Calendar Invites

7 October 2026 at 09:00

Researchers at Fortra are tracking a new variant of calendar phishing in which threat actors trick employees into sharing meeting links internally.

The attackers pose as prospective customers and contact non-sales employees, asking to be directed to a sales representative in order to discuss a business opportunity. The attacker then sends the employee a meeting link to forward to a sales contact.

Warning: Tech Support Scams Are Abusing Google Ads

6 October 2026 at 12:00

Researchers at Netskope are tracking a phishing kit that hijacks users’ browser windows to display fake security alerts. The malicious websites are distributed via Google Ads, and pose as normal online stores. Once a user clicks a link on the page, however, the site will present them with an urgent-looking security warning.

Threat Actors Abuse Trusted Accounts and Internal Tools to Launch Convincing BEC Attacks

5 October 2026 at 16:00

Attackers are continually finding new ways to refine business email compromise (BEC) attacks, according to Douglas McKee, Director of Vulnerability Intelligence at Rapid7.

When attackers compromise trusted tools and accounts, they can manipulate victims’ view of reality. One way attackers can achieve this is through what McKee calls β€œcalendar warfare,” in which attackers use calendar meetings to trick users into falling for attacks.

Warning: New Phishing Kit Targets Hundreds of Organizations

16 September 2026 at 09:00

Attackers have used a new phishing platform called β€œBigBear 2.0” to target hundreds of organizations across more than forty countries, according to researchers at CloudSEK. In about 10% of cases, the phishing attacks were able to bypass multifactor authentication.

Phishing Emails Use New Technique to Bypass Microsoft 365 Security Filters

15 September 2026 at 12:00

Threat actors are using phishing emails with blank SMTP sender fields to bypass Microsoft 365 security filters, according to researchers at ReliaQuest.

Microsoft 365 Exchange Online uses a feature called β€œRejectDirectSend” to block unauthenticated Direct Send emails from an organization’s trusted domain. If an attacker omits the domain field from these emails, however, RejectDirectSend will no longer block the messages. Attackers can therefore exploit this technique to impersonate internal users.

Social Engineering Campaign Uses Phony NDAs to Avoid Detection

14 September 2026 at 12:00

Researchers at Gen Digital are tracking a sophisticated social engineering campaign that’s using phony NDA documents to trick employees into moving the conversation to WhatsApp and personal email accounts. The attackers targeted an employee at Gen itself, but the employee recognized that it was a scam and played along to see what the attackers would do.

Warning: β€œSlop Squatting” Directs AI Users to Phishing Pages

14 September 2026 at 09:00

Threat actors are increasingly leveraging AI hallucinations to plant phishing links and other malicious content in AI output, IEEE Spectrum reports. Large language models (LLMs) sometimes fabricate information, including web domains, when answering users’ questions. Attackers are registering these hallucinated web domains to host phishing pages.

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