Threat Actors Compromise Valid Accounts Via Social Engineering

Phishing remains a top initial access vector for cyberattacks, according to researchers at Cisco Talos. 

The researchers have published a report on threat trends in the third quarter of 2024, finding that attackers are increasingly targeting valid accounts to gain footholds within organizations.

“Talos IR observed AitM phishing attacks play out in a number of ways this quarter, where adversaries attempted to trick users into entering their credentials into fake login pages,” the researchers write. “In one engagement, Talos IR investigated a phishing case where, after clicking a malicious link in a phishing email, the victim was redirected to a site prompting them to enter their credentials, and subsequently approved an MFA request.

In another engagement, an initial phishing email redirected a user to a page that simulates a Microsoft O365 login and MFA portal, capturing the user’s credentials and subsequently logging in on their behalf. The first login by the adversary was seen 20 minutes after the initial phishing email, highlighting the speed, ease, and effectiveness of these operations.”

The researchers add that “once account compromise is achieved, an actor can carry out any number of malicious activities, including account creation, escalating privileges to gain access to more sensitive information, and launching social engineering attacks, like business email compromise (BEC), against other users on the network.”

Talos notes that many of these attacks could have been prevented by basic security best practices, such as implementing multi-factor authentication (MFA).

“We continue to see a significant number of compromises that could have been prevented with the presence of certain security fundamentals, like MFA and proper configuration of endpoint detection products,” the researchers write. “In nearly 40 percent of engagements, misconfigured MFA, lack of MFA, and MFA bypass accounted for the top observed security weaknesses this quarter.

Additionally, in 100 percent of the engagements that involved threat actors sending phishing emails to victims, MFA was bypassed or not fully enabled, while over 20 percent of incidents where ransomware was deployed did not have MFA enabled on VPNs.”

KnowBe4 empowers your workforce to make smarter security decisions every day. Over 70,000 organizations worldwide trust the KnowBe4 platform to strengthen their security culture and reduce human risk.

Cisco Talos has the story.

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