The Scattered Spider ransomware group is infiltrating Slack and Microsoft Teams to target vulnerable employees

The Scattered Spider hacking group is on the move again, security agencies have warned, adding new ransomware and improved social engineering techniques to its repertoire.

In a joint international advisory, the FBI and other cybersecurity agencies said the group is now using DragonForce ransomware and other new variants, and is exploiting remote access tools such as AnyDesk to bypass security alerts.

The group has also started using a new social engineering technique, the advisory warned. While the group has been observed posing as IT help desk workers to target employees, it’s now impersonating employees to ask IT teams to reset passwords or transfer MFA tokens.

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This technique is used by the group to perform account takeovers in single sign-on (SSO) environments, the FBI noted.

Similarly, the group is also conducting ‘push bombing’ - repeatedly hitting the user with verification requests until one's finally accepted - and SIM swapping attacks, allowing them to intercept text messages containing one-time passwords.

Scattered Spider has also been spotted targeting corporate Snowflake accounts for initial network access and data theft.

Nick Tausek, lead security automation architect at Swimlane, said the new techniques employed by the ransomware outfit should “raise a lot of red flags” and urged enterprises to remain vigilant.

"Access to an organization’s Snowflake allows the group to run thousands of queries immediately and simultaneously, often deploying DragonForce malware to encrypt target organizations’ servers," he explained.

"The potential for vast amounts of stolen data explains why they’ve been successful across multiple industries, from insurance to transportation to retail."

Scattered Spider is infiltrating Teams and Slack

Notably, the FBI advisory warned Scattered Spider has also been infiltrating workplace collaboration platforms like Slack or Microsoft Teams to gather information which is then used in phishing attacks against employees.

Microsoft Exchange email accounts are also a top target for the group, agencies noted.

Reconnaissance on employees involves extensive research of a company website to gather information and “determine the individual’s role in a target organization”.

"These social engineering attempts are enriched by access to personal information derived from social media, open source information, commercial intelligence tools, and database leaks," the advisory added.

The hackers have even set up fake identities and taken part in company teleconferences and remediation and response calls to gather security information.

"Entering incident remediation and response calls undetected in order to identify how security teams are adapting to their attacks is a clever strategy to remain ahead," Tausek said.

"Listening in on these calls gives them access to information like how they’re being hunted, and what adjustments security teams will make to prevent future attacks."

Scattered Spider has been on a rampage

Scattered Spider is believed to have been responsible for a large wave of attacks in recent months, with victims including British retailers and insurance firms.

More recently, threat intelligence reports have suggested the group has turned its attention to the airline industry, which represents a lucrative source of potential victims.

Most targets have been in the UK and US, with Marks & Spencer (M&S), the Co-op, and Harrods all targeted by the ransomware gang.

The agencies advise organizations to keep a watchful eye for unauthorized account activity and 'risky logins' where sign-in attempts have been flagged as suspicious.

They should also maintain offline backups of sensitive data and store it separately from source systems. Similarly, they should focus on enforcing phishing-resistant multifactor authentication (MFA) and implementing application controls to manage software execution.

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