Russian government-connected hackers compromised two defense firms and a law enforcement agency in North Atlantic Treaty Organization countries as part of an espionage campaign, Symantec researchers said in a blog post Tuesday.

The infamous group behind hacks of the Democratic National Committee during the 2016 election cycle was behind the attacks that Symantec identified in recent months: Swallowtail, also known as APT28, Fancy Bear and Forest Blizzard, notorious for its links to the Russian military agency GRU.

The hackers apparently chose the targets of their attacks carefully, including a naval shipbuilder, a manufacturer of military aircraft engines and the law enforcement agency. In the attack on the shipbuilder, Symantec saw “hands-on-keyboard” activity as the hackers repeatedly returned to a compromised host over the course of a week to steal credentialed material.

“Hands-on-keyboard activity means a human operator is choosing what to do next, rather than malware running a fixed routine,” Dick O’Brien, principal intelligence analyst at the Symantec Threat Hunter Team, told CyberScoop. “It’s essentially confirmation that the organization is a genuine target for the operators, not an accidental infection. It also confirms that further exploitation beyond the initial infection was at least attempted.”

O’Brien said the campaign reflected broader intelligence collection aimed at European government and defense targets, but its motive wasn’t certain. He speculated that it could have been part of campaigns to target nations aiding Ukraine in its war against Russia.

The hackers made use of the Hookedge backdoor first identified in August by Recorded Future’s Insikt Group. That firm saw attacks dating back to September of last year by the same group using the same backdoor on defense and diplomatic targets in Romania, Spain and Turkey.

Symantec also observed the hackers deploying a previously undocumented loader.

“What surprised us was that the attackers then moved their most sensitive follow-up activity onto a dedicated server, when Recorded Future had expected them to keep hopping between free services,” O’Brien said. “The loader, ld.exe, hadn’t been publicly documented. It decrypts its payload in memory, and it needs a key supplied only at runtime on the command line. Without both the encrypted file and the key, the payload can’t be recovered. We didn’t recover it, so we don’t know its function.”

This spring, researchers and U.S. government agencies said they quashed a Forest Blizzard espionage campaign. Western governments warned last year about the group targeting companies supporting Ukraine.

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The ransomware-as-a-service group Medusa has adopted fresh tactics to gain access and added hundreds of victims in a little more than a year, according to an updated U.S. government advisory published Tuesday.

The gang is relying on access brokers,compensating them anywhere from $100 to $1 million, with higher prices going to those who work exclusively with Medusa. However, most of the brokers work simultaneously for “multiple variants at the same time,” the advisory from the Cybersecurity and Infrastructure Security Agency, FBI and Health and Human Services Department states in one of the updated portions of the advisory.

Tuesday’s update advisory expands upon aMarch 2025 advisory, drawing on ongoing FBI investigations.nIt includes information on the kinds of software vulnerabilities Medusa has exploited, such as Fortra GoAnywhere and BeyondTrust flaws.

“Medusa actors operate opportunistically by targeting victims with unpatched software rather than focusing on specific organizations or sectors; however, the Healthcare and Public Health (HPH) Sector has been a frequent victim of Medusa operations,” according to the advisory. “Medusa actors leverage newly announced exploits within 24 hours and have been observed to use exploits up to a week before public vulnerability disclosure.’

“However, there is no indication Medusa actors develop their own zero-day or N-day vulnerabilities, preferring instead to obtain advanced access to exploits from unknown sources or to quickly leverage newly announced exploits before potential victims can mitigate vulnerabilities through patching,” the advisory continues.

The approach appears to be netting gains: From March 2025 to April of this year, the victim tally in the advisory jumped from more than 300 to more than 500. The group was first identified in 2021.

“Medusa actors often use legitimate tools and living off the land techniques to evade detection. They may also leverage remote monitoring and management software and remote access services, including Remote Desktop Protocol, for lateral movement,” as updated sections of the advisory detail. “Once inside a network, they use common utilities and tools to support credential access, data exfiltration, and ransomware deployment.”

Earlier this year, Microsoft detailed how a group it dubbed Storm-1175 was making use of Medusa ransomware in speedy operations. Symantec and Carbon Black also detailed earlier this year how North Korean hackers were leaning on Medusa to target the health care sector.

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Joff Thyer // If you have been penetration testing a while, you likely have ended up in a Red Team situation or will be engaged in it soon enough. From […]

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