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Jim Walter

Jim Walter is a Senior Threat Researcher at SentinelOne focusing on evolving trends, actors, and tactics within the thriving ecosystem of cybercrime and crimeware. He specializes in the discovery and analysis of emerging cybercrime "services" and evolving communication channels leveraged by mid-level criminal organizations. Jim joined SentinelOne following ~4 years at a security start-up, also focused on malware research and organized crime. Previously, he spent over 17 years at McAfee/Intel running their Threat Intelligence and Advanced Threat Research teams.
CyberVolk Returns Ftr
labs

CyberVolk Returns | Flawed VolkLocker Brings New Features With Growing Pains

Jim Walter / December 11, 2025

Deep dive into CyberVolk’s new VolkLocker ransomware-as-a-service, its major design flaw, and what it signals for cyber defenders.

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Katz 2
labs

Katz Stealer | Powerful MaaS On the Prowl for Credentials and Crypto Assets

Jim Walter / July 17, 2025

A stealthy MaaS infostealer exfiltrating browser, crypto, and system data, Katz Stealer is enabling full campaign control for threat actors.

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Anti Ransomware Day 2025 10 Years Of RaaS And The Making Of A Billion Dollar Business
labs

Anti-Ransomware Day 2025: 10 Years of RaaS and the Making of a Billion-Dollar Business

Jim Walter / May 12, 2025

This Anti-Ransomware Day, we look at a decade of RaaS activity and how ransomware has evolved into a billion-dollar criminal enterprise.

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DragonForce Ransomware Gang From Hacktivists To High Street Extortionists
labs

DragonForce Ransomware Gang | From Hacktivists to High Street Extortionists

Jim Walter / May 2, 2025

DragonForce ransomware group is targeting major UK retailers. Learn about this evolving threat and what steps can be taken to mitigate risk.

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Dragon RaaS2
labs

Dragon RaaS | Pro-Russian Hacktivist Group Aims to Build on “The Five Families” Cybercrime Reputation

Jim Walter / March 19, 2025

Dragon RaaS is a ransomware group that walks the line between hacktivism and cybercrime targeting organizations in the US, UK, France and Germany.

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Hellcat Morpheus Ftr
labs

HellCat and Morpheus | Two Brands, One Payload as Ransomware Affiliates Drop Identical Code

Jim Walter / January 23, 2025

Analysis of payloads suggest affiliates may be using a shared codebase or common builder to deploy attacks under different RaaS brand names.

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Cybervolk V2 Ftr
labs
Crimeware

CyberVolk | A Deep Dive into the Hacktivists, Tools and Ransomware Fueling Pro-Russian Cyber Attacks

Jim Walter / November 25, 2024

A loose collective of mostly low-skilled actors, CyberVolk absorbs and adapts a wide array of destructive malware for use against political targets.

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Kryptina Desert Ftr
labs
Crimeware

Kryptina RaaS | From Unsellable Cast-Off to Enterprise Ransomware

Jim Walter / September 23, 2024

Kryptina's adoption by Mallox affiliates complicates malware tracking as ransomware operators blend different codebases into new variants.

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DeathGrip RaaS FTFL2
labs

DeathGrip RaaS | Small-Time Threat Actors Aim High With LockBit & Yashma Builders

Jim Walter / August 8, 2024

Learn about an emerging ransomware-as-a-service called DeathGrip and their use of LockBit and Yashma/Chaos-based payloads to deliver malware.

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NullBulge Ransomware Threat Actor Masquerades As Hacktivist Group Rebelling Against AI2
labs
Crimeware

NullBulge | Threat Actor Masquerades as Hacktivist Group Rebelling Against AI

Jim Walter / July 16, 2024

Actors are masquerading as hacktivists targeting AI-centric communities with commodity malware and customized LockBit payloads.

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SentinelLabs

In the era of interconnectivity, when markets, geographies, and jurisdictions merge in the melting pot of the digital domain, the perils of the threat ecosystem become unparalleled. Crimeware families achieve an unparalleled level of technical sophistication, APT groups are competing in fully-fledged cyber warfare, while once decentralized and scattered threat actors are forming adamant alliances of operating as elite corporate espionage teams.

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