HardBit 4.0 Ransomware Actors Attack Open RDP and SMB Services to Persist Access

Cybersecuritynews •Tushar Subhra Dutta • December 23, 2025

HardBit ransomware continues to evolve as a serious threat to organizations worldwide. The latest version, HardBit 4.0, emerged as an upgraded variant of a strain that has been active since 2022, bringing with it more advanced features and enhanced techniques to avoid detection. This newest iteration represents a significant step forward in the ransomware’s ability […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

HardBit 4.0 Ransomware Exploits Unsecured RDP and SMB Services HardBit 4.0 ransomware has emerged as a significant threat, utilizing unsecured RDP and SMB services to maintain access to compromised systems. This updated variant builds on a strain active since 2022, featuring advanced evasion techniques that enhance its ability to avoid detection. Organizations worldwide are at risk as this ransomware continues to evolve. 2 sources 37

HardBit 4.0 Ransomware Actors Attack Open RDP and SMB Services to Persist Access

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