A newly identified ransomware strain named Cephalus has emerged as a sophisticated threat, targeting organizations through compromised Remote Desktop Protocol (RDP) connections.<\/p>\n
The malware, which takes its name from Greek mythology referencing the son of Hermes who tragically killed his wife with an infallible javelin, represents a concerning evolution in ransomware deployment techniques.<\/p>\n
Cephalus distinguishes itself from other ransomware families through its unique infection methodology and sophisticated evasion tactics.<\/p>\n
The malware operators gain initial access to target networks by exploiting RDP credentials that lack multi-factor authentication<\/a> (MFA), a vulnerability that continues to plague organizations worldwide.<\/p>\n Once inside the network, attackers utilize the MEGA cloud storage platform for data exfiltration<\/a> before deploying the ransomware payload.<\/p>\n The ransomware deployment mechanism involves a particularly clever approach using DLL sideloading through legitimate security software components.<\/p>\n Huntress analysts identified<\/a> this technique during investigations of two separate incidents occurring on August 13 and August 16, 2025, where the malware successfully infiltrated organizations running legitimate SentinelOne security products.<\/p>\n The most technically intriguing aspect of Cephalus lies in its deployment strategy, which exploits a legitimate SentinelOne executable file called The ransomware operators place this legitimate binary in the user\u2019s Downloads folder, from where it loads a malicious DLL named This DLL subsequently loads a file called Upon successful execution, Cephalus immediately begins system recovery prevention by running embedded commands.<\/p>\n The first command executed is The malware then systematically disables Windows Defender<\/a> through a series of PowerShell commands that create exclusions for critical system processes and file extensions including .cache, .tmp, .dat, and .sss files.<\/p>\n The ransomware further modifies Windows Registry entries to disable real-time protection, behavior monitoring, and on-access protection features.<\/p>\n It stops and disables Windows Defender services including SecurityHealthService, Sense, WinDefend, and WdNisSvc through PowerShell commands executed with hidden window styles and bypassed execution policies.<\/p>\n Cephalus ransom notes contain a unique characteristic \u2013 they reference news articles about previous successful attacks, attempting to establish credibility and create urgency for victims.<\/p>\n The malware encrypts files with the .sss extension and creates recover.txt files containing payment instructions.<\/p>\n Organizations can protect themselves by implementing MFA for RDP access, monitoring for unauthorized use of legitimate security tool executables in unusual locations, and maintaining comprehensive endpoint detection capabilities.<\/p>\n The post New Cephalus Ransomware Leverages Remote Desktop Protocol to Gain Initial Access<\/a> appeared first on Cyber Security News<\/a>.<\/p>\n<\/div>\n![\"\"](\"https:\/\/i0.wp.com\/blogger.googleusercontent.com\/img\/b\/R29vZ2xl\/AVvXsEgleYYCid-8U54o99dxBd15cr0NDt0Xs5OMFQFGs9i0irStabCc47fSSVqnnNnmEoFssQSM7yeYTkcUZ6VAPrmAlvihte9XALbUuGy18szlI5fs-SQUGEkS7gqxa_USLyA4E422k4CarHAXqF_H-O7o1vJTFtInATzutYHWGSlRYJOLoKPubZ_hNs0loKw\/s16000\/Process%2520lineage%2520showing%2520use%2520of%2520MEGA%2520%28Source%2520-%2520Huntress%29.webp?ssl=1\")
DLL Sideloading and Execution Chain<\/strong><\/h2>\n
SentinelBrowserNativeHost.exe<\/code>.<\/p>\nSentinelAgentCore.dll<\/code>.<\/p>\ndata.bin<\/code> containing the actual ransomware code, creating a multi-stage execution chain that helps evade detection.<\/p>\nvssadmin delete shadows \/all \/quiet<\/code>, which eliminates volume shadow copies that could be used for file recovery.<\/p>\n![\"\"](\"https:\/\/i0.wp.com\/blogger.googleusercontent.com\/img\/b\/R29vZ2xl\/AVvXsEggSpjfdMM7ms1jb0DtMIjrce4zBbXa190lshVM6uWcX861eTIHadR_pGbNzgULNKN2BTOY9EDOTgUkH0a5ZObqrV7q2a8AB93K8TPSp1b4-SQb8-Mj5oqRrfJQq7TmZqp2-4JZ0eyRZmocEWmC4TV5n8q9Ua24ZZyEU4AxdrBKcxDpMCw6O5cEd0DuAEw\/s16000\/Cephalus%2520ransom%2520note%2520posted%2520publicly%2520on%2520Twitter%2520%28Source%2520-%2520Huntress%29.webp?ssl=1\")
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