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- “Invisible Intrusions: Fileless & Living-off-the-Land Attacks”
“Invisible Intrusions: Fileless & Living-off-the-Land Attacks”
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Fileless Malware Operates Fully In-Memory to Evade Detection
No files are dropped on disk, avoiding traditional antivirus. Attackers use PowerShell, WMI, or LOLBins already present in the system. These actions are nearly invisible unless behavior analytics are in place.
Native OS Tools Are Weaponized for Malicious Persistence
Built-in commands like certutil, mshta, or regsvr32 are used to download or run payloads. Since they’re signed and trusted, they bypass many security controls. Monitoring their usage is critical for defense.
Registry and Scheduled Tasks Are Used for Stealthy Access
Attackers plant persistence hooks in obscure registry keys or create hidden scheduled tasks. These survive reboots and go unnoticed by most antivirus tools. Even forensic analysts often miss them during incident response.
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DLL Hijacking Exploits Application Loading Behaviors
Applications load DLLs based on search order, not integrity. Attackers drop malicious DLLs into expected directories. The app executes them unknowingly with its full privileges.
Reflective Code Injection Keeps Payloads Off Disk
Payloads are injected directly into memory of legitimate processes. This technique avoids writing any executable code to disk. Security tools must rely on in-memory analysis to detect such activity.
Exfiltration Happens Directly From RAM or Trusted Binaries
Sensitive data is collected and sent out using trusted system processes. Since no new binaries are used, traffic appears normal. Without deep packet inspection or EDR, exfiltration goes undetected.
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