How Hackers Become Admin (they just ask)

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Summary: The Nightshade C2 malware employs a "UAC prompt bombing" technique that relentlessly bombards users with administrator privilege requests until they grant access, effectively forcing privilege escalation 1:14-1:49. This attack exploits user frustration and system paralysis to achieve execution with elevated rights.

Key Takeaways:
• Loop Trap: The technique traps users in an endless UAC prompt loop, rendering their computer unusable until admin privileges are approved 2:44-2:53
• Exit Code Mechanism: Malware checks PowerShell exit codes ($?); a non-zero result (user denial) triggers the prompt loop to repeat 2:15-2:24
• PowerShell Implementation: The technique was recreated in PowerShell using a single-line command leveraging try/catch blocks and error handling to force persistent UAC prompts 3:23-3:30, 7:15-8:05
• Social Engineering: Attackers disguise prompts using legitimate Windows binaries (e.g., pcalua.exe, wlrmdr.exe) to appear trustworthy and evade suspicion 19:19-19:36
• Sandbox Evasion: The technique doubles as sandbox evasion—when antivirus services are disabled in analysis environments, the malware gets stuck in an infinite loop, thwarting dynamic analysis 23:02-23:37

UAC prompt bombing coerces users into granting admin privileges through psychological and technical pressure, enabling malware execution while simultaneously evading security analysis 15:09-16:03.

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