Security Issue Remediation — 220-1202 Study Guide

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Trait	Rogue AV / scareware	Real antivirus detection	Browser certificate warning
Where it comes from	A web pop-up or injected page	Your installed endpoint protection	The browser's TLS certificate check
Typical wording	'Your PC is infected, call/pay now'	Threat found and quarantined	'Your connection is not private', cert error
What it really means	Social engineering; no real scan ran	A genuine detection to act on	Cert expired, self-signed, name mismatch, or interception
Right first response	Close via Task Manager; never call or pay	Let it quarantine, then verify and rescan	Check the clock and cert; do not bypass on a login site
Escalate to structured removal?	Only if a payload actually ran	Yes if detections keep returning	No, unless paired with hosts or proxy tampering

Cheat sheet

Match the remediation to the symptom, not your worst fear
Treat a pay-or-call infection pop-up as scareware, not a scan
Tell a real antivirus alert from scareware by its source
A browser hijacker reroutes traffic by rewriting your defaults
The hosts file overrides DNS, so malware edits it to redirect you
A rogue proxy or DNS setting redirects every browser at once
A certificate warning names its reason, so read it before reacting
Judge a certificate warning by the site it appears on
A disabled Task Manager or regedit is a symptom, not a glitch
An unexpected UAC prompt, or UAC switched off, is a red flag
Trace a rogue process by its odd path and idle-time network use
Repeated lockouts point at a replayed credential, so reset it
Run the browser remediation steps in order so no redirect survives
Sign out of sync before resetting, or the hijacker returns
Reset exposed passwords from a device you know is clean
Reinstall only from trusted, secure sources to stop reinfection
Match the fix to the scope: one site gets the pop-up blocker
Persistence or spread escalates to removal, quarantine first
Microsoft Safety Scanner expires ten days after you download it
A yellow Windows Security status is a recommendation; a red X means protection is off

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Cheat sheet