Ravindra BagaleCourses & study guides

39. Malware Threats

39.2 How Malware Spreads

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Malware gharat yesayche common raste (Maharashtra SMB pan same pattern):

  1. Phishing email / WhatsApp link – fake invoice, "Courier delivery", "IT password reset"
  2. Drive-by – compromised / shady website silently drops payload (often via browser/plugin bugs)
  3. USB / removable media – autorun or user double-clicks salary_sheet.exe disguised as folder
  4. Supply chain – trusted update / vendor software already poisoned (rare but high impact)
  5. Cracked / pirated software – keygens and "full version" zip = trojan cafe
  6. Office macros – .docm / .xlsm "Enable Content" → script downloads payload

Lab awareness: tumhi phishing template awareness class madhe dakhavu shakta – pan real malware link click nako, real payload host var save nako.

Red team (attacker) does Blue team (defender) detects / stops
Sends invoice-themed phishing with macro or link Email filtering, attachment sandbox, disable macros by default, user reporting button
Leaves infected USB in parking (classic bait) Disable autorun; USB allowlisting / control; endpoint alerts on new removable media executables
Trojans cracked software on file-share sites Block unknown publishers; company software portal only; hash allowlists

Ravindra Bagale's Tip

Students "main careful aahe" mhantat ani personal Chrome var cracked plugin lavtat. One weak home PC + reused password = office risk. Company rule: software only from IT portal. Ghabru naka – habit change = bachav.

Practice task

Raja-Rani Traders (Nashik) sathi 8-line user awareness notice Marathi+English mix: macros, USB, cracked apps, phishing. Mag Red vs Blue table madhun 3 spread methods pick karun "control + how we verify" column bhara.

Real incident: Emotet campaigns (public reporting)

Emotet was widely reported as a malware distribution botnet that often arrived via malicious Office documents and links, then dropped further payloads (including ransomware affiliates in later waves – per public vendor/CERT reporting). Weakness theme: macros + user click + weak email controls. Defence: block macros from internet, advanced email filtering, EDR, rapid isolation. Source: CERT-In / CISA / major vendor Emotet advisories (verify).