File Infector Viruses & Parasitic Malware

Threat Landscape & Operational Overview

File infectors (traditional computer viruses) operate parasitically by appending, prepending, or cavity-injecting their malicious code into legitimate executable files (.exe, .dll, .sys). When a user or system process executes an infected file, the virus code executes first—locating clean binaries across local drives and network shares to perpetuate the infection—before transferring execution back to the host program. Sophisticated polymorphic and metamorphic engines continuously mutate the virus decryptor stub, complicating static signature detection.

Primary MITRE ATT&CK Tactics & Techniques

Observed technical tradecraft, privilege escalation, and persistence patterns mapped across threat families in this category:

Actively Weaponized Exploits & Vulnerabilities (4 CVEs)

Adversaries deploying file infector viruses & parasitic malware frequently weaponize the following software vulnerabilities for initial ingress, privilege escalation, or lateral movement:

SOC Incident Containment Checklist

Standard operating triage procedure for security teams responding to suspicious or confirmed infections in this category:

1. Disconnect the affected host to prevent viral propagation across shared network storage.
2. Execute a full offline boot scan using an enterprise antivirus rescue environment to disinfect PE headers.
3. Identify whether the virus employs polymorphic techniques requiring specialized heuristic cleaners.
4. Restore infected system binaries from verified pristine backups or perform clean OS re-installation.
5. Audit all executable files on shared team drives to verify the infection has not spread laterally.

Prominent Malware Families in this Category

Top documented threats ranked by historical prevalence and behavioral signatures:

Complete Directory (20 Families)

Alphabetical index of all tracked malware families cataloged under file infector viruses & parasitic malware:

• aliser
• alman
• cia
• coma
• cyn
• dinwod
• expiro
• fujacks
• invader
• jeefo
• neshta
• parite
• pioneer
• sality
• sivis
• tenga
• viking
• virut
• xpaj
• yuner