Wapomi
Overview
Executive Summary
Wapomi is a destructive File Infector (parasitic virus) and worm that was highly prevalent in the late 2000s and early 2010s. Unlike modern Trojans that simply drop a payload, Wapomi physically alters existing executable files (`.exe`, `.dll`) on the infected host, appending its malicious code to them. Its primary objective is aggressive self-replication across local drives, network shares, and removable media, often causing widespread system corruption and instability.Infection Vector and Technical Capabilities
Wapomi spreads rapidly without requiring active human interaction once introduced to an environment. The initial infection usually occurs via an infected USB drive, a malicious email attachment, or by executing a file downloaded from an untrusted P2P network. Its technical core relies on aggressive modification and propagation:- Executable Appending (File Infection): When Wapomi runs, it aggressively scans the hard drive for executable files. It injects its malicious assembly code into the target file's PE (Portable Executable) header and entry point. When a user later runs the "clean" application, the virus executes first.
- Worm Propagation: Wapomi actively seeks out mapped network drives (SMB shares) and removable USB drives. It copies an infected executable to these drives and often creates an `autorun.inf` file, ensuring the virus automatically executes if the drive is plugged into another vulnerable machine.
- System Instability: Because file infection is a delicate, binary-level operation, Wapomi's aggressive appending often corrupts the target executables. This leads to frequent application crashes, system instability, and the inability to launch legitimate software.
Threat Assessment
A Wapomi infection is a highly disruptive event. While it may not explicitly steal data, its rapid propagation via network shares can quickly paralyze an entire corporate network, corrupting thousands of legitimate files and requiring massive remediation efforts.Incident Response and Remediation
- Immediate Network Severance: Infected machines must be isolated from the network *immediately* to halt the worm's spread across SMB shares. Disable USB port access across the organization temporarily via Group Policy.
- Aggressive File Disinfection: Standard file deletion is not an option, as it would destroy legitimate corporate applications. Enterprise antivirus must be utilized in "Disinfect" mode, attempting to carefully strip the viral code out of the infected executables and repair the original PE headers.
- Mass Restoration: In severe cases of widespread corruption, disinfection may fail. IT teams must be prepared to wipe infected machines and restore applications and user files from clean, offline backups.
Known aliases
Threat reports may refer to this family under multiple names:
MITRE ATT&CK Techniques
This family has been observed using the following ATT&CK techniques: T1091 T1055.009 T1105
Tactical Mitigations
Based on the techniques used by this family, consider the following defensive strategies:
- T1105: Implement network intrusion detection systems (NIDS) and host-based firewalls to block unauthorized inbound or outbound file transfers.
Generated Detections (Boilerplate)
These YARA and Sigma rules are auto-generated based on the family name and aliases. They must be heavily tuned before deployment in a production environment.
YARA Rule
rule MALWARE_WIN_WAPOMI {
meta:
description = "Detects Wapomi (worm_banker)"
author = "SystemHelpdesk Boilerplate Generator"
date = "2026-07-06"
strings:
$s1 = "wapomi" ascii wide nocase
$s2 = "virus.wapomi" ascii wide nocase
$s3 = "w32.wapomi" ascii wide nocase
$s4 = "pe_wapomi" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Sigma Rule
title: Suspicious Wapomi Activity
id: bf1e1be38d8cdfb39e70ec8f0a8856e9
status: experimental
description: Detects generic indicators of the wapomi malware family.
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
CommandLine|contains:
- "*wapomi*"
- "*virus.wapomi*"
- "*w32.wapomi*"
- "*pe_wapomi*"
condition: selection
level: mediumReferences & External Analysis
- Search "wapomi" on VirusTotal (External Analysis)
Frequently Asked Questions
Where can I learn more about wapomi?
Refer to the linked MITRE ATT&CK technique pages, which document the behaviors associated with this family.
How do I remove the Wapomi Worm_Banker from Windows?
Manual removal of Wapomi is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.
Is Wapomi a virus or a Worm_Banker?
Wapomi is classified as a Worm_Banker. Unlike traditional viruses that infect files, modern malware like Wapomi typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Wapomi infection?
Symptoms of Wapomi can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.
Related Families (Category: worm_banker)
Explore other malware families in the same category:
Protect Your Network Against Worm_Bankers
Want to prevent Wapomi and similar threats from compromising your organization? Read our comprehensive defensive guide: Worm & Virus Protection.
Machine-readable
Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/wapomi.json
Ecosystem & Interactive Environments
This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.