Vigram
Table of Contents
Overview
Adware/PUP:Win32/Vigram is a prevalent Potentially Unwanted Program (PUP) categorized as Adware. It is designed to monetize the user's web browsing activity without their explicit consent by forcefully injecting intrusive advertisements, pop-unders, and sponsored links directly into the webpages they visit. Vigram significantly degrades system performance and poses privacy risks by tracking browsing history.
Understanding Vigram (Adware)
To an end-user, Vigram is highly visible: web pages load slowly, words within articles are mysteriously hyperlinked to advertising sites, and unclosable pop-up ads appear constantly. For a security operations center (SOC), Vigram is an indicator of poor user hygiene and risky downloading behavior, serving as a potential gateway for more severe 'Drive-by Compromise' (`T1189`) attacks via malvertising.
Execution and Hijacking Mechanics
Vigram is typically distributed via deceptive software bundles (wrappers) on third-party freeware sites. Upon execution, it installs itself, often masquerading as a legitimate browser helper object (BHO) or extension (`T1176`). It intercepts HTTP/HTTPS traffic locally to inject its own ad scripts directly into the Document Object Model (DOM) of the webpage before the browser renders it. To ensure it remains active, Vigram establishes persistence via Scheduled Tasks (`T1053.005`) or Registry Run keys (`T1547.001`), frequently employing randomized file names to evade simple signature-based removal scripts.
Indicators of Compromise & Impact
The primary impact is a severe degradation of the user experience and exposure to potentially malicious ads. Host-based IoCs include EDR alerts for anomalous Scheduled Tasks launching browser processes or unknown executables from the `%AppData%` directory. Network IoCs include a massive increase in DNS queries and HTTP connections to known adware affiliate networks, tracking domains, and click-fraud infrastructure.
MITRE ATT&CK Techniques
Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:
| Technique | Name | Tactic | Official Spec |
|---|---|---|---|
T1176 | Browser Extensions (Installing malicious add-ons to facilitate ad injection) | Persistence | ATT&CK ↗ |
T1562.001 | Impair Defenses: Disable or Modify Tools (Modifying browser settings without consent) | Defense Evasion | ATT&CK ↗ |
T1189 | Drive-by Compromise (Initial distribution via software bundles) | Initial Access | ATT&CK ↗ |
MITRE D3FEND™ Defensive Countermeasures
Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):
| D3FEND ID | Countermeasure Name | Tactic | Countered ATT&CK | Defensive Guidance |
|---|---|---|---|---|
D3-BEA | Browser Extension Allowlisting | Harden | T1176 | Deploy enterprise browser policies via GPO or Intune to block unauthorized side-loaded extensions and add-ons. |
D3-RBI | Remote Browser Isolation | Isolate | T1189 | Execute untrusted web browsing sessions in disposable cloud containers to isolate drive-by exploits from local endpoints. |
D3-STA | Security Tool Anti-Tamper Enforcement | Harden | T1562.001 | Block unauthorized modification of antivirus registry flags and prevent stopping security agent services. |
Tiered Detection Rules (Cisco CAIRN Model)
Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:
Tier 1 Primitive Artifact Rule (Fast Triage)
Matches raw strings and file markers. Vulnerable to binary repacking and simple obfuscation.
rule MALWARE_WIN_VIGRAM_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Vigram"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "vigram" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Tier 2 Behavioral Context Rule (Process Chains & Sigma)
Tracks parent-child process anomalies and suspicious scripting telemetry. Resilient against file renames.
title: SystemHelpDesk Detection - Vigram (Advanced Threat) Execution & Triage
id: 3a0ba0c3-f91f-5e30-bd23-9d7823d75fe1
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Vigram malware family. Detects proxy execution, reflective DLL loading,
and remote command injection associated with modular enterprise backdoors.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/vigram
- https://malware-families-catalog.systemhelpdesk.com/defensive/backdoor-rat-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.advanced-threat
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1176
- attack.t1189
- attack.t1562_001
logsource:
category: process_creation
product: windows
detection:
selection_process:
Image|endswith:
- \powershell.exe
- \cmd.exe
- \rundll32.exe
- \regsvr32.exe
CommandLine|contains:
- DownloadString
- IEX(
- '/s /n /u /i:'
- sc create
- start-process
condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: highTier 3 Attribution Fingerprint Rule (High Fidelity)
Deep signature matching distinctive operational fingerprints and payload characteristics.
rule MALWARE_WIN_VIGRAM_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Vigram tradecraft"
tier = "T3 - Attribution Fingerprint"
confidence = "High (Confirmed Family Signature)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
// Core family identifier & heuristic payload signatures
$attrib_str = "vigram" ascii wide nocase
$pe_magic = "MZ" ascii
$net_marker = "http" ascii nocase
condition:
uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}Containment & Response Steps
Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.
- Utilize the Windows 'Programs and Features' Control Panel to uninstall Vigram and any related software installed concurrently.
- Meticulously review the Windows Task Scheduler; Vigram relies heavily on scheduled tasks to reinstall its browser extensions.
- Reset all web browsers (Chrome, Edge, Firefox) to their default settings to remove the injected extensions and reset homepages.
- Deploy an enterprise-grade PUP/Adware removal tool to locate and clean the randomized, hidden files and registry hooks.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not allow users to click on the advertisements generated by Vigram, as they frequently lead to tech support scams or malware.
- Avoid trying to manually clean the registry without a specialized tool, as adware often uses complex, randomized keys.
References & External Analysis
- Search "vigram" on VirusTotal (External Analysis)
- Search "vigram" on Any.Run (Sandbox Sandbox)
- Search "vigram" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Vigram and what threat category does it belong to?
Vigram is classified as a Advanced Threat. Documented across security telemetry, it is engineered to execute unauthorized operations, establish persistent footholds on target endpoints, and facilitate malicious campaigns targeting enterprise and individual environments.
How does Vigram establish persistence and evade defensive controls?
Vigram typically establishes persistence through registry run keys, scheduled tasks, or service installations, while evading signature-based antivirus solutions through code obfuscation, memory injection, or anti-analysis sandbox checks.
What are the essential incident response steps for mitigating a Vigram compromise?
Security teams responding to Vigram should immediately isolate affected endpoints from the network, perform memory triage to capture volatile forensic artifacts, audit registry and startup persistence mechanisms, revoke exposed user credentials, and restore systems from verified, clean backups.
What lateral movement and credential access tactics does Vigram leverage in enterprise intrusions?
Vigram frequently utilizes privileged account harvesting techniques such as LSASS memory dumping, Kerberoasting, and token impersonation to escalate privileges. Once administrative credentials are acquired, it pivots across the victim network utilizing living-off-the-land binaries (LOLBins) such as WMI, PowerShell remoting, and PsExec, or abuses remote desktop protocols (RDP) to reach critical internal repositories and domain controllers.
How does Vigram maintain covert communications and evade perimeter network monitoring?
Vigram often relies on multi-stage command and control (C2) architectures utilizing encrypted protocols over standard web ports (HTTPS/443 or DNS tunneling) to blend in with legitimate enterprise network traffic. Many variants incorporate proxy networks, domain fronting, or cloud services (such as Microsoft Graph API, Google Drive, or Telegram) to masquerade C2 channels, bypassing traditional signature-based egress filtering.
How do I remove the Vigram Advanced_Threat from Windows?
Manual removal of Vigram 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 Vigram a virus or a Advanced_Threat?
Vigram is classified as a Advanced_Threat. Unlike traditional viruses that infect files, modern malware like Vigram typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Vigram infection?
Symptoms of Vigram 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.
Protect Your Network Against Advanced_Threats
Want to prevent Vigram and similar threats from compromising your organization? Read our comprehensive defensive guide: Think You've Been Hacked? What To Do First.
📣 Threat Intel Correction or Update?
Notice an outdated IOC, unlisted alias, or disputed attribution? Threat researchers are invited to propose an update on GitHub or contact the SystemHelpDesk research desk. All community revisions are credited in our public CHANGELOG.
Machine-readable
Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/vigram.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.