Ramdo

Overview

Executive Summary

Infection Vector and Technical Capabilities

• Hidden Browser Instances: Upon execution, Ramdo creates invisible, hidden instances of legitimate web browsers (like Internet Explorer or Chrome). The user sees no browser window, but the malware is actively surfing the web in the background.
• Automated Click Fraud: The malware receives a list of target URLs (ads) from its Command and Control (C2) server. It uses the hidden browser instances to load these ads and programmatically simulate human clicks, generating fraudulent revenue for the attacker's affiliate accounts.
• Domain Generation Algorithm (DGA): Ramdo utilizes a DGA to locate its C2 servers. It algorithmically generates hundreds of potential domain names daily, attempting to connect to them. This makes it highly resilient against simple DNS blocklists or domain takedowns.

Threat Assessment

Incident Response and Remediation

• Network Traffic Analysis: Security teams should monitor DNS logs for the telltale signs of a DGA (hundreds of failed DNS queries for nonsensical, random-looking domain names). This is the fastest way to identify a Ramdo infection on the network.
• Malware Removal: Utilize enterprise antivirus or EDR to scan and remove the Ramdo executable. Pay close attention to hidden startup folders and registry `Run` keys where it establishes persistence.
• Vulnerability Patching: Because Ramdo spreads via exploit kits, the infection is proof of unpatched software. The affected endpoint must have its OS and all third-party software (browsers, plugins, PDF readers) immediately updated to close the initial infection vector.

Known aliases

Threat reports may refer to this family under multiple names:

• Trojan.Ramdo
• ClickFraud.Redyms
• Win32/Ramdo

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:

MITRE D3FEND™ Defensive Countermeasures

Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):

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:

rule MALWARE_WIN_RAMDO_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Ramdo"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "ramdo" ascii wide nocase
        $s2 = "trojan.ramdo" ascii wide nocase
        $s3 = "clickfraud.redyms" ascii wide nocase
        $s4 = "win32/ramdo" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Ramdo (Click Fraud) Execution & Triage
id: f1f0ceb7-b1ca-5f2f-930b-4f17d7d23f3b
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Ramdo malware family. Detects suspicious execution from temporary user
  directories with hidden window flags and background transfer utilities.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/ramdo
- https://malware-families-catalog.systemhelpdesk.com/defensive/ransomware-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.click-fraud
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1568_002
- attack.t1129
- attack.t1547_001
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \cscript.exe
    - \wscript.exe
    CommandLine|contains:
    - AppData\Local\Temp
    - -WindowStyle Hidden
    - /e:jscript
    - bitsadmin /transfer
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: medium

rule MALWARE_WIN_RAMDO_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Ramdo 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 = "ramdo" 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.

1. Sever network connectivity for the flagged endpoint to terminate persistent command-and-control (C2) communication channels and stop Ramdo from retrieving secondary stage payloads.
2. Capture process memory triage to detect and terminate malicious threads injected by Ramdo into legitimate system processes such as explorer.exe or svchost.exe.
3. Audit Windows Registry Run keys (HKCU\Software\Microsoft\Windows\CurrentVersion\Run) and Task Scheduler entries to locate and purge Ramdo persistence hooks.
4. Deploy updated enterprise EDR detection signatures and conduct an out-of-band endpoint scan to isolate dropped binaries and staged payloads.
5. Rotate all credentials, domain user passwords, and session cookies active on the system during the Ramdo execution timeframe.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do not assume the incident is resolved simply because an antivirus tool removed the initial Ramdo dropper; always verify that secondary payloads and persistence hooks have been eradicated.
2. Avoid logging in with Domain Admin or privileged credentials on a machine suspected of running Ramdo until memory triage is complete.
3. Do not delay host isolation; automated lateral movement and credential dumping can occur within minutes of initial execution.

References & External Analysis

• Search "ramdo" on VirusTotal (External Analysis)
• Search "ramdo" on Any.Run (Sandbox Sandbox)
• Search "ramdo" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Click Fraud)

Explore other documented threats in the same operational category:

• Unruy
• Miuref

Machine-readable

Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/ramdo.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.