Daum
Table of Contents
Overview
Adware:Win32/Daum is a classification for Potentially Unwanted Programs (PUPs) and adware heavily associated with South Korean distribution networks (often leveraging the name of the legitimate Daum web portal). It is primarily designed to hijack browser settings, forcing the default search engine and homepage to specific affiliate sites, and injecting intrusive advertisements into the user's browsing sessions to generate fraudulent revenue (`T1189`).
Understanding Daum (Adware/Hijacker)
To an end-user, Daum is highly disruptive. They will find their preferred search engine (like Google) replaced, and every search query will be redirected through tracking domains. For an IT department, Daum adware represents a frustrating loss of productivity and a potential vector for more severe malvertising attacks, particularly if the endpoint frequently visits Korean web properties.
Execution and Hijacking Mechanics
Daum adware is typically bundled with freeware or deceptive game installers targeting Asian markets. Upon execution, it establishes persistence via Registry Run keys or Scheduled Tasks (`T1547.001`). It then aggressively modifies the browser configuration files and registry settings (e.g., `Start Page`, `Search Page`) for Internet Explorer, Chrome, and Edge (`T1562.001`). Advanced variants may drop malicious Browser Helper Objects (BHOs) or extensions that continuously monitor and inject ads into web traffic.
Indicators of Compromise & Impact
The impact is a degraded user experience, loss of privacy, and potential exposure to further malware. Host-based IoCs include the presence of unexpected software in `%ProgramFiles%` (often with Korean language strings or metadata), unauthorized modifications to browser registry keys, and the forced installation of extensions. Network IoCs include web traffic constantly redirecting through specific tracking or affiliate URLs before reaching the intended destination.
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):
| D3FEND ID | Countermeasure Name | Tactic | Countered ATT&CK | Defensive Guidance |
|---|---|---|---|---|
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-RPM | Registry Persistence Monitoring | Detect | T1547.001 | Audit and restrict write privileges to user and machine-level Registry Run/RunOnce keys using Endpoint Privilege Management. |
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_DAUM_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Daum"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "daum" 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 - Daum (Advanced Threat) Execution & Triage
id: af2e24ca-75b6-58c6-a6bc-1cd0eae0e20b
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Daum 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/daum
- 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.t1547_001
- attack.t1562_001
- attack.t1189
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_DAUM_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Daum 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 = "daum" 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.
- Use the standard Windows 'Programs and Features' applet to attempt uninstallation of the software.
- Follow up with a robust Adware/PUP removal tool (like AdwCleaner) to eliminate lingering registry hooks and scheduled tasks.
- Reset all installed web browsers to their factory defaults to completely clear out hijacked search settings and extensions.
- Educate users about the risks of software bundling, especially when downloading freeware from international aggregation sites.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not rely on simply changing the homepage back in the browser settings; the adware's persistence mechanism will change it back upon reboot.
- Avoid ignoring adware infections; the underlying affiliate networks they use are often compromised by threat actors.
References & External Analysis
- Search "daum" on VirusTotal (External Analysis)
- Search "daum" on Any.Run (Sandbox Sandbox)
- Search "daum" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Daum and what threat category does it belong to?
Daum 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 Daum establish persistence and evade defensive controls?
Daum 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 Daum compromise?
Security teams responding to Daum 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 Daum leverage in enterprise intrusions?
Daum 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 Daum maintain covert communications and evade perimeter network monitoring?
Daum 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 Daum from Windows?
Manual removal of Daum 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.
What are the main symptoms of a Daum infection?
Symptoms of Daum 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 Daum 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/daum.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.