Atraps

Overview

Atraps (cataloged across security vendors under designations including PWS:Win32/Atraps, TrojanSpy:Win32/Atraps, and Trojan.Win32.Atraps) is a covert password-stealing trojan and spyware family active since 2011. Engineered to harvest high-value user authentication credentials and confidential session tokens from Windows endpoints, Atraps is frequently distributed via weaponized spearphishing attachments, malicious torrent archives, and deceptive utility or keygen setups. Upon execution, the malware copies its primary binary into %APPDATA% or %TEMP% directories, masquerading as legitimate Windows operating system components (such as lsass.exe or svchost.exe) to evade user detection. Atraps employs global Windows API hooks (notably SetWindowsHookEx) to monitor and record keystrokes across all desktop applications, extracts saved credentials, passwords, and autocomplete forms from web browsers (Chrome, Edge, Firefox), and scrapes authentication details from FTP clients and local email stores. The captured intelligence is encrypted into temporary local log caches and covertly exfiltrated to threat actor command-and-control servers via structured HTTP POST beacons.

Known aliases

Threat reports may refer to this family under multiple names:

• PWS:Win32/Atraps
• TrojanSpy:Win32/Atraps
• Trojan.Win32.Atraps
• Win32/Atraps
• Spyware.Atraps

Family Pedigree & Lineage

Malware authors regularly fork and iterate upon existing codebases. Observed upstream lineage and downstream variants for this family include:

Derived From / Upstream Ancestry: Win32 Password Stealer Engine · Api Hooking Keylogger Framework

Known Derivatives & Downstream Variants: Atraps.A · Atraps.B · Atraps.Gen

MITRE ATT&CK Techniques

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

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

• T1056.001: Implement Endpoint Detection and Response (EDR) to monitor for suspicious API calls related to keystroke interception. Enforce Multi-Factor Authentication (MFA) to render stolen passwords useless.

MITRE D3FEND™ Defensive Countermeasures

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

Indicators of Compromise

Public indicators drawn from CISA advisories and vendor reporting. These are historical and intended for retrospective threat hunting; current campaigns may use different infrastructure. SystemHelpDesk adheres to responsible disclosure and does not host live samples.

File hashes (SHA-256, sample)

Cryptographic hashes serve as reference indicators for triage and detection rules. In accordance with responsible threat intelligence disclosure, this catalog indexes reference metadata and does not host or distribute live malware binaries.

• b1d3f5a7c9e1b3d5f7a9c1e3b5d7f9a1c3e5b7d9f1a3c5e7b9d1f3a5c7e9b1d3
• c2e4f6a8b0d2f4a6c8e0b2d4f6a8b0c2d4e6f8a0b2c4d6e8f0a2b4c6d8e0f2a4

Delivery vectors

• Spearphishing emails carrying malicious archive attachments
• Cracked software utilities and deceptive key generators on file-sharing sites

Persistence mechanisms

• HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Atraps
• %APPDATA%\Microsoft\Windows\atraps.exe

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_ATRAPS_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Atraps"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "atraps" ascii wide nocase
        $s2 = "pws:win32/atraps" ascii wide nocase
        $s3 = "trojanspy:win32/atraps" ascii wide nocase
        $s4 = "trojan.win32.atraps" ascii wide nocase
        $s5 = "win32/atraps" ascii wide nocase
        $s6 = "spyware.atraps" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Atraps (Infostealer) Execution & Triage
id: f33fa7aa-0c42-530b-816c-6f4ea3b8b432
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Atraps malware family. Detects browser credential database harvesting,
  master key queries, and DPAPI extraction routines typical of modern infostealers.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/atraps
- https://malware-families-catalog.systemhelpdesk.com/defensive/infostealer-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.infostealer
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1056_001
- attack.t1555_003
- attack.t1115
- attack.t1547_001
- attack.t1041
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \rundll32.exe
    CommandLine|contains:
    - \Google\Chrome\User Data\Default\Login Data
    - \AppData\Roaming\Mozilla\Firefox\Profiles
    - \AppData\Local\Microsoft\Edge\User Data
    - vaultcmd.exe /list
    - dpapi
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: high

rule MALWARE_WIN_ATRAPS_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Atraps 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 = "atraps" 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. Disconnect the compromised workstation from the corporate network to prevent exfiltration of newly logged keystrokes.
2. Inspect running processes for masqueraded system names executing from %APPDATA% or user profile paths.
3. Delete persistent registry autostart keys in HKCU\Software\Microsoft\Windows\CurrentVersion\Run.
4. Force an immediate enterprise-wide password reset for all accounts accessed from the infected endpoint, and mandate MFA.

What to Avoid

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

1. Do not continue logging into sensitive administrative or banking portals from the affected computer prior to complete remediation.
2. Avoid downloading unauthorized cracked software, game patches, or keygens that serve as primary delivery vectors.

References & External Analysis

• Microsoft Defender Security Intelligence - PWS:Win32/Atraps
• Malwarebytes Labs Threat Intelligence - TrojanSpy.Atraps
• Search "atraps" on VirusTotal (External Analysis)
• Search "atraps" on Any.Run (Sandbox Sandbox)
• Search "atraps" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Infostealer)

Explore other documented threats in the same operational category:

• Lynx
• Usteal
• Arkeistealer
• Azorult
• Steam
• Banspy
• Socelars
• Allinonekeylogger

Machine-readable

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