Hydrapos

Overview

Trojan:Win32/Hydrapos is a highly specialized, financially motivated malware family specifically designed to infect Point-of-Sale (POS) systems in retail and hospitality environments. Its primary objective is to act as a 'RAM Scraper,' identifying and exfiltrating unencrypted credit card Track 1 and Track 2 data (Magnetic Stripe Data) directly from the memory of the checkout terminal before it can be encrypted by the payment application.

Understanding POS RAM Scrapers
To a retail clerk or customer, a Hydrapos-infected register operates entirely normally. For a threat intelligence analyst, Hydrapos represents a targeted attack on the retail supply chain. POS systems must process credit card data in plaintext for a fraction of a second in RAM to authorize the transaction. Hydrapos is designed to continuously scan the memory space of the POS software processes during this brief window, looking for strings that match the specific format of credit card track data (using Regex).

Execution and Data Exfiltration Mechanics
Attackers typically gain initial access to the retail network via weak remote access credentials (e.g., RDP, VNC) or phishing (`T1078`). Once inside, they move laterally to the POS environment. Hydrapos is deployed and establishes persistence as a stealthy Windows Service or via Registry Run keys (`T1543.003`). The core module continually enumerates running processes (`T1057`), specifically targeting the POS application (like `aloha.exe` or `micros.exe`). It injects into or reads the memory of these processes (`T1005`), scraping the Track data. The stolen credit card data is temporarily stored in an encrypted, hidden local log file. Periodically, a secondary exfiltration module transmits this log file to an external C2 server, often using HTTP POST requests or DNS tunneling (`T1048.003`).

Indicators of Compromise & Impact
The impact is a massive payment card data breach, resulting in severe financial and reputational damage. Incident responders should monitor for anomalous outbound network connections originating directly from POS terminals (which should ideally be network-segmented). EDR alerts triggered by unknown processes continuously reading the memory (`ReadProcessMemory`) of the main POS application are definitive IoCs. The presence of hidden, encrypted text files (often disguised as `.tmp` or `.log` files) in temporary directories is also highly suspicious.

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to the MITRE ATT&CK framework:

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_HYDRAPOS {
    meta:
        description = "Detects Hydrapos (trojan)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "hydrapos" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Hydrapos Activity
id: ef9e922332fdefc401407e897dd87c0f
status: experimental
description: Detects generic indicators of the hydrapos malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*hydrapos*"
    condition: selection
level: medium

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Instantly sever the network connection of any suspected infected POS terminal, but leave it powered on to preserve RAM evidence.
2. Initiate a PCI forensic investigation; capture a live memory image of the infected terminal to analyze the scraping mechanism and extract the unencrypted C2 configuration.
3. Analyze firewall logs to identify the external IP addresses the POS terminal was communicating with, and block them.
4. Force a global password reset for all remote access systems (RDP, LogMeIn, VNC) used by vendors or IT staff to access the retail network.

What to Avoid

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

1. Do not reboot the POS terminal; doing so destroys the volatile memory evidence (RAM) crucial for understanding the attack.
2. Avoid using the infected terminal for any further transactions; every swipe is actively being stolen.

References & External Analysis

• Search "hydrapos" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: trojan)

Explore other malware families in the same category:

• Spamha
• Travnet
• Xxybyu
• Ntrootkit
• Pincav

Machine-readable

Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/hydrapos.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.