Ribaj

Overview

Trojan:Win32/Ribaj is a stealthy information stealer and backdoor trojan designed to silently harvest credentials, banking information, and sensitive files from compromised endpoints.

What is Ribaj?
For the victim, Ribaj provides no visible symptoms, operating entirely in the background. For threat intelligence analysts, Ribaj is a highly effective data exfiltration tool. It is specifically engineered to bypass endpoint defenses, hook into web browsers to steal saved passwords and session cookies, and establish a covert Command-and-Control (C2) channel to transmit the stolen data back to the attacker.

Infection Vectors & Threat Hunting
Ribaj is typically distributed via spearphishing campaigns containing malicious attachments or dropped as a secondary payload by exploit kits. Upon execution, it drops a highly obfuscated executable into the <code>%AppData% or %LocalAppData% directory. It establishes persistence via the registry Run keys or by creating a hidden scheduled task. Ribaj injects its core data-harvesting modules into legitimate processes like explorer.exe or svchost.exe. Threat hunters should monitor for anomalous outbound HTTP/HTTPS traffic containing encrypted POST data originating from injected system processes.

Forensic Analysis & Impact
The impact of Ribaj is a massive breach of confidentiality. It actively hunts for cryptocurrency wallets, FTP credentials, and browser auto-fill data. Incident responders should analyze memory dumps to identify the injected modules and extract the C2 domains. Dropped configuration files (often encrypted .dat files) in the user's profile directory are strong IoCs. Immediate password resets for all compromised accounts are mandatory.

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to the 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.

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

Sigma Rule

title: Suspicious Ribaj Activity
id: 368461eb01051e6ac0498d7d5779c1c6
status: experimental
description: Detects generic indicators of the ribaj malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*ribaj*"
    condition: selection
level: medium

Containment & Response Steps

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

1. Instantly isolate the endpoint from the network to halt the active exfiltration of stolen credentials and sensitive files.
2. Force a global password reset for all user accounts, prioritizing corporate VPN access, email, and financial portals.
3. Utilize EDR or memory forensics to identify and terminate the legitimate processes (like <code>explorer.exe</code>) that have been injected with the Ribaj payload.
4. Rebuild the operating system from a known-clean image to ensure complete eradication of the backdoor.

What to Avoid

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

1. Do not allow the user to continue working on the infected machine, as the active keylogger will capture any new credentials entered.
2. Avoid relying solely on network blocks, as Ribaj frequently utilizes Domain Generation Algorithms (DGAs) or dynamic DNS to shift its C2 infrastructure.

References & External Analysis

• Search "ribaj" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: trojan_generic)

Explore other malware families in the same category:

• Rodecap
• Sfone
• Hematite
• Buzus
• Atraps

Machine-readable

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