Tibs

Overview

TrojanDownloader:Win32/Tibs is a classic, persistent trojan downloader designed to breach endpoint defenses and securely deliver secondary, high-severity payloads. Tibs is historically associated with botnet operations and is frequently used to drop rogue security software (fake AV), adware, or more severe banking trojans.

Understanding Tibs
To an end-user, a Tibs infection might go unnoticed initially, or it might quickly result in the appearance of aggressive pop-ups from fake antivirus programs claiming the computer is infected. For threat intelligence analysts, Tibs is a critical staging mechanism. Its primary objective is to securely bypass endpoint defenses and reach out to a Command-and-Control (C2) server to pull down the final payload.

Execution and Evasion Strategies
Tibs is commonly distributed via malspam campaigns, malicious links in instant messaging, or through exploit kits (`T1189`). Upon execution, it utilizes packing to evade static antivirus signatures. It drops a randomized executable into the `%Temp%` or `System32` directory. It establishes persistence by modifying the Registry Run keys or creating a hidden service (`T1543.003`). Tibs frequently injects its downloading routine into legitimate system processes (like `svchost.exe`) (`T1055`) to mask its outbound network traffic. It then reaches out to hardcoded HTTP URLs to download its secondary payloads (`T1105`).

Indicators of Compromise (IoCs)
Threat hunters should investigate EDR alerts related to 'Suspicious Process Injection' or `svchost.exe` making unexpected HTTP connections to unknown domains. Network logs will often reveal Tibs downloading `.exe` files disguised as `.gif` or `.txt` files. The presence of new, unexpected startup entries in the Registry is a strong IoC.

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:

• T1105: Implement network intrusion detection systems (NIDS) and host-based firewalls to block unauthorized inbound or outbound file transfers.

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

Sigma Rule

title: Suspicious Tibs Activity
id: b14105dc30173d392f4ab93e6d343bbf
status: experimental
description: Detects generic indicators of the tibs malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*tibs*"
    condition: selection
level: medium

Containment & Response Steps

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

1. Isolate the endpoint immediately to prevent Tibs from downloading and executing its secondary payloads (e.g., rogue AV or banking trojans).
2. Audit the Registry Run keys and Services to identify and remove the Tibs persistence mechanisms.
3. Review proxy logs to identify the specific URLs Tibs contacted to download payloads, and block them enterprise-wide.
4. Run a comprehensive anti-malware scan to clean up both the downloader and any payloads it successfully installed.

What to Avoid

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

1. Do not pay for any 'antivirus' software that suddenly appears and demands payment after a Tibs infection; this is the fraudulent payload.
2. Do not close an incident simply because the initial Tibs dropper was quarantined; always verify if secondary payloads were downloaded.

References & External Analysis

• Search "tibs" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: trojan)

Explore other malware families in the same category:

• Moneyinst
• Banpak
• Spesr
• Xxybwe
• Oficla

Machine-readable

Get this profile as JSON: https://jordanricky1604-ship-it.github.io/malware-families-catalog/api/tibs.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.