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 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:

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

MITRE D3FEND™ Defensive Countermeasures

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

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_TIBS_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Tibs"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "tibs" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Tibs (Trojan) Execution & Triage
id: aebb6bb8-22c7-5d3c-b46f-0c2ee1240042
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Tibs malware family. Detects suspicious execution from temporary user directories
  with hidden window flags and background transfer utilities.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/tibs
- https://malware-families-catalog.systemhelpdesk.com/defensive/downloader-dropper-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.trojan
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1055
- attack.t1105
- attack.t1189
- attack.t1543_003
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \cscript.exe
    - \wscript.exe
    CommandLine|contains:
    - AppData\Local\Temp
    - -WindowStyle Hidden
    - /e:jscript
    - bitsadmin /transfer
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: medium

rule MALWARE_WIN_TIBS_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Tibs 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 = "tibs" 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. 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)
• Search "tibs" on Any.Run (Sandbox Sandbox)
• Search "tibs" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Trojan)

Explore other documented threats in the same operational category:

• Ulise
• Lockpos
• Fenomengame
• Ymkfawdgfnmi
• Midie
• Bobax
• Neutrinopos
• Feebs

Machine-readable

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