Badur
Table of Contents
Overview
Badur (identified in threat intelligence telemetry under detection names including Trojan:Win32/Badur, TrojanDownloader:Win32/Badur.A, Backdoor:Win32/Badur, and Win32/Badur) is a versatile Windows trojan downloader and backdoor active since 2018. Frequently distributed through spear-phishing emails containing weaponized office attachments, malicious archive files, and drive-by compromise sites, Badur establishes an initial foothold by dropping obfuscated binary payloads into hidden user directories. Once initialized, the malware queries the Windows registry, gathers hardware and network configuration details, and establishes a secure C2 channel using RC4/AES-encrypted HTTP requests. Badur functions as a multi-stage execution framework capable of downloading arbitrary PE files, spawning hollowed host processes (such as svchost.exe or dllhost.exe), modifying firewall rules, and granting threat actors persistent remote execution capabilities on victim endpoints.
Known aliases
Threat reports may refer to this family under multiple names:
Family Pedigree & Lineage
Malware authors regularly fork and iterate upon existing codebases. Observed upstream lineage and downstream variants for this family include:
Known Derivatives & Downstream Variants: Trojan:Win32/Badur.A · Trojan:Win32/Badur.B
MITRE ATT&CK Techniques
This family has been observed using the following ATT&CK techniques: T1055.012 · T1071.001 · T1105 · T1547.001 · T1497.001
Tactical Mitigations
Based on the techniques used by this family, consider the following defensive strategies:
- T1071.001: Implement web filtering and SSL/TLS inspection to detect malicious command and control (C2) traffic hiding in HTTP/HTTPS.
- 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):
| D3FEND ID | Countermeasure Name | Tactic | Countered ATT&CK | Defensive Guidance |
|---|---|---|---|---|
D3-PHA | Process Hollowing Analysis | Detect | T1055.012 | Inspect unbacked executable memory regions (PAGE_EXECUTE_READWRITE) for replaced PE image headers inside legitimate host processes. |
D3-WAF | Web Content Filtering & Inspection | Filter | T1071.001 | Block newly registered domains (NRDs) and inspect HTTP Host and URI headers for known C2 profiles. |
D3-NTI | Network Traffic Inspection | Detect | T1105 | Inspect deep packet payloads for anomalous staging binaries and unauthorized egress protocols. |
D3-EED | Execution Environment Detection | Detect | T1497.001 | Configure malware sandboxes to emulate legitimate hardware metrics, realistic mouse movements, and valid system uptimes. |
D3-RPM | Registry Persistence Monitoring | Detect | T1547.001 | Audit and restrict write privileges to user and machine-level Registry Run/RunOnce keys using Endpoint Privilege Management. |
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:
Tier 1 Primitive Artifact Rule (Fast Triage)
Matches raw strings and file markers. Vulnerable to binary repacking and simple obfuscation.
rule MALWARE_WIN_BADUR_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Badur"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "badur" ascii wide nocase
$s2 = "trojan:win32/badur" ascii wide nocase
$s3 = "trojandownloader:win32/badur.a" ascii wide nocase
$s4 = "backdoor:win32/badur" ascii wide nocase
$s5 = "win32/badur" ascii wide nocase
$s6 = "trojan.badur" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Tier 2 Behavioral Context Rule (Process Chains & Sigma)
Tracks parent-child process anomalies and suspicious scripting telemetry. Resilient against file renames.
title: SystemHelpDesk Detection - Badur (Trojan) Execution & Triage
id: 19bf57f7-a16a-5e8d-aacf-0e1149d1993d
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Badur 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/badur
- 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_012
- attack.t1071_001
- attack.t1105
- attack.t1547_001
- attack.t1497_001
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: mediumTier 3 Attribution Fingerprint Rule (High Fidelity)
Deep signature matching distinctive operational fingerprints and payload characteristics.
rule MALWARE_WIN_BADUR_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Badur 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 = "badur" 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
}References & External Analysis
- Microsoft Defender Threat Encyclopedia - Trojan:Win32/Badur
- Kaspersky Threat Intelligence - Trojan-Downloader.Win32.Badur
- Search "badur" on VirusTotal (External Analysis)
- Search "badur" on Any.Run (Sandbox Sandbox)
- Search "badur" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Trojan:Win32/Badur?
Badur is a modular Windows trojan downloader and backdoor used by cybercriminals to establish unauthorized remote access and deliver secondary malware payloads.
How does Badur communicate with its command and control servers?
It uses encrypted HTTP POST requests carrying serialized system telemetry and listens for inbound commands disguised inside simulated image or web traffic.
How does Badur maintain persistence on infected systems?
Badur creates entries under the Windows CurrentVersion\Run registry key and installs scheduled background tasks or custom Windows services.
What evasion tactics are employed by Badur?
Badur checks for virtual machine artifacts and sandboxes, decrypts strings dynamically in memory, and injects code into legitimate Windows processes.
How should enterprise security teams respond to a Badur infection?
Isolate the compromised endpoint, terminate unauthorized injected processes, block identified C2 IP addresses at perimeter firewalls, and perform full credential rotations.
How do I remove Badur from Windows?
Manual removal of Badur is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.
What are the main symptoms of a Badur infection?
Symptoms of Badur can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.
Protect Your Network Against Trojans
Want to prevent Badur and similar threats from compromising your organization? Read our comprehensive defensive guide: Banking Trojan Protection for Businesses.
📣 Threat Intel Correction or Update?
Notice an outdated IOC, unlisted alias, or disputed attribution? Threat researchers are invited to propose an update on GitHub or contact the SystemHelpDesk research desk. All community revisions are credited in our public CHANGELOG.
Machine-readable
Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/badur.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.