Yakes
Overview
Executive Summary
Yakes (often detected as Trojan.Yakes or Win32/Yakes) is a generic classification used by some security vendors to identify a family of obfuscated Trojan downloaders. Its primary function is to serve as an initial foothold on a compromised system, operating stealthily to download and execute more complex and destructive secondary payloads, such as banking trojans, information stealers, or ransomware, based on instructions from its Command and Control (C2) server.Infection Vector and Technical Capabilities
Yakes is primarily distributed via malicious email campaigns (malspam) containing obfuscated JavaScript or macro-enabled Office documents, or via drive-by downloads from compromised websites hosting exploit kits. Its technical design is optimized for evasion and delivery:- Evasion and Packing: Yakes executables are typically heavily packed or obfuscated using custom crypters to evade static signature-based antivirus detection. The payload often decrypts itself only in memory upon execution.
- C2 Communication: Once active, the Trojan establishes a covert connection to a remote C2 server, sending basic system telemetry (OS version, architecture) to register the new infection.
- Payload Execution: The C2 server responds with an encrypted secondary payload. Yakes downloads this file, decrypts it, and frequently utilizes process hollowing to inject the secondary malware into a legitimate Windows process (like `explorer.exe`), hiding it from traditional monitoring tools.
Threat Assessment
A Yakes detection is a critical indicator of compromise. It signifies that the initial perimeter defenses have failed and the machine is either actively downloading or has already downloaded a severe secondary payload. The true threat level depends entirely on what Yakes was instructed to deploy.Incident Response and Remediation
- Immediate Network Isolation: The endpoint must be disconnected from the network immediately to interrupt the download of secondary payloads and prevent potential lateral movement across the LAN.
- EDR Triage for Child Processes: Security analysts must utilize EDR telemetry to trace the execution tree of the Yakes process. Identifying any child processes spawned or subsequent network connections is critical to determining the full scope of the breach.
- Total Re-imaging: Because Yakes acts as a dropper for advanced malware, attempting to clean the machine manually is highly risky. A complete bare-metal wipe and re-image from a trusted baseline is strongly recommended.
Known aliases
Threat reports may refer to this family under multiple names:
MITRE ATT&CK Techniques
This family has been observed using the following ATT&CK techniques: T1105 T1059 T1027
Tactical Mitigations
Based on the techniques used by this family, consider the following defensive strategies:
- T1059: Restrict execution of scripting languages such as PowerShell, VBScript, or Python to authorized administrators. Enforce Script Block Logging.
- 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_YAKES {
meta:
description = "Detects Yakes (trojan)"
author = "SystemHelpdesk Boilerplate Generator"
date = "2026-07-06"
strings:
$s1 = "yakes" ascii wide nocase
$s2 = "trojan.yakes" ascii wide nocase
$s3 = "downloader.yakes" ascii wide nocase
$s4 = "win32/yakes" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Sigma Rule
title: Suspicious Yakes Activity
id: 21688e0069b09a7232554ccb47e04af3
status: experimental
description: Detects generic indicators of the yakes malware family.
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
CommandLine|contains:
- "*yakes*"
- "*trojan.yakes*"
- "*downloader.yakes*"
- "*win32/yakes*"
condition: selection
level: mediumReferences & External Analysis
- Search "yakes" on VirusTotal (External Analysis)
Frequently Asked Questions
Where can I learn more about yakes?
Refer to the linked MITRE ATT&CK technique pages, which document the behaviors associated with this family.
How do I remove the Yakes Trojan from Windows?
Manual removal of Yakes 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.
Is Yakes a virus or a Trojan?
Yakes is classified as a Trojan. Unlike traditional viruses that infect files, modern malware like Yakes typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Yakes infection?
Symptoms of Yakes 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.
Related Families (Category: trojan)
Explore other malware families in the same category:
Protect Your Network Against Trojans
Want to prevent Yakes and similar threats from compromising your organization? Read our comprehensive defensive guide: Banking Trojan Protection.
Machine-readable
Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/yakes.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.