Overview

Trojan:Win32/Ulise is a generic detection for a family of stealthy trojans and malicious downloaders targeting Windows operating systems.

Understanding the Threat
To the average user, an Ulise infection is invisible until the system begins to significantly slow down or display unwanted pop-ups. For security analysts, Ulise acts as a primary staging payload. Its core objective is to silently breach the endpoint, establish a secure command-and-control (C2) channel, and deploy secondary, often more devastating, malware.

Execution and TTPs
Ulise is heavily distributed via malicious spam (malspam) campaigns containing weaponized Office documents or PDF attachments. Upon execution, it utilizes process hollowing and API hooking to inject its malicious code into legitimate Windows processes, such as svchost.exe or explorer.exe. This technique allows it to evade basic signature-based antivirus detection. Once persistence is established via the Registry, Ulise reaches out to attacker-controlled domains to download its secondary payload, which frequently includes ransomware (like Cryptolocker), banking trojans, or cryptocurrency miners.

Indicators of Compromise (IoCs)
Threat hunters investigating Ulise should look for unexpected network connections originating from standard system processes, anomalous registry key creations in HKCU\Software\Microsoft\Windows\CurrentVersion\Run, and the presence of obfuscated binary files dropped in the %AppData% or %Temp% directories.

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to the MITRE ATT&CK framework:

Technique	Name	Tactic
`T1566.001`	Phishing: Spearphishing Attachment	Initial Access
`T1055.012`	Process Injection: Process Hollowing	Defense Evasion
`T1105`	Ingress Tool Transfer	Command and Control
`T1071.001`	Application Layer Protocol: Web Protocols	Command and Control
`T1059.003`	Command and Scripting Interpreter: Windows Command Shell	Execution

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

Sigma Rule

title: Suspicious Ulise Activity
id: eea4420784e48d4bafba97c27656739b
status: experimental
description: Detects generic indicators of the ulise malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*ulise*"
    condition: selection
level: medium

Containment & Response Steps

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

Immediately sever the endpoint's network connection to halt the downloading of secondary payloads (like ransomware).
Perform live memory forensics (using tools like Volatility) to identify and dump the injected code from hollowed processes.
Identify and block the remote Command-and-Control (C2) IP addresses and domains at the perimeter firewall.
Conduct a full threat hunt across the environment using the identified file hashes and network Indicators of Compromise (IoCs).

What to Avoid

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

Do not simply reboot the machine and assume it is clean; Ulise's registry modifications ensure it will survive a reboot.
Do not connect external backup drives to the infected machine, as secondary payloads (like ransomware) may encrypt them.

Ulise

Overview

MITRE ATT&CK Techniques

Generated Detections (Boilerplate)

YARA Rule

Sigma Rule

Containment & Response Steps

What to Avoid

References & External Analysis

Related Families (Category: adware)

Machine-readable

Ecosystem & Interactive Environments