Arkeistealer

Overview

Trojan:Win32/Arkeistealer (or simply Arkei) is a prolific and highly capable Information Stealer. Sold as Malware-as-a-Service (MaaS) on underground forums, it is designed to aggressively harvest sensitive data from infected Windows hosts, including browser passwords, cryptocurrency wallets, session cookies, and desktop 2FA application tokens (`T1552`). Arkei is closely related to (and often shares code with) the infamous Vidar stealer.

Understanding Arkeistealer (InfoStealer)
To an end-user, an Arkei infection happens in the background and is entirely invisible; the first sign of trouble is usually a drained crypto wallet or compromised online accounts months later. For a SOC analyst, Arkei represents a critical breach of confidentiality. Because it steals live session cookies (`T1539`), attackers can bypass Multi-Factor Authentication (MFA) to access corporate VPNs and SaaS applications.

Execution and Exfiltration Mechanics
Arkei is typically distributed via cracked software, malicious torrents, or phishing campaigns. Once executed, it rapidly profiles the system and begins its data collection. It targets specific paths associated with Chromium and Gecko-based browsers to extract `logins.json` and `Cookies.sqlite`. It aggressively hunts for cryptocurrency wallet files (e.g., `wallet.dat`, Electrum wallets, Exodus). Arkei packages all stolen data into a single ZIP archive, exfiltrates it via HTTP POST to a hardcoded C2 server (`T1041`), and then typically deletes itself to erase forensic evidence (`T1070.004`).

Indicators of Compromise & Impact
The impact is severe credential compromise and financial theft. Host-based IoCs include rapid, automated access to browser profile directories (`%LocalAppData%\Google\Chrome\User Data\`) by an untrusted process, and the sudden creation and deletion of temporary ZIP files in the `%Temp%` directory. Network IoCs involve outbound HTTP POST requests containing large payloads to low-reputation IP addresses, often hosted on bulletproof hosting providers.

MITRE ATT&CK Techniques

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

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

Sigma Rule

title: Suspicious Arkeistealer Activity
id: a1a797befced9849dd8427f33f6e9bc4
status: experimental
description: Detects generic indicators of the arkeistealer malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*arkeistealer*"
    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 any further data exfiltration, though Arkei acts extremely fast.
2. Assume all passwords saved in the user's browser, all session cookies, and any local cryptocurrency wallets are compromised.
3. Force immediate password resets for all corporate accounts and revoke all active session tokens for the affected user.
4. Investigate the initial delivery vector (e.g., determine if the user downloaded cracked software) to prevent reinfection.

What to Avoid

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

1. Do not assume MFA protects you against Arkei; stolen session cookies bypass MFA challenges completely.
2. Avoid closing the incident after cleaning the malware; the real damage is the stolen data, which must be addressed via password resets.

References & External Analysis

• Search "arkeistealer" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: trojan)

Explore other malware families in the same category:

• Injeber
• Netdevil
• Mokes
• Bredolab
• Dsbot

Machine-readable

Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/arkeistealer.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.