Socstealer

Overview

Trojan:Win32/Socstealer is a specialized form of spyware designed exclusively to harvest credentials and session tokens for major social media platforms (such as Facebook, Twitter/X, Instagram, and Discord). Unlike generic keyloggers, Socstealer represents a targeted approach to data theft, aiming to hijack valuable online identities for use in further social engineering, spam campaigns, or extortion.

Understanding Socstealer
To an end-user, a Socstealer infection is invisible. The user will only realize they have been compromised when they are suddenly locked out of their accounts, or when their friends begin receiving malicious links sent from their profiles. For a security analyst, Socstealer highlights the critical importance of protecting browser session data, as modern stealers often bypass Multi-Factor Authentication (MFA) by stealing the active session cookie rather than just the password.

Execution and Exfiltration Mechanics
Socstealer is typically distributed via phishing links sent over the very platforms it targets (e.g., a direct message on Discord containing a malicious executable disguised as a game) (`T1566.001`). Upon execution, it establishes persistence via the Registry Run keys (`T1547.001`). The malware's core function is to query the local databases (SQLite files) used by popular web browsers (Chrome, Edge, Firefox) (`T1555.003`). It specifically targets the cookies associated with social media domains. By extracting these active session tokens, the attacker can import them into their own browser and instantly assume the victim's identity without ever triggering an MFA prompt (`T1539`). The stolen database files are packed into an archive and exfiltrated to a C2 server via HTTP POST or directly to an attacker-controlled Telegram bot (`T1048.003`).

Indicators of Compromise & Impact
The impact is the complete loss of control over digital identities and potential reputational damage. Host-based IoCs include EDR alerts for unknown processes (often running from `%AppData%`) accessing sensitive browser files like `Cookies` or `Login Data`. Network IoCs involve outbound HTTPS traffic containing large POST requests to unknown IPs or Telegram API endpoints (`api.telegram.org`) immediately after execution.

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

Sigma Rule

title: Suspicious Socstealer Activity
id: b1b15cd626b1125a1cfb56debb96ecec
status: experimental
description: Detects generic indicators of the socstealer malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*socstealer*"
    condition: selection
level: medium

Containment & Response Steps

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

1. Immediately isolate the infected endpoint from the network to halt the exfiltration of browser data.
2. Instruct the user to log into their social media accounts from a known-clean device and immediately click 'Log out of all other sessions'. This invalidates the stolen cookies.
3. Instruct the user to change all their passwords, prioritizing accounts that were saved in the infected browser.
4. Scan the machine to identify and remove the Socstealer binary and its persistence mechanisms.

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 will protect the user; if the session cookie is stolen, the attacker bypasses the password and the 2FA prompt entirely.
2. Avoid allowing users to use corporate devices for personal social media browsing if the risk of credential theft is high.

References & External Analysis

• Search "socstealer" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: trojan)

Explore other malware families in the same category:

• Skypespam
• Spesr
• Wswhacker
• Habbo
• Evital

Machine-readable

Get this profile as JSON: https://jordanricky1604-ship-it.github.io/malware-families-catalog/api/socstealer.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.