InactiveWindowsCredential theft
Malware Intelligence

Mystic Stealer

Mystic is an infostealer that collects credentials from about 40 browsers and more than 70 browser extensions and targets crypto wallets, Steam and Telegram. Its code is heavily obfuscated with polymorphic string obfuscation and hash-based import resolution.

Activity map

Activity mapPackagingExfiltrationMystic StealerInfostealerData collection15 targetsLog archiveC2 server
Malicious payloadMystic Stealer · Infostealer

Mystic is an infostealer that collects credentials from about 40 browsers and more than 70 browser extensions and targets crypto wallets, Steam and Telegram. Its code is heavily obfuscated with polymorphic string obfuscation and hash-based import resolution.

Environment information

  • Operating system
  • Hardware
  • IP and location
  • Installed software

Credentials and application data

  • Saved passwords
  • Session cookies
  • Autofill
  • Steam
  • Telegram
  • MetaMask
  • Phantom
  • Coinbase Wallet
  • Trust Wallet
  • Binance Wallet
  • TronLink
Dark Radar infection records
87,453
Latest infection record
30 December 2024
Malware type
Infostealer
First seen
April 2023
01

Overview

Ranks 18 of 52 families in Dark Radar data, with 87,453 infection records.

02

Origin and evolution

  1. April 2023Announced on forums.Zscaler
03

Technical profile

Malware typeInfostealer
Target operating systemWindows
Primary purposeData theft
Threat categoryCredential theft
Programming languageC/C++
Distribution modelSubscription service (MaaS)
First seenApril 2023
Infected systemsWindows 10 84%, Windows 7 12%
Public source confidenceMedium
04

Targeted applications

15 applications5 categories
05

Data collection

Credentials

  • Browser passwords97%Verified
  • Session cookies92.5%Verified
  • Refreshing expired sessions—
  • Autofill95%Dark Radar observation
  • macOS Keychain—
  • 2FA and password managers—

Financial

  • Saved cards—
  • Desktop crypto walletsVerified
  • Wallet extensionsVerified
  • Clipboard address replacement—

Applications

  • Email clients—
  • FTP clients—
  • VPN clients—
  • Messaging applications11%Verified
  • Gaming platforms17%Verified

System

  • File collection—
  • Screenshot—
  • System inventory100%Dark Radar observation

Behavior

  • Additional payload download—
  • Persistence—
  • Anti-analysisVerified
06

File system

User profile (%USERPROFILE%)
File details are in Dark Radar IntelligenceOpen in Intelligence
07

How it works

  1. 1Execution and evasion

    T1204.002User Execution: Malicious FileT1027Obfuscated Files or Information

    Breaking point: Unsigned files running from user folders and injections into .NET tools are stopped by application control and EDR.

  2. 2Discovery

    Dark Radar observation

    Infected systems: Windows 10 84%, Windows 7 12%, Windows 8.1 2.5%.

    T1082System Information Discovery

    Breaking point: Bulk system and security software queries from a short-lived process trigger an EDR alert.

  3. 3Data collection

    Dark Radar observation

    Data found in the latest 200 logs: password file 97%, cookies 92.5%, autofill 95%, cards 2.5%, wallets 1.5%.

    T1555.003Credentials from Web BrowsersT1539Steal Web Session CookieT1005Data from Local System

    Breaking point: A process other than the browser reading browser profile files is blocked or triggers an alert.

  4. 4Exfiltration and C2

    T1071.001Web ProtocolsT1041Exfiltration Over C2 ChannelT1095Non-Application Layer Protocol

    Breaking point: Traffic to newly registered domains, direct IP addresses and non-standard ports is blocked.

08

Network communication

This section is in Dark Radar IntelligenceOpen in Intelligence
09

MITRE ATT&CK

Execution
Credential Access
Discovery
Collection
Command and Control
Exfiltration
Defense Evasion
10

IOCs and detection

This section is in Dark Radar IntelligenceOpen in Intelligence
11

Risk and impact

  • Stolen session cookies are enough to take over cloud, email and SaaS sessions without a password or multi-factor authentication prompt.
  • Corporate passwords saved on personal devices also leak through infections outside the corporate network; these logs are sold to initial access brokers.
  • Log archives are reshared for years; as long as the password is not changed, the same credential can be used again and again.
  • Compromised email, messaging and social media accounts become the next link in phishing and malware distribution.
12

Defense

  • When an infection is detected, revoke not only the password but all related sessions and access tokens.
  • Turn off password saving in the browser through corporate policy; use a corporate password manager.
  • Move to phishing-resistant multi-factor authentication (FIDO2/passkey); bind sessions to the device.
  • Block setup files downloaded from unlicensed software, game cheats and sponsored search results.
  • Monitor flows where the user runs a command by pasting it into the Run dialog or terminal (ClickFix) with endpoint rules.
  • Continuously monitor your corporate domains and employee email addresses in stealer logs with Dark Radar.
13

Learning center

How does this malware spread?
  • Infostealer families mostly spread through unlicensed software, fake updates, sponsored search ads and phishing emails.
How can its presence on a system be detected?
  • Sign-ins to accounts from an unrecognized country or device.
  • A new infostealer log in Dark Radar for your corporate domain or an employee email address.
Which Windows artifacts should be examined?
  • Prefetch (C:\Windows\Prefetch) — shows that a short-lived payload ran.
  • Amcache.hve and ShimCache — path and hash of the executed file.
  • Downloads folder and Zone.Identifier stream — the address the file was downloaded from.
  • Browser history — the fake download page or fake CAPTCHA address.
  • RunMRU registry key — commands pasted into the Run dialog.
  • Randomly named folders and DLLs under %TEMP% and %LOCALAPPDATA%.
Which log records matter?
  • Sysmon Event 1 / Security 4688Process creation: unsigned processes starting from Temp and Downloads folders, mshta, powershell -enc chains.
  • Sysmon Olay 11 / 23File creation and deletion: self-deleting payloads, DLLs dropped under Temp.
  • Sysmon Olay 3 / 22Network connection and DNS query: to newly registered domains, C2 resolution via Telegram, Steam or Pastebin.
  • Object access auditing (4663)A process other than the browser reading Login Data, Cookies and Local State files.
  • PowerShell 4104Script block logging: obfuscated downloader commands.
  • Identity provider sign-in logsSessions after the infection from a different country and device, without a multi-factor authentication prompt.
Which MITRE techniques is it associated with?
T1204.002User Execution: Malicious FileT1555.003Credentials from Web BrowsersT1539Steal Web Session CookieT1082System Information DiscoveryT1005Data from Local SystemT1071.001Web ProtocolsT1041Exfiltration Over C2 ChannelT1027Obfuscated Files or InformationT1095Non-Application Layer Protocol
How should a SOC analyst respond?
  1. Isolate the device from the network; do not reinstall it before taking memory and disk images.
  2. Determine the infection date; list all accounts that were signed in on the device after that date.
  3. Change the passwords of these accounts, revoke their sessions and access tokens, and re-enroll multi-factor authentication devices.
  4. Search identity provider and SaaS logs for new country, device and token usage after the infection.
  5. If a recovery phrase or wallet file was exposed, move the assets to a new wallet.
  6. Find the initial access path (email, ad, unlicensed software, fake CAPTCHA) and check other users who used the same path.
  7. Reinstall the device from a clean image.
14

Sources

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