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Introduction: A Quiet Digital Intrusion With Loud Consequences
SolyxImmortal is not just another piece of malware floating in the wild. It represents a growing trend of Python-based information stealers that blur the line between simplicity and destructive capability. Built to operate quietly on Windows systems, it focuses on harvesting browser credentials, keystrokes, documents, and screenshots while remaining hidden in plain sight. What makes it especially concerning is its use of familiar platforms like Discord for data exfiltration, turning a popular communication tool into a covert command channel for cyber theft.
Summary of the Original Threat Intelligence
The malware, identified in threat intelligence reports by Cyfirma and supported by additional research, is a Python-driven infostealer targeting Windows environments. It extracts Chromium-based browser credentials, Firefox cookies, and sensitive files, while also logging keystrokes continuously. SolyxImmortal uses persistence techniques such as registry modification and file duplication into system directories. It also targets Turkish-speaking users specifically, using localized keywords for triggering screenshots during sensitive sessions such as banking or email logins.
SolyxImmortal Malware Architecture and Design
SolyxImmortal is built using standard Python modules, leveraging threading, OS interaction, and cryptographic libraries. This design choice makes it lightweight yet extremely effective. The malware’s structure allows simultaneous data collection tasks without slowing down the infected system, creating a silent surveillance layer that users rarely notice.
Initial Execution and System Infiltration
Upon execution, SolyxImmortal immediately duplicates itself into the Windows APPDATA directory under a disguised folder name resembling system graphics components. This step ensures the malware blends into legitimate system files, reducing suspicion during manual inspection or automated scans.
Persistence Through Registry Manipulation
To guarantee long-term survival on the infected host, SolyxImmortal modifies the Windows CurrentVersion Run registry key. This ensures automatic execution every time the system starts, effectively locking the malware into the boot cycle of the operating system.
Staging and Data Preparation
Before exfiltration, the malware creates a temporary staging directory called Solyx_Pack_Final inside the system TEMP folder. This folder becomes a collection point for all stolen credentials, files, and logs before they are compressed or formatted for transfer.
Browser Credential Theft Mechanism
SolyxImmortal specifically targets Chromium-based browsers by extracting decryption keys from Local State files. These keys allow the malware to decrypt saved passwords stored in SQLite databases, exposing usernames and credentials in plain text. The stolen data is saved in a file named “sifreler.txt”, reinforcing its Turkish targeting focus.
Expanded Data Harvesting Beyond Browsers
Beyond browser credentials, the malware scans Firefox cookie stores and searches for user documents including PDFs, Word files, Excel sheets, and plain text documents. It selectively ignores system files and focuses on user-generated content, ensuring maximum value extraction with minimal system disruption.
Selective File Targeting Strategy
To optimize exfiltration speed, SolyxImmortal only targets files ranging between 100 bytes and 10 megabytes. This avoids system-critical files while prioritizing documents likely to contain personal or corporate data.
Keylogging Surveillance Engine
The malware includes a continuous keylogger that records every keystroke made by the victim. This data is temporarily stored in memory buffers and periodically packaged into structured JSON payloads for transmission.
Discord-Based Data Exfiltration
Every 60 seconds, SolyxImmortal uses Python threads to send stolen data to attacker-controlled Discord webhooks. This method bypasses traditional detection systems by hiding malicious traffic inside legitimate platform communication channels.
Screen Capture and Behavioral Monitoring
In addition to logging keystrokes, the malware captures screenshots every two minutes. It also triggers instant captures when window titles match sensitive keywords such as banking portals or email services, indicating a focus on financial theft.
Targeted Turkish User Exploitation
SolyxImmortal shows clear targeting toward Turkish-speaking victims. Hardcoded Turkish phrases and keywords are embedded in the malware logic, especially for detecting banking activity and labeling stolen credential files.
What Undercode Say:
Python malware is becoming a preferred weapon due to its simplicity and portability
Discord webhook abuse demonstrates how legitimate platforms can be weaponized
Persistence via registry keys remains one of the most effective stealth techniques
Browser credential theft is still the primary objective of modern infostealers
Localized targeting shows attackers now design region-specific malware campaigns
Threading allows continuous surveillance without system interruption
Temporary staging folders reduce detection probability during file collection
Keylogging remains a reliable method for capturing sensitive credentials
JSON formatting indicates structured exfiltration pipelines
Multi-module Python use lowers development complexity for attackers
File filtering improves efficiency and avoids system crashes
Screen capture automation increases attack precision
Banking keyword triggers show financial motivation behind the malware
Firefox and Chromium targeting covers most user bases
Discord APIs reduce infrastructure costs for attackers
Registry persistence ensures reboot survival
AppData hiding technique exploits trusted system directories
Exfiltration timing every 60 seconds reduces detection windows
Screenshot intervals balance stealth and data collection
Local language usage suggests cultural targeting strategy
Credential dumping into text files simplifies attacker access
Multi-threading increases parallel data collection efficiency
Temporary buffers reduce memory footprint visibility
System directory exclusion prevents crashes and alerts
Malware prioritizes user-generated content over system files
JSON payload structure suggests automation on attacker side
Screen monitoring indicates hybrid spyware capabilities
Python ecosystem enables rapid malware development
Stealth design focuses on blending into normal processes
Banking keyword detection implies real-time financial theft
Clipboard and keystroke capture increases credential exposure
Malware lifecycle is fully automated after execution
Use of Discord avoids traditional C2 infrastructure detection
File size filtering reduces forensic trace footprint
Persistence mechanisms survive system reboot cycles
Credential extraction relies on browser encryption weaknesses
Local staging folders act as malware workspace
Multi-vector data theft increases attacker success rate
Automation reduces attacker manual involvement
SolyxImmortal represents evolution of lightweight spyware engineering
✅ Threat behavior aligns with known Python-based infostealer patterns
❌ Discord webhook abuse is not exclusive to this malware family
✅ Browser credential extraction from Chromium Local State files is technically valid and widely documented
Prediction
(+1) Python-based infostealers will continue to rise due to ease of development and cross-platform adaptability 📈
(+1) Abuse of legitimate platforms like Discord will increase as attackers seek low-cost infrastructure channels 🌐
(-1) Detection systems will gradually improve against registry-based persistence and webhook exfiltration techniques 🛡️
Deep Analysis: Technical Breakdown and Security Commands
Windows Inspection Commands
reg query "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" tasklist /v wmic process list full
Linux Threat Hunting Equivalents
ps aux | grep python lsof -i -n -P cat ~/.bash_history
File Forensics
find / -type f -size +100k -size -10M sha256sum suspicious_file.py
Network Monitoring
netstat -ano tcpdump -i any port 443
Behavioral Response Strategy
Isolate infected host immediately from network
Inspect AppData and TEMP directories for staged payloads
Analyze registry Run keys for persistence entries
Block Discord webhook endpoints at firewall level
Extract memory snapshots for keylogger artifacts
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References:
Reported By: cyberpress.org
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