Daily Summary
Agent Tesla activity shows a significant decline today, with only 10 new samples identified against a 7-day average of 22. This 54% drop represents a notable cooling-off period for this persistent stealer. No new command-and-control (C2) infrastructure was registered.
New Samples Detected
JavaScript (.js) files are the dominant file type today, comprising half of the new samples, followed by .exe and a single .dll. The .js files often serve as downloaders or heavily obfuscated first-stage scripts, while the .exe files are typically the final payload. No significant new naming patterns were observed in this reduced batch.
Distribution Methods
The prevalence of .js files suggests ongoing reliance on phishing campaigns with malicious email attachments. These scripts are designed to download and execute the final Agent Tesla binary. The .exe files may be distributed through compromised software installers or direct email attachments, while the single .dll could indicate attempted sideloading or process injection techniques.
Detection Rate
Current variants show a high detection rate by major antivirus engines, with the .js scripts often flagged generically as “TrojanDownloader” or “AgentTesla.” The compiled binaries (.exe, .dll) are consistently identified. No strong evidence suggests today’s low-volume variants are successfully evading signature-based detection.
C2 Infrastructure
No new C2 servers were identified today. This aligns with the low sample volume and may indicate attackers are consolidating operations on existing, resilient infrastructure rather than deploying new endpoints, which could be a reaction to recent takedown efforts.
7-Day Trend
Today’s sharp decline follows a week of relatively steady, moderate activity. This drop could represent a temporary lull between campaigns or a shift in attacker focus to other malware families.
Security Analysis
The continued high use of .js files, even in a low-volume day, underscores a tactical shift towards fileless initial access that bypasses traditional executable-focused defenses. Compared to earlier campaigns heavy on macro-laden documents, this reflects an adaptation to improved Office security. A key defensive recommendation is to enhance logging and monitoring for cscript.exe or wscript.exe spawning unexpected child processes like powershell.exe or rundll32.exe, which is a common execution chain for these scripts.