Daily Summary
Agent Tesla activity declined sharply on 2026-05-06, with only 42 new samples detected - a 37% drop from the 7-day average of 66. This marks the lowest daily count in the past week, suggesting a temporary lull in campaign operations or a shift toward fewer, more targeted deployments.
New Samples Detected
JavaScript (.js) files dominated new samples at 15, followed by portable executables (.exe) at 11 and PowerShell scripts (.ps1) at 4. The presence of a .93763227 file extension is anomalous and likely indicates a mislabeled or obfuscated payload. The variety in file types (10 unique extensions) suggests campaign operators are testing multiple delivery chains rather than committing to a single approach. RAR archives (3) and VBS scripts (2) remain secondary vectors.
Distribution Methods
The high proportion of JavaScript and PowerShell files indicates phishing attachments and potentially script-based web downloads remain the primary delivery methods. The .rar and .zip archives (4 total) suggest some samples are still being delivered as compressed attachments. No evidence of exploit kit delivery or SMS-based distribution was observed today.
Detection Rate
With 42 new IOCs added, detection rates for today’s samples are uncertain. Static signatures for JavaScript and PowerShell payloads are often less reliable than for standalone EXEs. The unusual .93763227 file may evade current detections entirely until it is properly analyzed and classified.
C2 Infrastructure
No new C2 servers were identified today, aligning with the lower sample volume. Existing C2 infrastructure appears to be reused from previous campaigns with no geographic shift observed. The lack of new domains or IPs suggests operators are not expanding their command network.
7-Day Trend
Today’s 37% decline relative to the 7-day average confirms a cooling trend after likely peak activity earlier in the week. If tomorrow’s count remains below 50, this lull may extend into a sustained decrease.
Security Analysis
The unexpected .93763227 file extension is a notable anomaly; it may represent a custom obfuscation technique or a file renamed to bypass email filters. Attackers often test novel file extensions during low-volume periods before incorporating them into larger campaigns. Defenders should immediately monitor for this extension in email gateways and web logs. Recommendation: Deploy email rules to block or quarantine any attachment with the .93763227 extension until its behavior is confirmed, and review JavaScript execution policies on user endpoints.