Silver Fox uses the new ABCDoor backdoor to target organizations in Russia and India

Reported 30 Apr 2026 by otx · Severity: medium

The Silver Fox threat group conducted phishing campaigns in December 2025 and January 2026, impersonating tax authorities in India and Russia. Malicious emails contained archives with a modified Rust-based RustSL loader that deployed ValleyRAT backdoor. Over 1600 malicious emails