Socket has flagged a malicious NuGet package, Sicoob.Sdk (versions 2.0.0-2.0.4), that masquerades as a C# SDK for Sicoob, one of Brazil's largest cooperative financial systems, and steals PFX certificates used to authenticate businesses with Sicoob's banking APIs. When a developer instantiates SicoobClient, the package reads the PFX file from disk, Base64-encodes it, and exfiltrates the client ID, PFX password, and encoded certificate to a hardcoded third-party Sentry endpoint. It also captures raw Boleto API responses. The package was downloaded ~500 times and the publisher has 11 other NuGet packages with ~6,000 combined downloads. Google Search AI Mode reportedly amplified the package as legitimate.
Researchers disclosed TCLBANKER, an Android banking trojan that adds worm-style self-propagation: once installed, it abuses Accessibility Services to read the victim's WhatsApp and Outlook contact lists and then send malicious download links to every contact as if from the victim. The malware targets banking and crypto-wallet apps with overlay screens that capture credentials, plus SMS-interception modules that grab one-time passcodes. Self-spreading via the victim's own messaging history defeats traditional URL-reputation controls. The campaign concentrates in Brazil, Spain, and Italy banking apps initially. Operators are renting access on Telegram for $1,500-3,000/month.
TrustStrike Labs