Rapid7 has observed an ongoing campaign to distribute trojanized installers for WinSCP and PuTTY via malicious ads on commonly used search engines, where clicking on the ad leads to typo squatted domains.
Every version of the PuTTY tools from 0.68 to 0.80 inclusive has a critical vulnerability in the code that generates signatures from ECDSA private keys which use the NIST P521 curve. (PuTTY, or Pageant, generates a signature from a key when using it to authenticate you to an SSH server.)
A malicious ad for the popular admin tool PuTTY leads victims to a fake site that downloads malware.
