We have encountered a trojan that has modified both cmd.exe and ntdll.dll on a Windows 2000 machine. The files failed our CRC check (TDS was used for this, these out of 29 CRC-checked files were flagged as modified and Windows also flagged it). It was installed on a well protected machine (behind a firewall, zone alarm, Norton anti-virus, locked-down) and believe the application installing it was either a vendor-installed patch this morning (we have notified the vendor and are getting their feedback and verifying) or through a web-based IE exploit on a fully patched IE installation. No email attachments were opened on this machine, etc, that would have caused the infection Has anyone on this list encountered a trojan specifically targetting BOTH of these files? Clearly many target cmd.exe and both (cmd.exe and ntdll.dll) are great candidates for modification by a hacker. Cmd.exe has of course been swapped-out since the beginning of time. We'd like to learn more about the signature of this particular one. ---------------------------------------------------------------------------- *** Wireless LAN Policies for Security & Management - NEW White Paper *** Just like wired networks, wireless LANs require network security policies that are enforced to protect WLANs from known vulnerabilities and threats. Learn to design, implement and enforce WLAN security policies to lockdown enterprise WLANs. To get your FREE white paper visit us at: http://www.securityfocus.com/AirDefense-incidents ----------------------------------------------------------------------------
This archive was generated by hypermail 2b30 : Thu May 15 2003 - 21:38:27 PDT