This technical note discusses a relatively undocumented implant used by the APT10 group. This is named “Red Leaves” after strings found in the malware. The sample discussed was found during an incident response engagement in March 2017. The earliest evidence obtained shows it has been in use since at least November 2016.

This technical note discusses a version of Sakula uploaded to VirusTotal on the 25th April 2016. The sample initially looked interesting as it uses a signed Kaspersky binary to load itself, presumably to avoid UAC.

In March Microsoft published security advisory 2953095, detailing a remote code execution vulnerability in multiple versions of Microsoft Office (CVE-2014-1761). A Technet blog was released at the same time which contained excellent information on how a typical malicious document would be constructed. NCC Group’s Cyber Defence Operations team used the information in the Technet blog to identify a malicious document within our malware zoo that exploited this vulnerability which appears to have been used in a targeted attack. In this blog we show one method of analysing the shellcode manually to extract the payload.