gavrill.exe detected? Yes, we have detection.

[polonus]

See: http://urlquery.net/report.php?id=1434899737570
Detailed analysis: https://www.sophos.com/en-us/threat-center/threat-analyses/viruses-and-spyware/Troj~Inject-BHG/detailed-analysis.aspx
See: https://malwr.com/analysis/NDZkMTYzMGNkZDhhNGM4OWI2ZTBkNDRlY2QyM2NmNDk/
see: http://www.geocities.co.jp/Playtown-Yoyo/6130/malware/report_b0376289544229190750bca07297896e.html
Indeed Avast detects: https://www.virustotal.com/en-gb/file/e5f63f28c5843e28d867c075f6f409028e668d6e43a6df44f055d3333cb8ec77/analysis/

polonus