直接用IDA打开，居然连输出的字符串都找不到…于是通过strings发现文件是被UPX压缩了。下载UPX，用upx -d flag解压缩后，直接找到flag地址。或者再用strings Previous collision Next input FEATURED TAGS HTTP wechall PHP linux sql exploit crypto OverTheWire reverse how-to binary pwnable.kr ksnctf misc android webhacking.kr fuzzing