Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/b1cec4b806c71c82bbd9002bdaf21d1f_B.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: Backdoor.Win32.Surila.j Vulnerability: Authentication Bypass Description: The malware listens on random TCP high port numbers typically starting with "1" E.g. 12356, 14985, 13850, 19050, 13137. Third-party attackers who can reach infected systems can logon using any username/password combination. Type: PE32 MD5: b1cec4b806c71c82bbd9002bdaf21d1f Vuln ID: MVID-2021-0289 Dropped files: iexp1orer.exe Disclosure: 07/12/2021 Exploit/PoC: nc64.exe x.x.x.x 13137 220 Bot Server (Win32) USER mal 331 Password required. PASS vuln 230 Login successful. Have fun. SYST 215 UNIX Type: L8 Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).