Worm.Win32.Fasong.c / Insecure Service Path

[malvuln <malvuln13 () gmail com>]

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/bc6f4a283b6b8308c60bb70cc81edfd8.txt
Contact: malvuln13 () gmail com
Media: twitter.com/malvuln

Threat: Worm.Win32.Fasong.c
Vulnerability: Insecure Service Path
Description: The malware creates a service with an unquoted path. Third
party attackers who can place an arbitrary executable under c:\ drive can
potentially undermine the integrity of the malware by having it run theirs
instead with SYSTEM privs.
Type: PE32
MD5: bc6f4a283b6b8308c60bb70cc81edfd8
Vuln ID: MVID-2021-0363
Dropped files: QIRNJ.EXE
Disclosure: 10/15/2021


Exploit/PoC:
C:\>sc qc VGUPL.EXE
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: VGUPL.EXE
        TYPE               : 110  WIN32_OWN_PROCESS (interactive)
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : C:\Program Files (x86)\VGUPL.EXE
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : VGUPL.EXE
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem


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