Monday, October 18, 2021

Worm.Win32.Fasong.c Unquoted Service Path

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/bc6f4a283b6b8308c60bb70cc81edfd8.txt
Contact: [email protected]
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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