Bogus web sites promoting Google Chrome have been used to distribute malicious installers for a distant entry trojan known as ValleyRAT.
The malware, first detected in 2023, is attributed to a risk actor tracked as Silver Fox, with prior assault campaigns primarily focusing on Chinese language-speaking areas like Hong Kong, Taiwan, and Mainland China.
“This actor has more and more focused key roles inside organizations—significantly in finance, accounting, and gross sales division — highlighting a strategic deal with high-value positions with entry to delicate information and programs,” Morphisec researcher Shmuel Uzan stated in a report revealed earlier this week.
Early assault chains have been noticed delivering ValleyRAT alongside different malware households reminiscent of Purple Fox and Gh0st RAT, the latter of which has been extensively used by varied Chinese language hacking teams.
As just lately as final month, counterfeit installers for official software program have served as a distribution mechanism for the trojan by way of a DLL loader named PNGPlug.
It is value noting {that a} drive-by obtain scheme focusing on Chinese language-speaking Home windows customers was beforehand used to deploy Gh0st RAT utilizing malicious installer packages for the Chrome internet browser.
Similarly, the newest assault sequence related to ValleyRAT entails using a faux Google Chrome web site to trick targets into downloading a ZIP archive containing an executable (“Setup.exe”).
The binary, upon execution, checks if it has administrator privileges after which proceeds to obtain 4 further payloads, together with a official executable related to Douyin (“Douyin.exe”), the Chinese language model of TikTok, that is used to sideload a rogue DLL (“tier0.dll”), which then launches the ValleyRAT malware.
Additionally retrieved is one other DLL file (“sscronet.dll”), which is accountable for terminating any working course of current in an exclusion checklist.
Compiled in Chinese language and written in C++, ValleyRAT is a trojan that is designed to watch display screen content material, log keystrokes, and set up persistence on the host. It is also able to initiating communications with a distant server to await additional directions that enable it to enumerate processes, in addition to obtain and execute arbitrary DLLs and binaries, amongst others.
“For payload injection, the attacker abused official signed executables that have been susceptible to DLL search order hijacking,” Uzan stated.
The event comes as Sophos shared particulars of phishing assaults that make use of Scalable Vector Graphics (SVG) attachments to evade detection and ship an AutoIt-based keystroke logger malware like Nymeria or direct customers to credential harvesting pages.
