In recent months, CPR has been investigating the usage of compiled V8 JavaScript by malware authors. Compiled V8 JavaScript is a lesser-known feature in V8, Google’s JavaScript engine, that enables the compilation of JavaScript into low-level bytecode.
This technique assists attackers in evading static detections and hiding their original source code, rendering it almost impossible to analyze statically. To statically analyze compiled JavaScript files, Check Point researchers employed a newly-developed custom tool named ”View8”, specifically designed for decompiling V8 bytecode to a high-level readable language. Using View8, they decompiled thousands of malicious compiled V8 applications, spanning various malware types, such as Remote Access Tools (RATs), stealers, miners and even ransomware.
Read more…
Source: Check Point
Related:
- New Tool Set Found Used Against Organizations in the Middle East, Africa and the US
December 1, 2023
Unit 42 researchers observed a series of apparently related attacks against organizations in the Middle East, Africa and the U.S. The researchers will discuss a set of tools used in the course of the attacks that reveal clues about the threat actors’ activity. Unit 42 team is sharing this research to provide detection, prevention and hunting ...
- AeroBlade on the hunt targeting the U.S. Aerospace industry
November 30, 2023
BlackBerry has uncovered a previously unknown threat actor targeting an aerospace organization in the United States, with the apparent goal of conducting commercial and competitive cyber espionage. The BlackBerry Threat Research and Intelligence team is tracking this threat actor as AeroBlade. The actor used spear-phishing as a delivery mechanism: A weaponized document, sent as an email ...
- Hellhounds: Operation Lahat
November 30, 2023
In 2023, Positive Technologies Computer Security Incident Response Team (PT CSIRT) discovered that a certain power company was compromised by the Decoy Dog trojan. According to the PT CSIRT investigation, Decoy Dog has been actively used in cyberattacks on Russian companies and government organizations since at least September 2022. This trojan was previously discussed by NCIRCC, Infoblox, ...
- Spyware Employs Various Obfuscation Techniques to Bypass Static Analysis
November 29, 2023
With the surging popularity of mobile applications, the landscape of cybersecurity is encountering increasingly intricate and discreet forms of malicious software. One common strategy in the realm of cybersecurity is code obfuscation. This practice involves the deliberate alteration of various elements within the code, such as variables, functions, and class names, rendering them virtually indecipherable. This ...
- Israel-Hamas war spotlight: Shaking the rust off SysJoker
November 23, 2023
Amid tensions in the ongoing Israel-Hamas war, Check Point Research has been conducting active threat hunting in an effort to discover, attribute, and mitigate relevant regional threats. Among those, some new variants of the SysJoker malware, including one coded in Rust, recently caught our attention. Check Point assessment is that these were used in targeted attacks ...
- HrServ – Previously unknown web shell used in APT attack
November 22, 2023
In the course of our routine investigation, we discovered a DLL file, identified as hrserv.dll, which is a previously unknown web shell exhibiting sophisticated features such as custom encoding methods for client communication and in-memory execution. Kaspersky analysis of the sample led to the discovery of related variants compiled in 2021, indicating a potential correlation between ...