Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

News

4/19/2021
04:30 PM
50%
50%

Lazarus Group Uses New Tactic to Evade Detection

Attackers conceal malicious code within a BMP file to slip past security tools designed to detect embedded objects within images.

Security researchers with Malwarebytes have observed North Korea-affiliated advanced persistent threat actor Lazarus Group employing a new technique to deliver malware while evading security tools.

Related Content:

US Unseals Indictments Against North Korean Cyberattackers for Thefts Totaling $1.3B

Special Report: How Data Breaches Affect the Enterprise

New From The Edge: How to Create an Incident Response Plan From the Ground Up

Lazarus Group, an active and sophisticated group known for attacking targets around the world, recently expanded its primary mission beyond monetary theft to include stealing defense secrets. The group is known for developing custom malware families and using novel tactics.

One of its newest methods involves embedding a malicious HTML Application (HTA) file within a compressed zlib file, within a PNG file. During run time, the PNG file is converted into a BMP file format. Because the BMP file is uncompressed, converting from PNG to BMP automatically decompresses the malicious zlib object. Researchers call this a clever way to evade detection. Because the malicious object is compressed within the PNG image, it bypasses static detection.

This attack likely started with a phishing campaign in which emails arrives with a malicious file attached. When opened, the file prompts its viewer to enable macros. Doing this will lead to a message box; clicking this will load the final phishing lure — a participation form for a fair in a South Korean city. The document is weaponized with a macro that executes when it's opened.

While attribution is consistently a challenge in cyberattacks, the team found several signs that connect this activity with Lazarus Group, as outlined in a blog post on their findings.

"There are several similarities between this attack and past Lazarus operations and we believe these are strong indicators to attribute this attack to the Lazarus threat actor," writes Hossein Jazi, senior threat intelligence analyst.

Read the full blog post for more information.

Dark Reading's Quick Hits delivers a brief synopsis and summary of the significance of breaking news events. For more information from the original source of the news item, please follow the link provided in this article. View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Commentary
Cyberattacks Are Tailored to Employees ... Why Isn't Security Training?
Tim Sadler, CEO and co-founder of Tessian,  6/17/2021
Edge-DRsplash-10-edge-articles
7 Powerful Cybersecurity Skills the Energy Sector Needs Most
Pam Baker, Contributing Writer,  6/22/2021
News
Microsoft Disrupts Large-Scale BEC Campaign Across Web Services
Kelly Sheridan, Staff Editor, Dark Reading,  6/15/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
The State of Cybersecurity Incident Response
In this report learn how enterprises are building their incident response teams and processes, how they research potential compromises, how they respond to new breaches, and what tools and processes they use to remediate problems and improve their cyber defenses for the future.
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2021-32716
PUBLISHED: 2021-06-24
Shopware is an open source eCommerce platform. In versions prior to 6.4.1.1 the admin api has exposed some internal hidden fields when an association has been loaded with a to many reference. Users are recommend to update to version 6.4.1.1. You can get the update to 6.4.1.1 regularly via the Auto-U...
CVE-2021-32717
PUBLISHED: 2021-06-24
Shopware is an open source eCommerce platform. In versions prior to 6.4.1.1 private files publicly accessible with Cloud Storage providers when the hashed URL is known. Users are recommend to first change their configuration to set the correct visibility according to the documentation. The visibilit...
CVE-2021-32712
PUBLISHED: 2021-06-24
Shopware is an open source eCommerce platform. Versions prior to 5.6.10 are vulnerable to system information leakage in error handling. Users are recommend to update to version 5.6.10. You can get the update to 5.6.10 regularly via the Auto-Updater or directly via the download overview.
CVE-2021-32713
PUBLISHED: 2021-06-24
Shopware is an open source eCommerce platform. Versions prior to 5.6.10 suffer from an authenticated stored XSS in administration vulnerability. Users are recommend to update to the version 5.6.10. You can get the update to 5.6.10 regularly via the Auto-Updater or directly via the download overview.
CVE-2021-32710
PUBLISHED: 2021-06-24
Shopware is an open source eCommerce platform. Potential session hijacking of store customers in versions below 6.3.5.2. We recommend to update to the current version 6.3.5.2. You can get the update to 6.3.5.2 regularly via the Auto-Updater or directly via the download overview. For older versions o...