Attackers typically try to pass off malware as legitimate applications or as potentially unwanted programs that users deliberately search for and download, such as cheats or cracks. They often rely on ad and affiliate networks to deliver their creations to victims’ devices. This post examines a less conventional case: a well-known backdoor distributed under the guise of adware. The attackers may have chosen this distribution method because the adware was signed by the developer. On top of that, users often manually add these apps to exclusions, so their useful features don’t get blocked.
Some time ago, a client asked us to analyze a file with the MD5 hash c24e99f9437feacaa63766a3cde3fe3d and add it to our detection database. We initially classified it as adware, but a cursory analysis turned up suspicious network activity, which prompted us to dig deeper. It turned out the sample did far more than serve ads. In fact, its advertising functionality doesn’t even work; instead, it triggers an infection chain that delivers the ValleyRAT backdoor.
Read more…
Source: Kaspersky
Sign up for the Cyber Security Review Newsletter
The latest cyber security news and insights delivered right to your inbox
Related:
- K-12 schools improve protection against online attacks, but many are vulnerable to ransomware gangs
November 19, 2023
Some K-12 public schools are racing to improve protection against the threat of online attacks, but lax cybersecurity means thousands of others are vulnerable to ransomware gangs that can steal confidential data and disrupt operations. Since a White House conference in August on ransomware threats, dozens of school districts have signed up for free cybersecurity services, ...
- Canada: Current and former public service, RCMP, military members affected by data breach
November 18, 2023
The federal government is warning current and former public service employees and members of the RCMP and Canadian Armed Forces their personal and financial information may have been accessed in a data breach that occurred on Oct. 19. The breach affects federal government data held by Brookfield Global Relocation Services (BGRS) and SIRVA Worldwide Relocation & ...
- Toyota finance business confirms ransomware attack, data breach
November 18, 2023
Toyota Financial Services (TFS), a subsidiary of the popular automaker, has confirmed suffering a ransomware attack. In a statement company stated that Toyota Financial Services Europe & Africa “recently identified unauthorized activity on systems in a limited number of its locations.” The company only mentioned unauthorized activity on its endpoints and didn’t discuss if any data ...
- Stately Taurus targets the Philippines as tensions flare in the South Pacific
November 17, 2023
Tensions between China and the Philippines have risen sharply over the past several months. Coinciding with these real-world events, Unit 42 researchers observed three Stately Taurus campaigns during the month of August. These campaigns are assessed to have targeted entities in the South Pacific including the Philippines government. The campaigns leveraged legitimate software including Solid PDF ...
- Into The Trash: Analyzing LitterDrifter
November 17, 2023
Gamaredon, also known as Primitive Bear, ACTINIUM, and Shuckworm, is a unique player in the Russian espionage ecosystem that targets a wide variety of almost exclusively Ukrainian entities. While researchers often struggle to uncover evidence of Russian espionage activities, Gamaredon is notably conspicuous. The group behind it conducts large-scale campaigns while still primarily focusing on regional ...
- Scattered Spider
November 16, 2023
The Federal Bureau of Investigation (FBI) and Cybersecurity and Infrastructure Security Agency (CISA) are releasing this joint Cybersecurity Advisory (CSA) in response to recent activity by Scattered Spider threat actors against the commercial facilities sectors and subsectors. This advisory provides tactics, techniques, and procedures (TTPs) obtained through FBI investigations as recently as November 2023. Scattered Spider ...