Entries Tagged "malware"

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Screenshot-Reading Malware

Kaspersky is reporting on a new type of smartphone malware.

The malware in question uses optical character recognition (OCR) to review a device’s photo library, seeking screenshots of recovery phrases for crypto wallets. Based on their assessment, infected Google Play apps have been downloaded more than 242,000 times. Kaspersky says: “This is the first known case of an app infected with OCR spyware being found in Apple’s official app marketplace.”

That’s a tactic I have not heard of before.

Posted on February 7, 2025 at 10:26 AM • View Comments

Fake Reddit and WeTransfer Sites Are Pushing Malware

There are thousands of fake Reddit and WeTransfer webpages that are pushing malware. They exploit people who are using search engines to search sites like Reddit.

Unsuspecting victims clicking on the link are taken to a fake WeTransfer site that mimicks the interface of the popular file-sharing service. The ‘Download’ button leads to the Lumma Stealer payload hosted on “weighcobbweo[.]top.”

Boing Boing post.

Posted on January 30, 2025 at 7:44 AM • View Comments

New VPN Backdoor

A newly discovered VPN backdoor uses some interesting tactics to avoid detection:

When threat actors use backdoor malware to gain access to a network, they want to make sure all their hard work can’t be leveraged by competing groups or detected by defenders. One countermeasure is to equip the backdoor with a passive agent that remains dormant until it receives what’s known in the business as a “magic packet.” On Thursday, researchers revealed that a never-before-seen backdoor that quietly took hold of dozens of enterprise VPNs running Juniper Network’s Junos OS has been doing just that.

J-Magic, the tracking name for the backdoor, goes one step further to prevent unauthorized access. After receiving a magic packet hidden in the normal flow of TCP traffic, it relays a challenge to the device that sent it. The challenge comes in the form of a string of text that’s encrypted using the public portion of an RSA key. The initiating party must then respond with the corresponding plaintext, proving it has access to the secret key.

The lightweight backdoor is also notable because it resided only in memory, a trait that makes detection harder for defenders. The combination prompted researchers at Lumin Technology’s Black Lotus Lab to sit up and take notice.

[…]

The researchers found J-Magic on VirusTotal and determined that it had run inside the networks of 36 organizations. They still don’t know how the backdoor got installed.

Slashdot thread.

EDITED TO ADD (2/1): Another article.

Posted on January 27, 2025 at 7:02 AM • View Comments

FBI Deletes PlugX Malware from Thousands of Computers

According to a DOJ press release, the FBI was able to delete the Chinese-used PlugX malware from “approximately 4,258 U.S.-based computers and networks.”

Details:

To retrieve information from and send commands to the hacked machines, the malware connects to a command-and-control server that is operated by the hacking group. According to the FBI, at least 45,000 IP addresses in the US had back-and-forths with the command-and-control server since September 2023.

It was that very server that allowed the FBI to finally kill this pesky bit of malicious software. First, they tapped the know-how of French intelligence agencies, which had recently discovered a technique for getting PlugX to self-destruct. Then, the FBI gained access to the hackers’ command-and-control server and used it to request all the IP addresses of machines that were actively infected by PlugX. Then it sent a command via the server that causes PlugX to delete itself from its victims’ computers.

Posted on January 16, 2025 at 7:03 AM • View Comments

Detecting Pegasus Infections

This tool seems to do a pretty good job.

The company’s Mobile Threat Hunting feature uses a combination of malware signature-based detection, heuristics, and machine learning to look for anomalies in iOS and Android device activity or telltale signs of spyware infection. For paying iVerify customers, the tool regularly checks devices for potential compromise. But the company also offers a free version of the feature for anyone who downloads the iVerify Basics app for $1. These users can walk through steps to generate and send a special diagnostic utility file to iVerify and receive analysis within hours. Free users can use the tool once a month. iVerify’s infrastructure is built to be privacy-preserving, but to run the Mobile Threat Hunting feature, users must enter an email address so the company has a way to contact them if a scan turns up spyware—as it did in the seven recent Pegasus discoveries.

Posted on December 6, 2024 at 7:09 AM • View Comments

Perfectl Malware

Perfectl in an impressive piece of malware:

The malware has been circulating since at least 2021. It gets installed by exploiting more than 20,000 common misconfigurations, a capability that may make millions of machines connected to the Internet potential targets, researchers from Aqua Security said. It can also exploit CVE-2023-33246, a vulnerability with a severity rating of 10 out of 10 that was patched last year in Apache RocketMQ, a messaging and streaming platform that’s found on many Linux machines.

The researchers are calling the malware Perfctl, the name of a malicious component that surreptitiously mines cryptocurrency. The unknown developers of the malware gave the process a name that combines the perf Linux monitoring tool and ctl, an abbreviation commonly used with command line tools. A signature characteristic of Perfctl is its use of process and file names that are identical or similar to those commonly found in Linux environments. The naming convention is one of the many ways the malware attempts to escape notice of infected users.

Perfctl further cloaks itself using a host of other tricks. One is that it installs many of its components as rootkits, a special class of malware that hides its presence from the operating system and administrative tools. Other stealth mechanisms include:

  • Stopping activities that are easy to detect when a new user logs in
  • Using a Unix socket over TOR for external communications
  • Deleting its installation binary after execution and running as a background service thereafter
  • Manipulating the Linux process pcap_loop through a technique known as hooking to prevent admin tools from recording the malicious traffic
  • Suppressing mesg errors to avoid any visible warnings during execution.

The malware is designed to ensure persistence, meaning the ability to remain on the infected machine after reboots or attempts to delete core components. Two such techniques are (1) modifying the ~/.profile script, which sets up the environment during user login so the malware loads ahead of legitimate workloads expected to run on the server and (2) copying itself from memory to multiple disk locations. The hooking of pcap_loop can also provide persistence by allowing malicious activities to continue even after primary payloads are detected and removed.

Besides using the machine resources to mine cryptocurrency, Perfctl also turns the machine into a profit-making proxy that paying customers use to relay their Internet traffic. Aqua Security researchers have also observed the malware serving as a backdoor to install other families of malware.

Something this complex and impressive implies that a government is behind this. North Korea is the government we know that hacks cryptocurrency in order to fund its operations. But this feels too complex for that. I have no idea how to attribute this.

Posted on October 14, 2024 at 7:06 AM • View Comments

New Windows Malware Locks Computer in Kiosk Mode

Clever:

A malware campaign uses the unusual method of locking users in their browser’s kiosk mode to annoy them into entering their Google credentials, which are then stolen by information-stealing malware.

Specifically, the malware “locks” the user’s browser on Google’s login page with no obvious way to close the window, as the malware also blocks the “ESC” and “F11” keyboard keys. The goal is to frustrate the user enough that they enter and save their Google credentials in the browser to “unlock” the computer.

Once credentials are saved, the StealC information-stealing malware steals them from the credential store and sends them back to the attacker.

I’m sure this works often enough to be a useful ploy.

Posted on September 25, 2024 at 7:00 AM • View Comments

Python Developers Targeted with Malware During Fake Job Interviews

Interesting social engineering attack: luring potential job applicants with fake recruiting pitches, trying to convince them to download malware. From a news article:

These particular attacks from North Korean state-funded hacking team Lazarus Group are new, but the overall malware campaign against the Python development community has been running since at least August of 2023, when a number of popular open source Python tools were maliciously duplicated with added malware. Now, though, there are also attacks involving “coding tests” that only exist to get the end user to install hidden malware on their system (cleverly hidden with Base64 encoding) that allows remote execution once present. The capacity for exploitation at that point is pretty much unlimited, due to the flexibility of Python and how it interacts with the underlying OS.

Posted on September 17, 2024 at 7:02 AM • View Comments

The Justice Department Took Down the 911 S5 Botnet

The US Justice Department has dismantled an enormous botnet:

According to an indictment unsealed on May 24, from 2014 through July 2022, Wang and others are alleged to have created and disseminated malware to compromise and amass a network of millions of residential Windows computers worldwide. These devices were associated with more than 19 million unique IP addresses, including 613,841 IP addresses located in the United States. Wang then generated millions of dollars by offering cybercriminals access to these infected IP addresses for a fee.

[…]

This operation was a coordinated multiagency effort led by law enforcement in the United States, Singapore, Thailand, and Germany. Agents and officers searched residences, seized assets valued at approximately $30 million, and identified additional forfeitable property valued at approximately $30 million. The operation also seized 23 domains and over 70 servers constituting the backbone of Wang’s prior residential proxy service and the recent incarnation of the service. By seizing multiple domains tied to the historical 911 S5, as well as several new domains and services directly linked to an effort to reconstitute the service, the government has successfully terminated Wang’s efforts to further victimize individuals through his newly formed service Clourouter.io and closed the existing malicious backdoors.

The creator and operator of the botnet, YunHe Wang, was arrested in Singapore.

Three news articles.

Posted on June 7, 2024 at 7:04 AM • View Comments

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Sidebar photo of Bruce Schneier by Joe MacInnis.