evasion techniques Archives

AppWizard

August 4, 2026

DoubleVerify finds dozens of Android apps a month showing ads after calls

A recent analysis by DoubleVerify engineers has identified a trend in mobile advertising known as AfterCall ads, where applications display advertisements immediately after a phone call ends. This practice generates hundreds of millions of impressions monthly and raises concerns about user experience and brand integrity. AfterCall applications operate using three components: a misleading permission, a Broadcast Receiver to capture end-of-call events, and an Activity to display ads. The SYSTEMALERTWINDOW permission allows these apps to show content over others, often granted under false pretenses. They utilize Android's telephony system to trigger ads post-call and employ tactics to obscure their presence, such as removing themselves from the recent apps list and using innocuous icons. Detection is challenging due to the lack of shared codebases and the obfuscation techniques used. The scale of the issue is significant, with numerous AfterCall applications identified monthly, negatively impacting user experience and raising concerns for advertisers.

AppWizard

July 23, 2026

Active Exploitation Alert: Fake Bahrain Alert App Deploys Advanced Android Surveillance Malware Targeting Gulf Region Users

A cyber-espionage campaign has been identified involving a counterfeit Bahrain Alert Android application designed to surveil individuals in Bahrain and the Gulf region. The app masquerades as an official civil defense tool and employs social engineering tactics to compromise Android devices, extract sensitive data, and maintain remote access. It targets high-value individuals such as activists and journalists, particularly during civil unrest and missile alerts, leveraging trusted government branding to increase infection rates. The malware features a complex, multi-stage architecture with advanced evasion techniques and is distributed through phishing links and malicious websites. It initiates a four-stage infection process, ultimately installing a remote access trojan (RAT) that enables covert surveillance and encrypted communications. The malware can monitor device activity, capture credentials, and intercept communications, while also employing mechanisms to avoid detection and maintain persistence. The campaign primarily targets Bahraini citizens, exploiting fear during crises to encourage app installation. Although there are indications of Russian-speaking developers involved, there is no definitive attribution to a specific nation-state or APT group. Mitigation strategies include monitoring for suspicious app installations, user education on verifying app authenticity, and blocking known malicious domains.

Winsage

June 24, 2026

Windows RAT Uses Encrypted HTTP C2 and Registry Persistence After npm Infection

A malware campaign targets Windows systems through a malicious npm package named postcss-minify-selector-parser, which mimics the legitimate postcss-selector-parser. This counterfeit package installs a Remote Access Trojan (RAT) on developer machines, beginning with a multi-stage attack triggered by the installation of the package. The RAT can steal credentials, execute shell commands, and communicate with a remote attacker. Security researchers at JFrog identified this threat and reported it on June 22, 2026, noting that two additional related packages, postcss-minify-selector and aes-decode-runner-pro, are linked to the same publisher and remain live on the npm registry. The RAT employs encrypted HTTP communication with a command-and-control (C2) server and ensures persistence by creating a registry key under the Windows Run key. It has capabilities for remote shell execution, file uploads and downloads, and can steal saved login data from Google Chrome using Windows decryption APIs. The malware is designed for organized batch exfiltration of stolen data. Indicators of compromise include specific IP addresses, domains, file paths, and SHA-256 hashes associated with the malware components. JFrog advises users to remove the malicious packages, inspect their dependency trees, and treat any stored credentials as compromised.

Winsage

June 19, 2026

Microsoft Details Windows Clipper Malware Campaign Using USB LNK Worm and Tor-Based C2

Microsoft has identified a Windows-based cryptocurrency clipper campaign that has been active since February 2026. This campaign uses clipboard-intercepting malware with self-spreading capabilities and operates through the Tor network. The clipper malware employs Windows Script Host and ActiveX to launch a Tor proxy and connect to a hidden command-and-control server. It focuses on stealing clipboard data, particularly cryptocurrency wallet addresses, and can exfiltrate screenshots. The malware is distributed via malicious Windows Shortcut (LNK) files on USB drives, which activate a worm that checks for existing infections and fetches the payload from a remote server. The clipper monitors the clipboard every 500 milliseconds for sensitive information and can replace copied wallet addresses with those controlled by attackers. Microsoft recommends behavioral detections, disabling AutoRun for removable media, blocking LNK execution from drives, and monitoring clipboard-related activities as mitigations against this threat.

Winsage

June 2, 2026

New PHANTOMPULSE RAT Campaign Uses UAC Bypass in Windows Attacks

The REF6598 intrusion set has revealed a Remote Access Trojan (RAT) named PHANTOMPULSE, which is distributed via malicious Obsidian plugins. It uses advanced evasion techniques, including a blockchain-based command and control (C2) channel and a public User Account Control (UAC) bypass to infiltrate Windows systems. The malware disables security measures like the Antimalware Scan Interface (AMSI) and Windows Lockdown Policy (WLDP) through a hardware-breakpoint technique, allowing it to avoid detection by signature-based memory scanners. PHANTOMPULSE hides its core files in encrypted registry blobs and creates scheduled tasks that appear as .NET Framework updates. Its decentralized C2 framework queries public blockchains for operational data, but it lacks sender authentication, which can be exploited by defenders. The malware inventories the system for antivirus software and targets high-value applications. It employs a UAC bypass technique called “schuac” to gain elevated permissions. Analysts attribute this campaign to DPRK-aligned threat actors, particularly the BlueNoroff group, due to its focus on cryptocurrency wallets and blockchain exploitation. Defenders can identify new infrastructure by searching blockchain ledgers for a specific hex signature associated with the malware's C2 encryption routine.

AppWizard

May 20, 2026

Trapdoor Android Ad Fraud Scheme Hit 659 Million Daily Bid Requests Using 455 Apps

Cybersecurity researchers have identified an ad fraud and malvertising operation called Trapdoor, targeting Android users with 455 malicious applications and 183 command-and-control domains. Users often download these disguised apps, which initiate malvertising campaigns and lead to further downloads of malicious applications. At its peak, Trapdoor generated 659 million bid requests daily, with over 24 million downloads of the associated apps, primarily from the United States. The operation exploits install attribution tools to activate malicious activities only for users acquired through fraudulent ad campaigns, while suppressing such behavior for organic downloads. Trapdoor employs advanced evasion techniques, including obfuscation and impersonation of legitimate software, to avoid detection. Google has removed the identified malicious apps from the Play Store in response to the threat.

AppWizard

April 30, 2026

LofyStealer Uses Node.js Loader Against Minecraft Gamers

Cybersecurity threat hunters have discovered an active infostealer campaign targeting the gaming community, involving malware called LofyStealer (or GrabBot) that disguises itself as a Minecraft hack named “Slinky.” The attackers use the official game icon to trick young gamers into executing the malware. The Brazilian cybercrime group LofyGang has enhanced its technical capabilities, utilizing a sophisticated two-stage modular architecture. The initial stage features a 53.5 MB loader file named load.exe, which is a Node.js runtime environment that obscures malicious signatures. The loader connects to the attacker’s server and decrypts a 1.4 MB C++ payload, chromelevator.exe, which targets eight web browsers to extract sensitive information like cookies and passwords. The stolen data is compressed, encrypted, and sent to the attacker’s server. LofyGang has evolved into a Malware-as-a-Service platform, offering a web panel for operators to monitor victims and generate custom executables. The campaign highlights the increasing threats to the gaming community, with advanced evasion techniques being employed by cybercriminals. Security professionals are advised to monitor network traffic and conduct audits for suspicious activities.

Tech Optimizer

March 27, 2026

Bogus Avast website fakes virus scan, installs Venom Stealer instead

A deceptive website impersonating Avast antivirus tricks users into downloading Venom Stealer malware, which steals passwords, session cookies, and cryptocurrency wallet information. The site conducts a fake virus scan, falsely reporting threats to encourage users to download a malicious file named Avastsystemcleaner.exe. This file mimics legitimate software and operates stealthily, targeting web browsers to harvest credentials and session cookies. It also captures screenshots and sends stolen data to the command-and-control domain app-metrics-cdn[.]com via unencrypted HTTP. The malware employs evasion techniques to avoid detection and is part of a long-standing cybercrime tactic that exploits user trust in security software. Indicators of compromise include the file hash SHA-256: ecbeaa13921dbad8028d29534c3878503f45a82a09cf27857fa4335bd1c9286d, the domain app-metrics-cdn[.]com, and the network indicator 104.21.14.89.

AppWizard

March 12, 2026

Six Android Malware Families Target Pix Payments, Banking Apps, and Crypto Wallets

Cybersecurity researchers have identified six new families of Android malware designed to extract sensitive data and facilitate financial fraud. Notable threats include: - PixRevolution: Targets Brazil's Pix payment platform, activates during Pix transfers, and uses real-time monitoring to intervene in transactions. Victims are tricked into installing malicious apps from counterfeit Google Play Store listings, which enable accessibility services for the malware to capture screens and overlay fake interfaces to reroute funds. - BeatBanker: Spreads through phishing attacks disguised as legitimate Google Play Store pages. It uses an inaudible audio loop for persistence, functions as a banking trojan, and includes a cryptocurrency miner. It creates deceptive overlays for platforms like Binance and Trust Wallet to divert funds and can monitor web browsers and execute remote commands. - TaxiSpy RAT: Exploits accessibility services to gather sensitive information such as SMS messages and call logs, targeting banking and cryptocurrency applications with overlays for credential theft. It employs advanced evasion techniques like native library encryption and real-time remote control. - Mirax: A private malware-as-a-service (MaaS) offering with a subscription model that provides tools for banking overlays and information gathering, including keystrokes and SMS. - Oblivion: Another Android RAT available at a competitive price, featuring capabilities to bypass security measures on various devices. - SURXRAT: Distributed through a Telegram-based MaaS ecosystem, it uses accessibility permissions for persistent control and communicates with a Firebase-based command-and-control infrastructure. Some samples incorporate a large language model component, indicating experimentation with AI by threat actors.

AppWizard

February 19, 2026

PromptSpy Android Malware Abuses Google Gemini to Automate Recent-Apps Persistence

Cybersecurity researchers have identified a new Android malware named PromptSpy that utilizes Google's Gemini AI chatbot to enhance its capabilities and persistence on infected devices. PromptSpy can capture lockscreen data, obstruct uninstallation, gather device information, take screenshots, and record screen activity. It integrates Gemini to analyze the current screen and provide instructions to keep the malware active in the recent apps list. The malware uses a hard-coded AI model and communicates with a command-and-control server via the VNC protocol, allowing remote access to the victim's device. It is financially motivated, targeting users in Argentina, and was developed in a Chinese-speaking environment. PromptSpy is distributed through a dedicated website and is considered an advanced version of a previously unidentified malware called VNCSpy.