Month: September 2025

Security Advisory

Fake Govt & Banking Apps Spreading Android Droppers Evolved as Malware

Security Advisory:  

Cybersecurity researchers have discovered a major shift in how Android malware is being delivered. Dropper apps, which were earlier used mainly to distribute banking trojans.

The Malware’s being used to deliver simpler threats like SMS stealers and basic spyware as official government or banking apps, primarily targeting users in India, Southeast Asia, and some parts of Europe. 

ThreatFabric researchers warn of a shift in Android malware: dropper apps now deliver not just banking trojans, but also SMS stealers and spyware, mainly in Asia.

Vulnerability Details 

The recent surge in Android dropper apps introduces a critical security vulnerability affecting mobile users globally. These droppers are impersonating as banking apps, government services, or trading platforms,, bypass Google Play

Pilot Program by initially requesting minimal permissions to avoid detection, making them appear as legitimate applications.

Once installed, they fetch malicious payloads like spyware, SMS stealers, cryptocurrency miners, and banking trojans from remote servers. Attackers also exploit malvertising campaigns on social media to spread fake apps widely. This evolving tactic enables cybercriminals to switch payloads dynamically, making traditional security measures less effective and increasing the risk of data theft and device compromise. 

Source: cybersecuritynews 

Attack Flow 

Step Description 
1. Craft Attackers create malicious dropper apps disguised as government schemes, banking apps, or trading tools. These apps are designed to look harmless and request only minimal permissions initially. 
2. Send The droppers are distributed through third-party APK sites, malicious ads (e.g., Facebook), or fake update prompts, bypassing initial detection. 
3. Trigger The victim downloads and installs the dropper app, often believing it’s legitimate due to its official-looking design and branding. 
4. Execution When the user clicks “Update” or interacts with the app, the dropper fetches the real malicious payload (spyware, SMS stealer, or banking trojan) from a remote server. 
5. Exploit The installed malware requests high-risk permissions, such as SMS access or notification access, allowing attackers to steal data, track activities, or control the device remotely. 

Proof-of-Concept 

Once the user interacts, the dropper initiates an HTTPS request to a remote server 

Source: cybersecurity news 

Why It’s Effective 

Dynamic Payload Delivery – Attackers hide the real malicious file inside a harmless-looking dropper app. The payload is only downloaded after user interaction, making it harder to detect. 

Permission Evasion – Droppers initially request minimal or safe permissions and only ask for high-risk permissions (like SMS or accessibility access) after installation, bypassing Google Play Protest’sProtects initial scans. 

Fake Update Screens – Many droppers display legitimate looking “Update Required” prompts to trick users into downloading malware, increasing their success rate. 

Recommendations: 

Download Apps Safely  

  • Install apps only from trusted sources like Google Play Store, Apple store etc. 
  • Avoid third-party APKs, unknown links, or apps promoted through social media ads. 

Check Permissions Carefully  

  • Do not grant unnecessary permissions like SMS, notifications, or accessibility dependent on the app services. 
  • Always review requested permissions before installing or updating an app. 

Keep Devices Secure  

  • Enable Google Play Protect and keep your Android security patches up to date. 
  • Use a reliable mobile security solution for real-time malware detection. 

Stay Alert and Aware  

  • Be aware of fake update prompts; apps, and malicious sites. 
  • Stay updated on the latest tactics used by Android malware 

Conclusion: 

  • Android droppers are evolving fast, making them more flexible and harder to detect, increasing risks for both individuals and organizations.
  • Droppers started as tools for advanced banking malware, but now they’re used to install all kinds of harmful apps and sneak past local security.  
  • It is always recommended to stay vigilant, keep your phone and software updated from the original source  and avoid unverified apps installation to minimize the risk of infection. 

References: 

Blogs

Azure AD configuration file for ASP.NET Core apps credentials leaked by Cybercriminals

A critical flaw in AzureD supported cyber criminals to get access to the digital keys in Azure cloud environment and discovered by Resecurity researchers .

The action enabled unauthorized token requests against Microsoft’s OAuth 2.0 endpoints and giving adversaries a direct path to Microsoft Graph and Microsoft 365 data.

A small critical cloud misconfiguration can give access to cyber attackers to infiltrate and this happened to Azure D when their Cloud native application configuration file for ASP.NET Core applications has been leaking credentials for Azure ActiveDirectory (AD).

Cloud application are not merely hosted in the cloud instead they are built to thrive in a cloud environment, providing unprecedented scalability, resilience and flexibility making them game changer.

Recently the publicly accessible configuration file for ASP.NET Core applications has been leaking credentials for Azure ActiveDirectory (AD). This potentially led attackers to authenticate directly via Microsoft’s OAuth 2.0 endpoints and infiltrate Azure cloud environments.

This issue cannot be overlooked by enterprise as the discovery by Resecurity’s HUNTER team exposed Azure AD credentials  ClientId and ClientSecret — exposed in an Application Settings (appsettings.json) file on the public Internet.

Once the credentials lands up in hackers domain any malicious activates can be conducted and compromise an organization’s Azure-based cloud deployment simultaneously retrieve sensitive data from SharePoint or Exchange Online etc. Further abuse of Graph API for privilege escalation or persistence; and the deployment of malicious applications under the organization’s tenant.

Exploiting AzureD Flaw The attack flow

To exploit the flaw, an attacker can first use the leaked ClientId and ClientSecret to authenticate against Azure AD using the Client Credentials from OAuth2 flow to acquire an access token.

Once this is acquired, the attacker then can send a GET request to the Microsoft Graph API to enumerate users within the tenant.

This allows them to collect usernames and emails; build a list for password spraying or phishing; and/or identify naming conventions and internal accounts, according to the post.

Cyber attacker also can query the Microsoft Graph API to copy OAuth2 to take permission grants within the tenant, revealing which applications have been authorized for further permissions, they hold.

Once acquired token allows an attacker to use group information to identify privilege clusters and business-critical teams.

Protecting Enterprise from getting Azure secrets exposed.

Enterprise failing to practice regular scanning, penetration tests, or code reviews, exposed cloud files can remain unnoticed until attackers discover them and exploit them, according to the post.

Further for better security posture enterprise can restricting file access; removing secrets from code and configuration files; rotating exposed credentials immediately; enforcing least privilege principles and setting up monitoring and alerts on credential use, according to the post.

Importance of automation in cloud native application

Implement continuous integration and continuous deployment (CI/CD) pipelines to automate building, deploying, and testing cloud native applications. Manage and provision cloud infrastructure using code, allowing for version control and repeatability. 

Several benefits of following best practices when developing cloud native apps, like increased scalability, fewer occurrences of critical failures, and high efficiency

Enterprises having product based focus will go for cloud-first approach and ask questions on how to go about cloud computing etc.

What could have happened or will happen if not looked into Azure Active Directory (Azure AD) flaw?

Azure Active Directory (Azure AD) termed as high impact in terms of vulnerability.

Once authenticated, attackers can:

  • Retrieve sensitive SharePoint, OneDrive, or Exchange Online data via Graph API calls.
  • Enumerate users, groups, and roles, mapping out the tenant’s privilege model.
  • Abuse permission grants to escalate privileges or install malicious service principals.
  • Deploy rogue applications under the compromised tenant, creating persistence and backdoors.

Enterprises must perform compliance checks to ensure that application designed meets industry standards and regulatory requirements. Once robust auditing and reporting mechanisms is on track that changes any access to sensitive data. 

Source: JSON Config File Leaks Azure AD Credentials

Critical Flaw in Azure AD Lets Attackers Steal Credentials and Install Malicious Apps

Security Advisory

MediaTek Patches Critical Modem Vulnerabilities  

Security Advisory: MediaTek disclosed critical vulnerabilities along with remediation for its modem and system components. Since the vulnerabilities affected thousands of devices, amounting to both multiple high- and medium vulnerabilities that affected, 60 chipsets used in smartphones, routers and IoT devices.

OEM MediaTek 
Severity High 
CVSS Score 8.3 (NOA) 
CVEs CVE-2025-20708, CVE-2025-20703, CVE-2025-20704, CVE-2025-20705, CVE-2025-20706, CVE-2025-20707 
POC Available No 
Actively Exploited No 
Exploited in Wild No 
Advisory Version 1.0 

Overview 

MediaTek issued a critical security update in September 2025 and key issues include modem-related flaws such as remote code execution, denial of service via rogue base stations and local privilege escalation.

Other vulnerabilities include WLAN buffer overflows, bootloader logic flaws and keymaster information leaks impacting Android devices and OpenWRT/Yocto platforms. There has been no active exploitation noticed and MediaTek began distributing patches to OEMs from July 2025 and urges immediate firmware updates to mitigate the issues. 

                Vulnerability Name CVE ID Product Affected Severity 
​Out-of-bounds write in Modem  CVE-2025-20708 Affected chipsets – 60 chipsets 
Modem NR15,16,17,17R software versions. 		 High 
Out-of-bounds read in Modem CVE-2025-20703 Affected chipsets – 57 chipsets 
Modem NR15,16,17,17R software versions. 		High 
Out-of-bounds write in Modem CVE-2025-20704 Affected chipsets – 14 chipsets 
Modem NR17,17R software versions. 		High 
Use after free in monitor_hang CVE-2025-20705 Affected chipsets – 39 chipsets 
Android 13 – 16,   openWRT 19.07, 21.02 / Yocto 2.6 software versions. 		Medium 
Use after free in mbrain CVE-2025-20706 Affected chipsets – 5 chipsets 
Android 14 – 15 software versions. 		Medium 
Use after free in geniezone CVE-2025-20707 Affected chipsets – 60 chipsets 
Android 13 – 15 software versions. 		Medium 

Technical Summary 

These vulnerabilities primarily include out-of-bounds read and write errors (CWE-125, CWE-787) and use-after-free issues (CWE-416), resulting from improper bounds checking and memory management flaws. 

An attacker controlling a rogue base station can exploit these flaws remotely without requiring user interaction, potentially causing remote denial of service, unauthorized privilege escalation, or local privilege escalation if system privileges are already obtained. The exploitation of these vulnerabilities could compromise device stability, security and confidentiality by corrupting memory or executing arbitrary code. Affected devices use modem firmware versions NR15 through NR17R, and a wide spectrum of chipsets, highlighting the broad attack surface. 

CVE ID Vulnerability Details Impact 
CVE-2025-20708 An out-of-bounds write flaw exists in the Modem due to incorrect bounds checking. This vulnerability allows remote escalation of privilege when a UE connects to a rogue base station, without requiring additional execution privileges or user interaction. Unauthorized access, data interception, disruption of cellular services 
CVE-2025-20703 The Modem is affected by an out-of-bounds read issue caused by improper bounds validation. This can result in remote denial of service if connected to a malicious base station, and exploitation requires no user interaction or extra privileges. Denial of Service (DoS), modem or device crash, freeze, unresponsiveness 
CVE-2025-20704 Due to a missing bounds check, the Modem is vulnerable to an out-of-bounds write. Exploiting this flaw can lead to remote escalation of privilege when connected to a rogue base station, though user interaction is necessary. Remote privilege escalation, unauthorized elevated access 
CVE-2025-20705 A use-after-free condition in the monitor_hang module can cause memory corruption, potentially leading to local escalation of privilege if the attacker already has System-level access. Exploitation does not require user interaction. Local privilege escalation, memory corruption 
CVE-2025-20706 The mbrain component suffers from a use-after-free vulnerability that can result in memory corruption. This may allow local privilege escalation for an attacker with System privileges, without needing user interaction. Local privilege escalation, memory corruption 
CVE-2025-20707 In the geniezone module, a use-after-free vulnerability can cause memory corruption and permit local privilege escalation if the attacker has System privileges, with no user interaction needed. Local privilege escalation, memory corruption 

Recommendations: 

Here are some recommendations below 

  • Once OEM updates are available, make sure to update your device promptly to apply the latest security patches addressing these vulnerabilities. 
  • Avoid connecting to unknown networks to reduce the risk of remote exploitation. 
  • Keep your device’s operating system and apps updated to the latest version. 

Conclusion: 
MediaTek’s recent security update addresses critical vulnerabilities, especially in modem firmware, that could allow remote attacks without user interaction. Although no active exploits have been found, the severity and scope of these flaws make it vital for manufacturers and users to promptly apply patches to protect devices and data. 

The company reassures end users that proactive notification and remediation precede public disclosure, underscoring MediaTek’s commitment to chipset and product security.

References: 

Security Advisory

Threat Actors Exploiting Microsoft Teams to Gain Remote Access & Transfer Malware 

Security Advisory:

A new wave of social engineering attacks is exploiting Microsoft Teams, one of the most trusted enterprise collaboration platforms as a malware delivery channel.

Threat actors are impersonating IT support staff to trick employees into installing remote access tools and running malicious PowerShell scripts, enabling full compromise of victim environments. 

This campaign represents an evolution beyond traditional phishing, weaponizing corporate communication channels that employees inherently trust. Once access is established, attackers deploy multifunctional malware loaders such as DarkGate and Matanbuchus, with capabilities for credential theft, persistence, lateral movement and ransomware deployment. 

Technical Summary 

Security researchers have observed financially motivated threat groups abusing Microsoft Teams chats and calls to impersonate IT administrators. Attackers create malicious or compromised Teams accounts often using convincing display names like “IT SUPPORT ” or “Help Desk Specialist” as looking like legitimate and verified account to initiate direct conversations with employees. The social engineering process typically follows this chain 

Attack Process                                                                             Source: permiso.io 

It included the malware features 

  • Credential theft via GUI-based Windows prompts. 
  • Persistence using Scheduled Tasks (e.g. Google LLC Updater) or Registry Run keys. 
  • Encrypted C2 communications with hardcoded AES keys & IVs. 
  • Process protection via RtlSetProcessIsCritical, making malware harder to remove. 
  • Harvesting system info for reconnaissance and follow-on payloads. 

The campaigns have been linked to threat actor groups such as Water Gamayun (aka EncryptHub), known for blending social engineering, custom malware and ransomware operations. 

Element Detail 
Initial Access Direct messages/calls via Microsoft Teams impersonating IT staff 
Social Engineering Fake IT accounts with display names like “IT SUPPORT ✅” and onmicrosoft.com domains 
Malicious Tools QuickAssist, AnyDesk, PowerShell-based loaders (DarkGate, Matanbuchus) 
Persistence Scheduled Tasks (Google LLC Updater), Registry autoruns 
Payload Features Credential theft, system profiling, encrypted C2, remote execution 
Target Enterprise employees, IT professionals, developers 
Objective Credential theft, long-term access, ransomware deployment 

IOCs 

Organizations are urged to block the following indicators immediately: 

Indicator Type 
https://audiorealteak[.]com/payload/build.ps1 URL 
https://cjhsbam[.]com/payload/runner.ps1 URL 
104.21.40[.]219 IPv4 
193.5.65[.]199 IPv4 
Mozilla/5.0 (Windows NT; Windows NT 10.0; en-US) AppleWebKit/534.6 (KHTML, like Gecko) Chrome/7.0.500.0 Safari/534.6 UA 
&9*zS7LY%ZN1thfI Initialization Vector 
123456789012345678901234r0hollah Encryption Key 
62088a7b-ae9f-2333-77a-6e9c921cb48e Mutex 
Help Desk Specialist  User Display Name 
IT SUPPORT User Display Name 
Marco DaSilva IT Support  User Display Name 
IT SUPPORT  User Display Name 
Help Desk User Display Name 
@cybersecurityadm.onmicrosoft.com User Principal Name 
@updateteamis.onmicrosoft.com User Principal Name 
@supportbotit.onmicrosoft.com User Principal Name 
@replysupport.onmicrosoft.com User Principal Name 
@administratoritdep.onmicrosoft.com User Principal Name 
@luxadmln.onmicrosoft.com User Principal Name 
@firewalloverview.onmicrosoft.com User Principal Name 

Remediation: 

  1. Strengthen Microsoft Teams Security 
  • Restrict external tenants and enforce strict access control on Teams. 
  • Implement anomaly detection for suspicious Teams account activity. 
  • Block installation of unauthorized remote access tools (QuickAssist, AnyDesk). 

2. Enhance Endpoint & Network Defenses 

  • Monitor PowerShell execution with EDR/XDR solutions. 
  • Detect persistence artifacts (scheduled tasks, autorun keys, rundll32 activity). 
  • Block known IoCs at DNS/firewall levels. 

 3. Employee Awareness & MFA Security 

  • Train employees to verify IT support requests through independent channels. 
  • Warn staff against installing software via unsolicited Teams messages. 
  • Enforce multi-factor authentication (MFA) for all accounts. 

Conclusion: 
By shifting malware delivery into Microsoft Teams, attackers are exploiting a platform that enterprises inherently trust. The blending of social engineering with technical abuse of PowerShell and remote access tools makes this campaign particularly dangerous, enabling attackers to infiltrate organizations without relying on traditional email phishing. 

Organizations must treat collaboration platforms as high-value attack surfaces not just communication tools. Strengthening monitoring, restricting external interactions and training employees to validate IT requests are critical to defending against this evolving threat.  

References: 

Blogs

Deep Dive into AI Ransomware ‘PromptLock’ Malware

AI Ransomware ‘PromptLock’ uses OpenAI gpt-oss-20b Model for Encryption has been identified by ESET research team, is believed to be the first-ever ransomware strain that leverages a local AI model to generate its malicious components. As we Deep dive into AI Ransomware we discover the intricacies and challenges organizations face dure to AI ransomware.

The malware uses OpenAI’s gpt-oss:20b model via the Ollama API to create custom, cross-platform Lua scripts for its attack.

PromptLock is written in Golang and has been identified in both Windows and Linux variants on the VirusTotal repository and uses the gpt-oss:20b model from OpenAI locally via the Ollama API to generate malicious Lua scripts in real-time.

ESET researchers have discovered the first known AI-powered ransomware. The malware, which ESET has named PromptLock, has the ability to exfiltrate, encrypt and possibly even destroy data, though this last functionality appears not to have been implemented in the malware yet.

PromptLock was not spotted in actual attacks and is instead thought to be a proof-of-concept (PoC) or a work in progress, ESET’s discovery shows how malicious use of publicly-available AI tools could supercharge ransomware and other pervasive cyberthreats.

“The PromptLock malware uses the gpt-oss-20b model from OpenAI locally via the Ollama API to generate malicious Lua scripts on the fly, which it then executes. PromptLock leverages Lua scripts generated from hard-coded prompts to enumerate the local filesystem, inspect target files, exfiltrate selected data, and perform encryption,” said ESET researchers.

New Era of AI Generated Ransomware

A tool can be used to automate various stages of ransomware attacks and the same can be said as AI-powered malware are able to adapt to the environment and change its tactics on the fly and warns of a new frontier in cyberattacks.

Its core functionality is different then traditional ransomware, which typically contains pre-compiled malicious logic. Instead, PromptLock carries hard-coded prompts that it feeds to a locally running gpt-oss:20b model.

As per researchers for its encryption payload, PromptLock utilizes the SPECK 128-bit block cipher, a lightweight algorithm suitable for this flexible attack model.

ESET researchers emphasize that multiple indicators suggest PromptLock is still in a developmental stage. For instance, a function intended for data destruction appears to be defined but not yet implemented.

Indicators of Compromise (IoCs)

Malware Family: Filecoder.PromptLock.A

SHA1 Hashes:

  • 24BF7B72F54AA5B93C6681B4F69E579A47D7C102
  • AD223FE2BB4563446AEE5227357BBFDC8ADA3797
  • BB8FB75285BCD151132A3287F2786D4D91DA58B8
  • F3F4C40C344695388E10CBF29DDB18EF3B61F7EF
  • 639DBC9B365096D6347142FCAE64725BD9F73270
  • 161CDCDB46FB8A348AEC609A86FF5823752065D2

Given LLMs’ success, many companies and academic groups are currently creating all kinds of models and constantly developing variants and improvements to LLM. In the context of LLMs, a “prompt” is an input text given to the model to generate a response. 

The success rate is high so threat actors are leveraging these models for illicit purposes, making it easier to create sophisticated attacks like ransomware and evade traditional defenses. sale of models Now

By automating the creation of phishing emails, ransomware scripts, and malware payloads, LLMs allow less skilled attackers to conduct sophisticated campaigns.

For AI-powered ransomware

AI-powered ransomware is a challenging threat to organizations far and above older attack tactics adopted by cyber criminals. If organization’s basic defensive methods such as ensuring critical vulnerabilities are patched as soon as possible, network traffic is monitored and implementing offline backups applied on time.

How Intrucept helps Defend Against AI-Powered Ransomware

Analyzing threat by behavior allows for early detection and response to malware threats and alert generation,. This reduces the risk of data exfiltration.

Intru360

Intru360 gives security analysts and SOC managers a clear view across the organization, helping them fully understand the extent and context of an attack. It also simplifies workflows by automatically handling alerts, allowing for faster detection of both known and unknown threats.

Identify latest threats without having to purchase, implement, and oversee several solutions or find, hire, and manage a team security analyst.

Unify latest threat intelligence and security technologies to prioritize the threats that pose the greatest risk to your company.

Here are some features we offer:

  • Over 400 third-party and cloud integrations.
  • More than 1,100 preconfigured correlation rules.
  • Ready-to-use threat analytics, threat intelligence service feeds, and prioritization based on risk.
  • Prebuilt playbooks and automated response capabilities.

Source of above graphics : Courtesy: First AI Ransomware ‘PromptLock’ Uses OpenAI gpt-oss-20b Model for Encryption

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