CikaBika Bot uses fake documents to infect Windows systems, then abuses Discord and Ngrok to execute commands, spy on victims, and steal files. Darktrace researchers have documented a new campaign distributing a remote access trojan called CikaBika Bot, written in Rust and controlled entirely through Discord. The infection chain starts with a disk image that looks like a business proposal, and ends with an attacker who can run arbitrary commands, steal files, and capture your screen, all through messages in a chat platform. “The infection chain begins with a disk image and a malicious Windows shortcut. A Nim loader extracts the final payload and attempts to plant it in Microsoft Edge’s installation directory using a PowerShell UAC bypass.” reads the analysis published by Darktrace. “Once running, the RAT collects host information, registers the device with Discord, and accepts commands through a dedicated channel.” The attackers use a disk image named Proposition_Projet.img as a lure; it contains two files, a PDF that appears to be a legitimate French-language document about writing summaries, and a Windows shortcut disguised as a Word document. Open the shortcut and a hidden PowerShell process starts running in the background while the PDF displays on screen to keep the victim occupied. The shortcut starts PowerShell, which reads the fake PDF as raw data. It uses a value hidden inside the file as a key to decrypt and extract a program, then saves it to a temporary folder. This program is a loader written in Nim, a programming language that is less common in malware than C. Attackers may use Nim because security tools are less familiar with it. The loader contains two more components: a Rust DLL and a PowerShell script. The PowerShell script then tries to copy the DLL into Microsoft Edge’s installation folder and name it dbghelp.dll. This is the name of a legitimate debugging library that Edge normally loads. To access the protected folder without triggering a User Account Control (UAC) prompt, the script changes a Windows registry setting and misuses computerdefaults.exe to bypass the security check. Darktrace describes the technique as DLL search-order hijacking. “The attacker appears to be exploiting this dependency through DLL search-order hijacking. However, it does not export every function in Edge’s delay-import table, meaning its compatibility with the host is incomplete.” the analysis continues.”The observed code establishes the intended sideloading route, rather than proving that Edge successfully loaded the planted DLL.” However, the researchers note that the malicious DLL does not provide all the functions Edge expects, so this technique may not work on every system. Assuming the implant lands and runs, it immediately registers the infected machine with Discord, creating a dedicated channel for that specific device. It then collects system information, runs tasklist and ipconfig, takes a screenshot, and sends everything back to the operator through that channel. The attacker gets a full picture of the machine within the first few seconds of infection. The command set from there covers most of what an attacker would need. Remote shell access, process listing and termination, file upload and download, and surveillance functions including screenshot capture, camera access, and screen streaming. “Once installed, CikaBika Bot uses Discord as its C2 platform, allowing the attacker to manage compromised devices, execute commands, and retrieve files without maintaining dedicated C2 infrastructure.” the cybersecurity firm states. “The observed use of Discord channels for individual victims, alongside additional data exfiltration through ngrok, shows how legitimate services can be repurposed to support malicious operations.” Discord is a legitimate service used by millions of people and organizations every day. Traffic to Discord doesn’t look unusual on most networks, it’s not blocked by default, and standard endpoint security tools aren’t designed to treat Discord messages as potential command-and-control traffic. The attacker never has to spin up a dedicated server, register a suspicious domain, or deal with infrastructure that can get taken down. They just need a Discord account. One drawback for attackers is that Discord can detect abuse and shut down the accounts and servers they use. However, creating new accounts is easy and costs very little. The attackers also use Ngrok to transfer files instead of sending large amounts of data through Discord. This reduces their reliance on Discord and limits the impact if the platform shuts down their accounts. “CikaBika Bot demonstrates how attackers continue to rely on social engineering techniques to deliver malware.” concludes the report. “Although the initial distribution method has not been confirmed, the use of a disk image containing a shortcut disguised as a Word document, alongside a legitimate-looking PDF, suggests the campaign was designed for phishing.” Follow me on Twitter: @securityaffairs and Facebook and Mastodon Pierluigi Paganini (SecurityAffairs – hacking, malware)
Security Affairs Malware newsletter includes a collection of the best articles and research on malware in the international landscape Malware Newsletter IronChain Ransomware Threatens Businesses with Permanent Data Loss and Costly Downtime AI models may be capable of self-replicating without access to a datacenter XWorm Reborn: From infostealer to surveillance platform Hirudo: From Fake Updates to Patched Banking Apps The campaign that never stopped: tracking GhostAction from 2025 to 2026 Exposing AdFection How Discover-Tech Turned Targeted Ads Into a Pipeline for Zero-Click Mercenary Spyware BREAK THE SILENCE: TRACKING SILENT LYNX THROUGH EXPOSED INFRASTRUCTURE Unit 42 Uncovers PEERSTITCH, a Stealthy FortiGate Implant An Italian Phishing Campaign Delivering an iOS Exploit Chain Malfex imgdecode npm native addon loader CikaBika Bot: Inside a Discord RAT Trigger Value Selection in Clean-Label Malware Backdoors: An Effectiveness-Detectability Analysis Phantomware: a Data Augmentation Framework for the Detection of Emerging Malware Campaigns XGCN-GAT: An Explainable and Robustness-Aware Hybrid Graph Neural Network Framework for Android Malware Detection Geometry-Aware Risk-Guided Active Learning for Malware Concept Drift Adaptation Follow me on Twitter: @securityaffairs and Facebook and Mastodon Pierluigi Paganini (SecurityAffairs – hacking, newsletter)
A new round of the weekly Security Affairs newsletter has arrived! Every week, the best security articles from Security Affairs are free in your email box. Enjoy a new round of the weekly SecurityAffairs newsletter, including international press. North Korean IT Workers Used Stolen US Identities to Earn $3 MillionU.S. CISA adds Fortinet Multiple Products and BeyondTrust Remote Support flaws to its Known Exploited Vulnerabilities catalogBAE Systems Cyber Incident Takes US Bankruptcy Noticing Center Offline for a WeekAI Agents Accessed Indian Organizations Without Authorization, CERT-In WarnsBurger King Japan Data Breach Impacted 11 Million CustomersF5 addressed critical RCE flaws in NGINXU.S. CISA adds Atlassian flaw to its Known Exploited Vulnerabilities catalogPEERSTITCH malware: How Attackers Compromised 500 Firewalls Through FortiManagerCenterPoint Energy Data Breach: More Than 1 Million Texans AffectedU.S. CISA adds Palo Alto Networks PAN-OS, Ahsay AhsayCBS, and Cisco Secure Email Gateway flaws to its Known Exploited Vulnerabilities catalogSilent Lynx: Kazakhstan-Linked Hackers Target Russian Refinery and GovernmentAdFection: Beyond the Click: Citizen Lab Exposes Ad-Delivered Spyware NetworksCisco Urges Customers to Patch Email Gateway Flaw and Check for CompromiseHirudo Android Trojan Replaces Banking Apps to Steal CredentialsU.S. CISA adds Microsoft Windows Shell flaw to its Known Exploited Vulnerabilities catalogMicrosoft Patch Tuesday Sets New Record with 1,415 CVEs in October 2026 UpdatesHidden Audio Recorder Found at OpenAI as Employee Faces Federal ChargesVolexity Uncovers Stealthy Ivanti VPN Attack Using Three Zero-Day VulnerabilitiesHow a leaked builder of XWorm turned a remote access trojan into a surveillance kitU.S. CISA adds Ivanti Connect Secure flaw to its Known Exploited Vulnerabilities catalogAnthropic Shows How Small AI Models Could Replicate Across IoT DevicesGitLab Patches Max-Severity Vulnerability CVE-2026-97229Hackers cranked French supermarkets’ freezers up to 50 degrees, causing hundreds of stores to lose their stockShinyHunters arrest number three: a Canadian ransomware negotiatorCanonical Hit by Second DDoS Attack in 2026, Public Websites DisruptedSonicWall Patches CVSS 10.0 SSRF Flaw as Attacks BeginCyberXero Used 51 AI Agents to Steal 628,000 Ukrainian RecordsGTA 6 Leaker Demands $30M Meme Coin Market Cap to Release Full GameBitdefender finds preinstalled Android malware you can’t uninstall, seen in 150 countriesU.S. CISA adds ProFTPD, ONLYOFFICE Docs, Strapi, Apache Struts, and ISC BIND flaws to its Known Exploited Vulnerabilities catalog International Press – Newsletter Cybercrime Leaked chats show Russian extortion gang sending ‘agents’ into US law firms GTA 6 leaker CyberLeek is now reportedly threatening to release a full, playable build of the game CyberXero: An AI-Augmented Initial Access Broker Targeting Ukrainian Critical Infrastructure ShinyHunters: Six Years of Cybercrime — Expert Analysis and Ransomware Group Perspectives Canonical Websites Disrupted in Second DDoS Attack This Year Canadian ransomware negotiator arrested amid FBI hacker crackdown Saudi National Arrested for Installing Surreptitious Audio Recording Device at OpenAI Ransomware gets personal: ‘We-know-where-you-are kind of stuff’ Malware IronChain Ransomware Threatens Businesses with Permanent Data Loss and Costly Downtime XWorm Reborn: From infostealer to surveillance platform Hirudo: From Fake Updates to Patched Banking Apps The campaign that never stopped: tracking GhostAction from 2025 to 2026 Malfex imgdecode npm native addon loader Hacking Hackers heat French supermarket fridges, sparking fires and spoiling food Freeze the Controller, Defrost the Food: Uncovering Vulnerabilities in Danfoss Refrigeration Controllers Critical SonicWall SMA 1000 Flaw Targeted in 135 Exploitation Attempts After Patch Super Intelligence Reached OT Systems and Moved Equipment AI models may be capable of self-replicating without access to a datacenter A Series of Unauthenticated Events: Chained Exploitation of Ivanti Connect Secure Zero-Days Vghost: Beyond the Privilege Boundary Bank of America had to bring in 1,000 contractors to patch all the bugs Mythos identified Using a funded test cryptocurrency wallet without authorization Intelligence and Information Warfare Disrupting AI-enabled “false front” operations Britain steps up national defences against growing AI risks Russia’s Yandex bot traffic nearly eliminated overnight after Ukraine drone strikes cripple multiple of ‘Russia’s Google’ data centers — Ukraine intensifies bombing of Yandex data centers in response to Moscow’s strikes on Kyiv data centers UK keeps AI safeguards in the maybe pile for Cyber Security BIll UAE faces over 800,000 cyberattacks daily: How the country is fighting back Exposing AdFection How Discover-Tech Turned Targeted Ads Into a Pipeline for Zero-Click Mercenary Spyware BREAK THE SILENCE: TRACKING SILENT LYNX THROUGH EXPOSED INFRASTRUCTURE Flock CEO defends surveillance technology amid national backlash: ‘We shouldn’t pause progress’ ARMORY CASTLE and BT26-05: What Security Teams Need to Know Justice Department Announces Coordinated Actions to Combat North Korean Remote IT Worker Schemes Affecting More than 70 U.S. Companies U.S. Government Disrupts FAMOUS CHOLLIMA Operation with CrowdStrike Assistance Cybersecurity ‘123456’ password linked to Denmark data breach affecting 8.8M people AI Governance Is Being Decided Now, and the Public Isn’t in the Room The October 2026 Security Update Review Bank of America had to bring in 1,000 contractors to patch all the bugs Mythos identified Cisco Warns of Active Attacks Exploiting New Critical Secure Email Gateway Vulnerability Millions of phones exposed to Israeli spyware operation through online ads, researchers say More than 1 million Texans affected by CenterPoint data breach, AG report shows US federal bankruptcy court operations disrupted by cybersecurity incident Follow me on Twitter: @securityaffairs and Facebook and Mastodon Pierluigi Paganini (SecurityAffairs – hacking, newsletter)
Drupal has patched two critical vulnerabilities that could allow attackers to execute code remotely on websites running any supported version of the content management system. The security issues impact the software core's Field UI module and the contributed Entity List module. Drupal issued an advance warning at the beginning of the week, urging administrators to apply updates promptly because attackers could develop exploits shortly after the vulnerabilities’ disclosure. “The Drupal Security Team urges you to reserve time for core updates at that time because exploits might be developed within hours or days,” the project's security team warned. “We recommend updating to the latest supported patch (bugfix) release for your site's version of Drupal before October 14, so that you can address any other upgrade issues before the security window.”
Cybersecurity researchers have discovered a malicious npm package that's part of a recently disclosed software supply chain attack campaign dubbed MALFEX. The package, named "imgdecode," was uploaded to the package registry on September 30, 2026, by a user named "malfexteste8." It has been downloaded 979 times as of writing and is still available on npm as of writing. The latest version of
Researchers warn that hackers could soon exploit a maximum-severity vulnerability (CVE-2026-103849) affecting Magento and Adobe Commerce, potentially allowing them to execute arbitrary PHP code on store servers. According to e-commerce security firm Sansec, attacks leveraging the vulnerability, dubbed BlockStrap, have not yet been observed, but threat actors are expected to find a way to exploit it. The researchers based their assessment on identifying four potential attack paths involving CVE-2026-103849 in less than 24 hours. The flaw impacts September versions of Adobe Commerce and Magento Open Source through 2.4.9 and Adobe Commerce B2B through 1.5.3. The security firm warned that Adobe’s “priority 2” rating of this flaw does not reflect the danger and urgency in this case, despite the more complex attack path.
Candiru spyware was delivered to devices at Al Jazeera Media Network via targeted online advertisements in a zero-click attack that required only rendering the malicious ads on the victim's device. Researchers at Citizen Labs investigating the attacks referred to this technique as AdFection, noting that their report is the first public technical confirmation of mercenary spyware delivered through targeted ads. A similar method was documented in late 2025 by Amnesty International, involving ads that infected targets with Predator spyware without them clicking anything. That infection mechanism was called Aladdin and surfaced due to a collection of marketing files and documents leaked from the Intellexa surveillance company that researchers studied and corroborated with technical details from forensic investigations.
Employees using personal ChatGPT accounts at work can expose sensitive company data, even when their organization provides an approved Enterprise workspace. NordLayer explains how IT teams can investigate unauthorized AI use and block sensitive information before it reaches personal accounts.
F5 addressed multiple vulnerabilities, including critical RCE flaws in NGINX that attackers could exploit without authentication. Security and application delivery firm F5 announced fixes for eleven security issues in NGINX. Among them, critical vulnerabilities tracked as CVE-2026-15176 and CVE-2026-93479 could be exploited without authentication via crafted HTTP requests. Under certain conditions beyond their control, an unauthenticated attacker could exploit the security flaws to trigger a buffer overflow leading to a restart. If ASLR is disabled or can be bypassed, the attacker could achieve RCE. The flaw CVE-2026-15176 (CVSS score of 9.2) is a heap-based buffer overflow vulnerability in NGINX Plus and NGINX Open Source that could allow an unauthenticated attacker to trigger a denial-of-service condition or potentially execute arbitrary code by sending crafted HTTP requests. The vulnerability occurs under specific configurations involving the alias directive and the $request_filename variable. Remote code execution may be possible if ASLR is disabled or bypassed. The flaw CVE-2026-93479 (CVSS score of 9.2) is a heap-based buffer overflow vulnerability in NGINX Plus and NGINX Open Source that could allow an unauthenticated attacker to trigger a denial-of-service condition or potentially execute arbitrary code through crafted HTTP requests. It affects specific configurations where regular-expression capture variables from the map directive are referenced before the map output variable, or where a non-cacheable variable is used in a string expression under certain conditions. Remote code execution may be possible if ASLR is disabled or bypassed. The third critical flaw fixed by the vendor, tracked as CVE-2026-97205 (CVSS score of 9.2), is a use-after-free vulnerability in NGINX ngx_http_core_module that, under certain configurations with asynchronous file I/O (AIO) enabled, may cause memory corruption or unexpected worker process termination when processing Server Side Includes (SSI) pages containing include virtual commands. A remote attacker could exploit the flaw to cause a denial-of-service (DoS) or potentially execute code, particularly when ASLR is disabled or can be bypassed. Follow me on Twitter: @securityaffairs and Facebook and Mastodon Pierluigi Paganini (SecurityAffairs – hacking, NGINX)
U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Atlassian flaw to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added an Atlassian flaw, tracked as CVE-2026-21589 (CVSS score of 9.3), to its Known Exploited Vulnerabilities (KEV) catalog. In early October, threat actors started exploiting CVE-2026-21589, a critical arbitrary file access flaw in Atlassian Data Center products. The vulnerability could allow attackers to access sensitive files under certain conditions. Affected products include Bitbucket, Confluence, Jira Service Management, Jira Software, Bamboo, Crowd, Crucible, and Fisheye. “This Arbitrary File Access vulnerability allows an unauthenticated attacker to access specific files within the web application root directory in affected versions. Exploitation requires prior knowledge of the target file’s exact name and path; this vulnerability does not allow attackers to enumerate or list directory contents.” reads the advisory. “In some configurations, there may be some sensitive files that make this highly severe.” Previdian telemetry has detected 15 exploitation attempts from three IP addresses in Japan and the U.S.. “Exploitation has now started to hit our honeypot network” Previdian Founder Ryan Dewhurst wrote on LinkedIn. On October 6, watchTowr Labs published a technical analysis of CVE-2026-21589 after comparing vulnerable and patched Atlassian packages. Researchers found a path traversal flaw where double-colon (::) sequences can be treated as path separators, allowing attackers to read files from the application web root. “While semicolons (;) are very common in path traversal within Java applications, along with the everyday dots (.) and slashes (/), one item stood out: the matching of double colons (::).” reads the analysis. “This is uncommon syntax for this type of vulnerability, but grepping through the codebase we came across an all too familiar sight.” In one Crowd deployment with Jira, researchers were able to read crowd.properties, which exposed application credentials. They then used those credentials to create a user and add it to the jira-administrators group. Crowd IP allowlisting can block this attack path. Exploitation attempts against its honeypot network reportedly began two hours after watchTowr published additional technical details about the vulnerability. According to watchTowr, the problem is in Atlassian’s web-resource handling. It can turn a string such as ..::..::..::..::WEB-INF::web.xml into ../../../../WEB-INF/web.xml, allowing attackers to move through directories and access files they should not be able to read. Atlassian says all versions before the listed fixed versions are affected: ProductFixed versionsBitbucket Data Center9.4.26, 10.2.8, 10.5.1Confluence Data Center9.2.26, 10.2.19Jira Service Management Data Center5.12.40, 10.3.26, 11.3.12Jira Software Data Center9.12.40, 10.3.26, 11.3.12Bamboo Data Center10.2.24, 12.1.12Crowd Data Center6.3.7, 7.0.3, 7.1.7, 7.2.4Crucible4.9.15Fisheye4.9.15 watchTowr has released a free tool on GitHub to help check if a server is vulnerable. According to Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities, FCEB agencies have to address the identified vulnerabilities by the due date to protect their networks against attacks exploiting the flaws in the catalog. Experts also recommend that private organizations review the Catalog and address the vulnerabilities in their infrastructure. CISA orders federal agencies to fix the flaw by October 18, 2026. Follow me on Twitter: @securityaffairs and Facebook and Mastodon Pierluigi Paganini (SecurityAffairs – hacking, CISA)
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