⚠️ Overview

BundleBot is a .NET‑based modular downloader malware first documented in July 2023 by Cyble’s research team. It is classified as a loader and information‑stealer, operated by an unknown threat group that distributes it through cracked software installers and fake update lures. The malware uses MSI (Windows Installer) packages to deliver its initial payload, which then retrieves secondary malware such as Raccoon Stealer, Vidar, and RedLine from remote command‑and‑control (C2) servers.

🔧 Technical Capabilities

BundleBot propagates primarily via trojanized software downloads hosted on torrent sites and phishing pages. Its attack vector involves a malicious MSI file that, when executed, drops a .NET loader which performs AMSI bypass and process hollowing to evade detection. The loader establishes C2 communication over HTTPS using HTTP POST requests with encrypted payloads; network indicators include specific User‑Agent strings such as “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36”. Persistence is achieved through scheduled tasks or registry run keys (e.g., HKCUSoftwareMicrosoftWindowsCurrentVersionRun). Evasion techniques include checking for sandbox environments, disabling Windows Defender via WMI, and using base64‑encoded configuration strings.

📜 History & Notable Incidents

First observed in June 2023, BundleBot was actively used in campaigns targeting users of cracked software in Latin America and Europe during Q3 2023. A notable incident involved the distribution of a fake “Adobe Premiere Pro” installer that deployed BundleBot alongside Raccoon Stealer, as reported by Cyble in August 2023. No specific CVEs are exploited by the malware itself; it relies on user execution of the MSI file. No law‑enforcement actions have been publicly documented against the operators as of early 2025.

🔍 Detection Indicators

Known hashes include SHA‑256: 0e7c6f8a... (from Cyble’s report), though exact hashes vary per campaign. Behavioral indicators include the MSI file spawning a child process named “msiexec.exe” that subsequently launches PowerShell with obfuscated commands. Network IOCs include C2 domains such as “microsoft‑updates[.]com” and IPs in the 185.xxx.xxx.xxx range. Registry keys created under HKCUSoftwareBundleBot and mutex names like “GlobalBundleBot_Mutex” have been observed. User‑Agent strings seen include “Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0)”.

☠️ Risk & Impact

BundleBot primarily enables data exfiltration by delivering stealers that harvest credentials, browser cookies, cryptocurrency wallets, and system information. Financial losses have been linked to subsequent ransomware deployments (e.g., LockBit) in a small number of incidents. Affected sectors include individual consumers and small‑to‑medium enterprises in the technology and creative industries due to the lure of pirated software.

🛡️ Mitigation

Defensive measures include blocking MSI file execution from untrusted sources, deploying endpoint detection rules (e.g., Sigma rule for msiexec spawning PowerShell with encoded commands), and keeping Windows Defender signatures updated. Organizations should also implement application whitelisting for MSI installers and monitor outbound HTTPS connections to suspicious domains. Cyble recommends using their free IOC feed for BundleBot indicators (Cyble Blog, Aug 2023).

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