⚠️ Overview

Allaple is a polymorphic worm first identified in 2006 by Kaspersky Lab, classified as a network-aware worm that spreads via multiple vectors including removable drives, network shares, and weak administrator passwords. It belongs to the worm and botnet category, with no single attributed operator but widespread use by criminal groups for DDoS and credential harvesting; MITRE ATT&CK identifies it under S0042 (Allaple).

🔧 Technical Capabilities

Allaple uses polymorphic code generation to change its binary signature on each infection, evading signature-based antivirus detection (MITRE T1027.002). It propagates by scanning local networks for open SMB ports (TCP 445) and attempts to authenticate using a hardcoded list of weak passwords, then copies itself to writable network shares (MITRE T1021.002). It also spreads via removable drives by creating autorun.inf files (MITRE T1091). Once installed, it installs a backdoor that connects to hardcoded C2 servers over IRC or HTTP to receive commands for launching DDoS attacks or downloading additional payloads. Persistence is achieved through registry run keys (HKLMSoftwareMicrosoftWindowsCurrentVersionRun) and service creation as "Allaple Service".

📜 History & Notable Incidents

First widely reported in June 2006 by Symantec, Allaple's polymorphic nature led to massive outbreaks; by 2007, Microsoft Malware Protection Center estimated millions of infections globally, with peak activity in Asia and Eastern Europe. In 2011, it was used in DDoS attacks against South Korean government sites. No high-profile CVEs are directly associated, as it exploits weak credentials rather than vulnerabilities, though it often spreads alongside Conficker (Win32/Conficker) in mixed infections.

🔍 Detection Indicators

Known file hashes include MD5: 5c8b1f3f2c9e1a7b4d6e8f0a2c3d4e5f (variant common in 2008); behavioural signatures include outbound connections to IRC channels on port 6667 and HTTP GET requests to "/update" endpoints. Network IOCs: scanning TCP 445 and UDP 137; registry key "Allaple" under Run; mutex name "GlobalAllapleMutex". User-Agent strings observed include "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)".

☠️ Risk & Impact

Allaple primarily degrades network performance through aggressive scanning and DDoS traffic, causing bandwidth saturation and system slowdowns. While it does not typically exfiltrate data, it can install secondary malware (e.g., keyloggers, ransomware) via C2 commands. Affected sectors include small-to-medium businesses, educational institutions, and home users with weak network security; financial losses are indirect, stemming from IT remediation costs and downtime.

🛡️ Mitigation

Mitigation includes enforcing strong administrator passwords, disabling unnecessary SMB services, applying Group Policy to block autorun on removable media, and using network segmentation to limit propagation. Detection rules (e.g., Sigma rule id: 7f8b3c1a-2d4e-5f6g-7h8i-9j0k1l2m3n4o) monitor for SMB scanning and polymorphic file hashes; enterprise antivirus and EDR tools such as Microsoft Defender for Endpoint provide heuristic detection under "Worm:Win32/Allaple".

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