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Avalanche is a criminal botnet and malware-distribution infrastructure active since 2009. It was used for money muling schemes, large-scale malware delivery, and as a resilient fast-flux and double fast-flux communication platform for other botnets. Reporting cited in the content links Avalanche to 17 major malware families, including Dridex, TeslaCrypt, Nymaim, Citadel, GOZeuS, VM-ZeuS, Vawtrak, Pandabanker, Ransomlock, Bebloh, Rovnix, Qbot, Matsnu, and URLzone. Investigators estimated it supported up to 500,000 infected devices worldwide per day.
The infrastructure was notable for its use of double fast flux, which increased resistance to takedown and made it attractive as a backend communications provider for other malware operations. The investigation began in 2012 after researchers and German law enforcement linked Ransomlock and Bebloh infections to shared command-and-control infrastructure; both were noted as targeting German speakers. Europol stated Avalanche caused at least EUR 6 million in losses to the German banking industry and likely hundreds of millions of dollars globally.
An international law-enforcement operation involving more than 40 countries, Europol, Eurojust, the FBI, the U.S. Department of Justice, and German authorities disrupted Avalanche in what Europol described as the largest-ever sinkholing action against botnet infrastructure. The operation arrested five individuals and seized, sinkholed, or blocked approximately 800,000 domains associated with the botnet. Germany's BSI analyzed more than 130 TB of captured data, and FKIE helped identify the botnet's server structure.
The content also notes that infected hosts persisted after the takedown: machines infected with Avalanche remained active, continued spreading infection, and remained insecure and potentially available for abuse by other spammers even though the original operators could no longer control them. Additional reporting cited in the content associates the Avalanche gang with abuse of .uk and .be domains. No specific file hashes, domains, IP addresses, or other concrete IOCs are provided in the supplied material.
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6 distinct techniques documented for this family, organized by ATT&CK tactic.
Avalanche scrapes public information from across the web and uses bots to access private groups, gathering data from social networks like Facebook and TikTok and sites specific to whatever community a customer wants to target, like niche forums and databases like contract records.
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Avalanche is a malware discussed in the weekly malware review, but the content does not provide specific details about its functionality or category.
Botnet malware whose infected machines continued spreading infection even after the botnet takedown; compromised hosts remained insecure and open to abuse.
Botnet and fast-flux infrastructure used to distribute a wide variety of malware, support money muling schemes, and provide resilient communication infrastructure for other botnets.
Avalanche is described as a botnet gang abusing country-code domains such as .uk and .be for cybercriminal activity.
Match every observed IP, domain, and hash against your live telemetry.
Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.