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Sirius Backdoor and Armorsteal Malware Campaigns Target Cryptocurrency Users

Sirius Backdoor and Armorsteal Malware Campaigns Target Cryptocurrency Users

First seen 28 Oct 2026, 03:18 UTC • •

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ThreatCluster AI
ThreatCluster •October 28, 2026 at 05:47 UTC

Broadcom's Trellix and Zscaler researchers reported two distinct malware campaigns targeting cryptocurrency users. The Sirius Backdoor, a C++ malware, is distributed via spear-phishing emails disguised as FedEx messages, leading victims to execute a malicious PowerShell script. This malware enables extensive remote access and espionage capabilities, including credential theft and clipboard manipulation. The Armorsteal malware, spread through SEO poisoning, tricks users into running a rogue PowerShell script that installs malicious Python modules. Armorsteal also captures sensitive data, including passwords and cryptocurrency wallet information. Both malware strains utilize sophisticated techniques to evade detection and exploit user trust. Symantec products are equipped to block these threats, and users are advised to implement strict security measures.

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Timeline

2026-10-27
Sirius Backdoor and Armorsteal malware disclosed
Trellix and Zscaler researchers published findings on two malware strains targeting cryptocurrency users through phishing and SEO poisoning.
Broadcom
2026-10-27
Symantec protection measures announced
Symantec confirmed that its products can detect and block the associated malicious indicators from both malware strains.
Broadcom

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Common questions

How does Sirius Backdoor infect systems?
Sirius Backdoor is delivered via spear-phishing emails that trick users into executing a malicious PowerShell script.
What data does Armorsteal target?
Armorsteal targets sensitive information, including passwords, cryptocurrency wallet files, and SSH keys.
What protective measures should be taken?
Users should implement strong email filtering and ensure that security products are updated to detect these threats.