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Malteiro is a financially motivated Latin American cybercrime threat cluster associated with banking malware activity, including operations involving Mispadu. The actor is linked to Brazil and has targeted Spanish- and Portuguese-speaking victims, with observed targeting evidence tied to Spain, Mexico, and Portugal. Malteiro commonly relies on spearphishing emails and archive-based lures, including malicious ZIP attachments and embedded malicious URLs, to induce user execution and establish initial access. Malteiro exhibits a credential-theft-centric intrusion pattern. It has stolen credentials from web browsers using NirSoft WebBrowserPassView and harvested credentials from mail clients using NirSoft MailPassView. The actor also performs host profiling and victim qualification by collecting machine information such as system architecture, operating system version, computer name, Windows product name, and installed antivirus products. It further uses language-based execution controls, terminating parts of the infection chain when the victim system is not configured for Spanish or Portuguese, indicating regional targeting and operational filtering. The actor also uses obfuscation and staged execution techniques, including Base64-encoded scripts and deobfuscation of downloaded files prior to execution. Overall, Malteiro’s tradecraft combines phishing-driven initial access, user-assisted execution, credential theft from browsers and email clients, system reconnaissance, and defense-aware victim selection consistent with banking-trojan and credential-harvesting operations in the Latin American cybercrime ecosystem.
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27 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
2 malware families attributed to this actor across reporting.
1 CVE this actor has used in observed campaigns. 1 of them exploited in the wild.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Listed as an associated threat actor in detection annotations for Ghostscript exploitation; no specific campaign activity is described in this reference.
Listed as a threat actor associated with the PowerShell P/Invoke process injection API chain detection and related ATT&CK techniques.
Listed in the detection annotations as a threat actor associated with EFI volume mounting / installation-related behavior.
Listed as a threat actor associated with WinPEAS-related post-exploitation/reconnaissance activity in the detection metadata.
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Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.