Brazilian threat group distributing banking trojans targeting Latin American financial institutions through malspam campaigns. This profile is mapped to MITRE ATT&CK G1026 and covers attribution, tooling, targeting, and defensive recommendations based on observed campaigns.
Overview & Attribution
Malteiro (also tracked as None publicly documented) is a threat group attributed to Brazil. The group primarily targets Latin American banking, financial for intelligence collection and operational objectives aligned with state interests.
This group is tracked as G1026 in the MITRE ATT&CK framework. All techniques referenced in this report are mapped to ATT&CK for consistent threat modeling and detection engineering.
Arsenal & Tools
Known tools and malware associated with Malteiro include:
- Mekotio
- Grandoreiro
- banking trojans
Targeting & Operations
Malteiro operations focus on Latin American banking, financial. The group typically gains initial access through spear-phishing, exploitation of public-facing applications, or strategic web compromises before deploying custom implants for persistent access and data exfiltration.
Organizations in the Latin American banking sector should treat Malteiro as a relevant threat and validate their detection coverage against the MITRE ATT&CK techniques listed below.
MITRE ATT&CK Mapping
Key techniques observed in Malteiro operations:
| Technique ID | Technique Name | Tactical Context |
|---|---|---|
| T1566.001 | T1566.001 | Observed in Malteiro campaigns |
| T1204.002 | T1204.002 | Observed in Malteiro campaigns |
| T1059.001 | T1059.001 | Observed in Malteiro campaigns |
| T1185 | T1185 | Observed in Malteiro campaigns |
Full ATT&CK mapping: https://attack.mitre.org/groups/G1026/
Notable Campaigns
This threat group has been active in operations targeting Latin American banking, financial. Security researchers have documented campaigns involving Mekotio and other tools deployed against organizations in multiple countries. Attribution confidence varies by campaign, but consistent infrastructure and TTP overlap links activity to Brazil-nexus operations.
Detection & Defense
Recommended defensive measures against Malteiro:
- Network monitoring: Detect C2 beaconing patterns associated with Mekotio and related implants
- Endpoint detection: Deploy behavioral rules for the ATT&CK techniques above, particularly T1566.001 and T1204.002
- Email security: Implement robust phishing defenses including URL sandboxing and attachment detonation
- Patch management: Prioritize patching of internet-facing applications exploited by this group
- Threat hunting: Proactively hunt for IOCs and behavioral indicators mapped to G1026 in MITRE ATT&CK
How Mjolnir Security Can Help
Defend Against Malteiro
Mjolnir Security provides tailored threat intelligence, detection engineering, and incident response services to help organizations defend against Brazil-nexus threat actors.
Contact us: mjolnirsecurity.com
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