MalwareRansomware

TeamsPhisher

TeamsPhisher is a tool used to distribute malware via Microsoft Teams. Microsoft reporting cited in the provided content states that access brokers associated with the Black Basta ransomware ecosystem used TeamsPhisher to distribute DarkGate through Teams after shifts away from earlier email-based delivery chains such as Qakbot. The content also states that Storm-1674 used Teams to deploy TeamsPhisher and other red teaming tools, injecting DarkGate and other malware. More broadly, the surrounding activity reflects abuse of Teams for social engineering and malware delivery, with Teams used by threat actors for reconnaissance, persistence, data exfiltration, and ransom-note delivery. High-confidence associations in the content link TeamsPhisher specifically to Teams-based malware delivery, especially DarkGate, and to threat activity tracked by Microsoft as Storm-1674 and access brokers operating in the Black Basta ecosystem.

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MITRE ATT&CK

Techniques & procedures

1 distinct technique documented for this family, organized by ATT&CK tactic.

Initial Access

1 technique

T1566.003Spearphishing via ServiceEvidence1

In July 2023, Storm-0324 began using phishing lures sent over Teams with malicious links leading to a malicious SharePoint-hosted file. For this activity, Storm-0324 most likely relies on a publicly available tool called TeamsPhisher.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app

scworldNews

Oct 9, 2025

Microsoft Teams exploitation in cyberattacks ramp up

TeamsPhisher is a tool used to facilitate phishing and payload delivery via Microsoft Teams, often as part of initial access operations.

thecyberwire comNews

Aug 28, 2024

Black Basta and the Use of LLMs by Threat Actors

Tool used to deliver malware (notably DarkGate) via Microsoft Teams as part of initial access/social engineering activity linked to Black Basta access brokers.

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Threat actor attribution

Named campaigns wielding this family, with evidence pinned to each claim.

Exploited vulnerabilities

CVEs this family uses for access and lateral movement.

Detection signatures

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MITRE ATT&CK mapping1

Every documented technique, ranked by evidence weight.

Researcher chatter

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