Buer Loader

malware OpenTrojan Threat Intelligence

Loader malware

Source Attribution

Origin
MITRE
Source
Researchers
Verified
2026-08-26T16:11:50.351Z
Confidence
high

Source: Researchers · Verified: 2026-08-26T16:11:50.351Z · Confidence: high

Security Timeline

  • discovered Buer Loader first observed
  • updated Encyclopedia entry reviewed (Phase 45C)

Quick Answer

Buer is a loader distributed via malspam to deliver Cobalt Strike and ransomware access. (attributes recorded from Researchers).

Definition

Buer is a loader distributed via malspam to deliver Cobalt Strike and ransomware access.

Overview

Buer is a loader distributed via malspam to deliver Cobalt Strike and ransomware access.

Behavior

  • Dropper to Cobalt Strike/ransomware

First Seen

2019-07

Target

Loader malware

Malware Intelligence

Family: Buer Loader

Techniques: T1566, T1105

Targets: Loader malware

Behavior:
  • Dropper to Cobalt Strike/ransomware

References

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  5. Sources — NVD, CISA KEV, MITRE ATT&CK, vendor advisories.
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