Suspicious curl Download Spawned by Excel via IQY Attachment (via process_creation)

ATT&CK techniques

Execution → C2

Recon
Resource Dev
Initial Access
Execution
- T1204.002Malicious File
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1105Ingress Tool Transfer
Exfiltration
Impact

What it detects

This rule detects Excel spawning a command shell that runs curl, the initial execution chain triggered by the malicious IQY attachment in the Bitter APT PTCL campaign. Office applications launching curl through cmd to fetch remote payloads is not legitimate document behavior. This parent-child chain indicates weaponized document execution.

Reporting behind it

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Suspicious curl Download Spawned by Excel via IQY Attachment (via process_creation)

Pivot detection · T1105 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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