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FamousSparrow, also tracked as Glowworm and Earth Estries, is a China-linked espionage threat actor associated with intrusions against government, telecommunications, academic, and other organizations across multiple regions. The group has been linked to use of the Zingdoor backdoor and has shown operational overlap with broader China-nexus tooling and tradecraft. Reporting has associated FamousSparrow-related activity with compromises in the Middle East, Africa, South America, and the United States, including government departments, a telecommunications company, and a university. The actor’s operations are characterized by stealthy post-compromise access, malware staging through DLL sideloading, and use of modular backdoors and loaders. Tooling associated with activity linked to this cluster includes Zingdoor, ShadowPad, KrustyLoader, and Sliver, alongside credential-dumping and proxy utilities. Observed behaviors include initial access through exploitation of public-facing applications, persistence, credential theft, privilege escalation, lateral movement, and command execution. The group has also used legitimate binaries to sideload malicious components and has leveraged common post-exploitation utilities to support reconnaissance, access expansion, and defense evasion. FamousSparrow is assessed as a Chinese threat actor primarily engaged in cyber espionage. Its victimology and tradecraft align with intelligence collection objectives rather than financially motivated ransomware or extortion activity. Earth Estries is used by some vendors for the same cluster, and Glowworm appears as another alias in public reporting.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Sectors the actor has been observed targeting.
Geographies tied to known operations.
Attributed origin per open-source reporting.
3 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.
4 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
China-linked intrusion activity described compromising telecom and government entities by exploiting a SharePoint vulnerability and deploying the Zingdoor malware.
Previously associated with Zingdoor and later observed using ShadowPad in espionage-oriented intrusions. The current campaign shows tooling overlap with prior Glowworm activity, but the activity is not conclusively attributed to Glowworm.
Match sector + geo + tech-stack targeting against your real footprint.
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.