Skip to main content
Mallory
Back to threat actors
Espionage4 malware families

earth_bluecrow

Also known asearth_bluecrow

Earth Bluecrow is a suspected Chinese APT involved in cyber espionage. The provided content states that the group has used a new controller for the BPFDoor backdoor since 2021 and was suspected in the breach of a Korean telecommunications company in April 2025. Its targeting has included organizations in the communications, finance, and retail sectors across South Korea, Hong Kong, Myanmar, Malaysia, and Egypt, with mention of activity in Asia and the Middle East. The group is described as using BPFDoor, a backdoor that leverages Berkeley Packet Filter for stealthy communication and can be activated by a network packet containing a magic sequence. According to the content, BPFDoor supports long-term concealment, lateral movement, and access to sensitive data within victim networks. The campaign is described as ongoing, and the initial access vector and exploited vulnerabilities were still under investigation. No additional aliases or sub-groups were provided beyond Earth Bluecrow.

Share:
Are they targeting you?

Know when an actor pivots toward your sector

Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.

Start free trial
OPERATIONAL PROFILE

Targeting

Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.

Who they target

Sectors the actor has been observed targeting.

  • communication
  • finance
  • retail
MITRE ATT&CK

Tradecraft

10 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.

9 of 15 tactics16 techniques×N= number of intelligence reports citing this technique
MITRE ATT&CK
TA0001
Initial Access
1 technique
T1190
Exploit Public-Facing Application
TA0002
Execution
1 technique
T1059
Command and Scripting Interpreter
TA0003
Persistence
1 technique
T1547
Boot or Logon Autostart Execution
T1547.006
Kernel Modules and Extensions
TA0004
Privilege Escalation
1 technique
T1547
Boot or Logon Autostart Execution
T1547.006
Kernel Modules and Extensions
TA0005
Stealth
1 technique
T1036
Masquerading
TA0006
Credential Access
3 techniques
T1003
OS Credential Dumping
T1056
Input Capture
T1056.001
Keylogging
T1110
Brute Force
TA0008
Lateral Movement
1 technique
T1021
Remote Services
TA0009
Collection
1 technique
T1056
Input Capture
T1056.001
Keylogging
TA0011
Command and Control
2 techniques
T1095
Non-Application Layer Protocol
T1572
Protocol Tunneling
ARSENAL

Associated malware families

4 malware families attributed to this actor across reporting.

FamilyContextEvidenceLast seen
BPFDoorOne of the most recognized tools in its malware arsenal is a Linux backdoor called BPFDoor. "Unlike conventional malware, BPFdoor does not expose listening ports or maintain visible command-and-control channels. Instead, it abuses Berkeley Packet Filter (BPF) functionality to inspect network traffic directly inside the kernel, activating only when it receives a specifically crafted trigger packet."3Mar 26, 2026
CrossC2Upon gaining a successful foothold, Linux-compatible beacon frameworks such as CrossC2 are deployed to facilitate post-exploitation activities.1Mar 26, 2026
SliverAlso dropped are Sliver, TinyShell (a Unix backdoor), keyloggers, and brute-force utilities to facilitate credential harvesting and lateral movement.1Mar 26, 2026
TINYSHELLAlso dropped are Sliver, TinyShell (a Unix backdoor), keyloggers, and brute-force utilities to facilitate credential harvesting and lateral movement.1Mar 26, 2026
ACTIVITY FEED

Recent activity

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

1 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: sector and geo overlap with your footprint, the IOCs they’re burning right now, detection coverage, and what to do next.
Start free trial
Target overlap

Match sector + geo + tech-stack targeting against your real footprint.

Tradecraft mapping10

Every observed MITRE ATT&CK technique, grouped by tactic.

Malware arsenal4

Families this actor is known to deploy, with IOCs and behavior.

Exploited CVEs

CVEs this actor has used in known campaigns.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Observables

Domains, IPs, and hashes tied to this actor, refreshed continuously.