S1203: J-magic
J-magic is a custom variant of the cd00r backdoor tailored to target Juniper routers that was first observed during the J-magic Campaign in mid-2023. J-magic monitors TCP traffic for five predefined parameters or "magic packets" to be sent by the attackers before activating on compromised devices.[1]
Security context for executives and security teams
S1203: J-magic describes [J-magic](https://attack.mitre.org/software/S1203) is a custom variant of the [cd00r](https://attack.mitre.org/software/S1204) backdoor tailored to target Juniper routers that was first observed during the [J-magic Campaign](https://attack.mitre.org/campaigns/C0050) in mid-2023. [J-magic](https://attack.mitre.org/software/S1203) monitors TCP traffic for five predefined parameters or "magic packets" to be sent by the attackers before activating on compromised devices.(Citation: Lumen J-Magic JAN 2025)
Executive priority
S1203: J-magic is an official MITRE ATT&CK software. Glexia treats it as defensive behavior context for prioritizing monitoring, control validation, and response planning without using the object by itself as an attribution claim.
Technical view
Security teams should validate S1203: J-magic by reviewing the official ATT&CK relationships, mapped tactics (the mapped ATT&CK tactic context), supported platforms (Network Devices), and available local telemetry before making detection or mitigation decisions.
Likely telemetry
- Official ATT&CK relationships and object metadata
- Network, endpoint, and security-tool telemetry
Detection direction
- Validate whether S1203: J-magic appears in your detection coverage and tabletop scenarios.
- Use the object to align executive risk language with SOC, incident response, and detection engineering work.
- Do not treat ATT&CK relationship context as attribution without corroborating evidence.
Mitigation priorities
- Map the object to existing controls and identify missing telemetry or response ownership.
- Prioritize mitigations that reduce exposure on the listed platforms and tactics.
- Review adjacent ATT&CK relationships before changing policy, detections, or reporting language.
Additional notes and limits
Baseline Glexia take generated from the official MITRE ATT&CK STIX object, source hash, tactics, platforms, and detection fields. It is safe to replace with a richer model-generated take for the same source hash later.
This baseline take is source-grounded and schema-validated, but it does not include environment-specific telemetry, incident evidence, or threat-intelligence corroboration.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
J-magic
J-magic is a custom variant of the cd00r backdoor tailored to target Juniper routers that was first observed during the J-magic Campaign in mid-2023. J-magic monitors TCP traffic for five predefined parameters or "magic packets" to be sent by the attackers before activating on compromised devices.[1]
How security teams should use this page
Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.
Techniques used
This mirrors the MITRE pattern of making group, software, campaign, and technique relationships scannable. Relationship notes come from mirrored ATT&CK relationship text when available.
| Domain | ID | Name | Relationship / procedure |
|---|---|---|---|
| Enterprise | T1036.005 | Match Legitimate Resource Name or LocationSub-technique | |
| Enterprise | T1070.003 | Clear Command HistorySub-technique | |
| Enterprise | T1095 | Non-Application Layer Protocol | |
| Enterprise | T1016 | System Network Configuration Discovery | |
| Enterprise | T1573.002 | Asymmetric CryptographySub-technique | |
| Enterprise | T1205 | Traffic Signaling | |
| Enterprise | T1040 | Network Sniffing | |
| Enterprise | T1059.004 | Unix ShellSub-technique |
Groups, software, and campaigns
C0050: J-magic Campaign
The J-magic Campaign was active from mid-2023 to at least mid-2024 and featured the use of the J-magic backdoor, a custom cd00r variant tailored for use against Juniper routers. The J-magic Campaign targeted Junos OS routers serving as VPN gateways primarily in the semiconductor, energy, manufacturing, and IT sectors. [1]
All related ATT&CK context
Object version and sync metadata
The fields below describe the current mirrored snapshot. When Glexia retains multiple ATT&CK source imports, you can open the table to compare the same object across releases (hashes and MITRE timestamps). For MITRE’s own release notes and roadmap, see ATT&CK resources — Updates.
Imported snapshots across ATT&CK releases(2)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.2 | 1.0 | Current bundle | 6bf6dac897fa… | ||
| 19.1 | 1.0 | Older bundle | 6bf6dac897fa… |
Mirrored ATT&CK source object
The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.
External references and citations
MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.
- [1]Lumen J-Magic JAN 2025
Black Lotus Labs. (2025, January 23). The J-Magic Show: Magic Packets and Where to find them. Retrieved February 17, 2025.
Open source URL - [2]mitre-attackS1203Open source URL
Source: MITRE ATT&CK®. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. MITRE ATT&CK and ATT&CK are registered trademarks of The MITRE Corporation. Glexia is not affiliated with or endorsed by MITRE.