ArcaneDoor included hooking the processHostScanReply() function on victim Cisco ASA devices.3
campaign
ArcaneDoor C0046
- First seen
- July 2023
- Last seen
- April 2024
- Created
- 6 January 2025
- Last modified
- 31 July 2026
ArcaneDoor is a campaign targeting networking devices from Cisco and other vendors between July 2023 and April 2024, primarily focused on government and critical infrastructure networks. ArcaneDoor is associated with the deployment of the custom backdoors Line Runner and Line Dancer. ArcaneDoor is attributed to a group referred to as UAT4356 or STORM-1849, and is assessed to be a state-sponsored campaign.[1][2]
25
Techniques70th pct
12
TacticsTop 14%
2
Tools & malware63rd pct
0
Threat groupsNone recorded
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference C0046
ArcaneDoor included scripted exfiltration of collected data.4
ArcaneDoor involved the use of digital certificates on adversary-controlled network infrastructure that mimicked the formatting used by legitimate Cisco ASA appliances.5
ArcaneDoor used malicious boot scripts to install the Line Runner backdoor on victim devices.6
ArcaneDoor included network packet capture and sniffing for data collection in victim environments.78
ArcaneDoor included use of existing command and control channels for data exfiltration.910
Standing C0046
Reach is how much of ATT&CK this campaign touches. Coverage is how well defended each thing it does is, as a median per technique rather than a total — a total would just restate the reach. Each figure is ranked against all 56 ATT&CK campaigns only where that population actually spreads. Where most of the population shares one value, a percentile would rank the tie instead of the entity, so the raw value is shown and no rank is claimed.
Reach
Techniques2570th pct
70th percentile · 70% of 56 ATT&CK campaigns have this many Enterprise techniques or fewer.
Tactics12Top 14%
86th percentile · 86% of 56 ATT&CK campaigns have this many tactics spanned or fewer.
Tools & malware263rd pct
63rd percentile · 63% of 56 ATT&CK campaigns have this many tools and malware or fewer.
Threat groups055% tie · 3 values
55% of the population shares a single value across only 3 distinct values, so a percentile here would rank the tie, not the entity.
Coverage
Rules / technique14med55th pct
55th percentile · 55% of 56 ATT&CK campaigns have this many detection rules per technique or fewer.
Tests / technique2
Detection coverage C0046
1081 distinct rules cover the 25 techniques recorded for this campaign. The 1160 technique-to-rule mappings resolve to 1081 distinct rules, because one rule can cover several techniques. 670 Sigma · 411 Splunk.
24 covered by at least one rule1 with no coverage1081 distinct rules in total
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