XORIndex Loader has leveraged webservices to identify the public IP of the victim host.2
tool
XORIndex Loader S1248
- Type
- malware
- Platform
- Windows
- Created
- 22 October 2025
- Last modified
- 24 October 2025
XORIndex Loader is a XOR-encoded loader that collects host data, decodes follow-on scripts and acts as a downloader for the BeaverTail malware. XORIndex Loader was first reported in June 2025. XORIndex Loader has been leveraged by North Korea-affiliated threat actors identified as Contagious Interview. XORIndex Loader has been delivered to victims through code repository sites utilizing typo squatting naming conventions of various npm packages.[1]
12
Techniques54th pct
5
Tactics41st pct
1
Threat groupunranked
0
CampaignsNone recorded
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S1248
XORIndex Loader has obfuscated strings using ASCII buffers and TextDecoder.3
XORIndex Loader has encoded module names and C2 URLs as hexadecimal strings in attempts to evade analysis.4
XORIndex Loader has collected the username from the victim host.5
XORIndex Loader has leveraged legitimate package names to mimic frequently utilized tools to entice victims to download and execute malicious payloads.6
XORIndex Loader has exfiltrated victim data using HTTPS POST requests to its C2 servers.7
Standing S1248
Reach is how much of ATT&CK this tool 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 825 ATT&CK software entries 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
Techniques1254th pct
54th percentile · 54% of 825 ATT&CK software entries have this many Enterprise techniques or fewer.
Tactics541st pct
41st percentile · 59% of 825 ATT&CK software entries have more tactics spanned.
Threat group161% tie · 22 values
61% of the population shares a single value across only 22 distinct values, so a percentile here would rank the tie, not the entity.
Campaigns085% tie · 8 values
85% of the population shares a single value across only 8 distinct values, so a percentile here would rank the tie, not the entity.
Coverage
Rules / technique26med64th pct
64th percentile · 64% of 825 ATT&CK software entries have this many detection rules per technique or fewer.
Tests / technique3med
Detection coverage S1248
402 distinct rules cover the 12 techniques recorded for this tool. The 422 technique-to-rule mappings resolve to 402 distinct rules, because one rule can cover several techniques. 284 Sigma · 118 Splunk.
11 covered by at least one rule1 with no coverage402 distinct rules in total
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