Mustard Tempest has used the filename AutoUpdater.js to mimic legitimate update files and has also used the Cyrillic homoglyph characters С (0xd0a1) and а (0xd0b0), to produce the filename Сhrome.Updаte.zip.56
group
Mustard Tempest G1020
- Created
- 6 December 2023
- Last modified
- 31 July 2026
- Aliases
- Mustard Tempest · DEV-0206 · TA569 · GOLD PRELUDE · UNC1543
Mustard Tempest is an initial access broker that has operated the SocGholish distribution network since at least 2017. Mustard Tempest has partnered with Indrik Spider to provide access for the download of additional malware including LockBit, WastedLocker, and remote access tools.[1][2][3][4]
12
Techniques39th pct
6
Tactics34th pct
2
Tools & malware39th pct
0
CampaignsNone recorded
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference G1020
Mustard Tempest has used implants to perform system reconnaissance on targeted systems.7
Mustard Tempest has deployed secondary payloads and third stage implants to compromised hosts.8
Mustard Tempest has used drive-by downloads for initial infection, often using fake browser updates as a lure.9101112
Mustard Tempest has lured users into downloading malware through malicious links in fake advertisements and spearphishing emails.1314
Mustard Tempest has sent victims emails containing links to compromised websites.15
Standing G1020
Reach is how much of ATT&CK this group 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 176 ATT&CK groups 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
Techniques1239th pct
39th percentile · 61% of 176 ATT&CK groups have more Enterprise techniques.
Tactics634th pct
34th percentile · 66% of 176 ATT&CK groups have more tactics spanned.
Tools & malware239th pct
39th percentile · 61% of 176 ATT&CK groups have more tools and malware.
Campaigns089% tie · 4 values
89% of the population shares a single value across only 4 distinct values, so a percentile here would rank the tie, not the entity.
Coverage
Rules / technique3.5medBottom 9%
9th percentile · 91% of 176 ATT&CK groups have more detection rules per technique.
Tests / technique0med
Detection coverage G1020
233 distinct rules cover the 12 techniques recorded for this group. The 236 technique-to-rule mappings resolve to 233 distinct rules, because one rule can cover several techniques. 153 Sigma · 80 Splunk.
7 covered by at least one rule5 with no coverage233 distinct rules in total
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