tool

Gelsemium S0666

Type: malware
Platform: Windows
Created: 30 November 2021
Last modified: 11 April 2024

Gelsemium is a modular malware comprised of a dropper (Gelsemine), a loader (Gelsenicine), and main (Gelsevirine) plug-ins written using the Microsoft Foundation Class (MFC) framework. Gelsemium has been used by the Gelsemium group since at least 2014.[1]

TechniquesTop 6%

TacticsTop 20%

Threat groupsNone recorded

CampaignsNone recorded

Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.

MITRE reference S0666

Data from Local System T1005↗

Gelsemium can collect data from a compromised host.2

Collection22 detection rules

Fallback Channels T1008↗

Gelsemium can use multiple domains and protocols in C2.3

Command and Control5 detection rules

Query Registry T1012↗

Gelsemium can open random files and Registry keys to obscure malware behavior from sandbox analysis.4

Discovery27 detection rules

Fileless Storage T1027.011↗

Gelsemium can store its components in the Registry.5

Stealth4 detection rules

Compression T1027.015↗

Gelsemium has the ability to compress its components.6

Stealthno detection rules

Junk Code Insertion T1027.016↗

Gelsemium can use junk code to hide functions and evade detection.7

Stealthno detection rules

Standing S0666

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

Techniques33Top 6%

94th percentile · 94% of 825 ATT&CK software entries have this many Enterprise techniques or fewer.

Tactics8Top 20%

80th percentile · 80% of 825 ATT&CK software entries have this many tactics spanned or fewer.

Threat groups061% 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 / technique14med29th pct

29th percentile · 71% of 825 ATT&CK software entries have more detection rules per technique.

Tests / technique4med

Detection coverage S0666

957 distinct rules cover the 33 techniques recorded for this tool. The 1006 technique-to-rule mappings resolve to 957 distinct rules, because one rule can cover several techniques. 647 Sigma · 310 Splunk.

30 covered by at least one rule3 with no coverage957 distinct rules in total

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MITRE reference S0666

Reach

Coverage

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