MechaFlounder has the ability to identify the username and hostname on a compromised host.2
tool
MechaFlounder S0459
- Type
- malware
- Platform
- Windows
- Created
- 27 May 2020
- Last modified
- 25 April 2025
MechaFlounder is a python-based remote access tool (RAT) that has been used by APT39. The payload uses a combination of actor developed code and code snippets freely available online in development communities.[1]
8
Techniques38th 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 S0459
MechaFlounder has been downloaded as a file named lsass.exe, which matches the legitimate Windows file.3
MechaFlounder has the ability to send the compromised user's account name and hostname within a URL to C2.4
MechaFlounder has the ability to run commands on a compromised host.5
MechaFlounder uses a python-based payload.6
MechaFlounder has the ability to use HTTP in communication with C2.7
Standing S0459
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
Techniques838th pct
38th percentile · 62% of 825 ATT&CK software entries have more Enterprise techniques.
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 / technique37medTop 15%
85th percentile · 85% of 825 ATT&CK software entries have this many detection rules per technique or fewer.
Tests / technique3.5med
Detection coverage S0459
343 distinct rules cover the 8 techniques recorded for this tool. The 355 technique-to-rule mappings resolve to 343 distinct rules, because one rule can cover several techniques. 242 Sigma · 101 Splunk.
8 covered by at least one rule343 distinct rules in total
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