After decrypting itself in memory, RARSTONE downloads a DLL file from its C2 server and loads it in the memory space of a hidden Internet Explorer process. This “downloaded” file is actually not dropped onto the system.2
tool
RARSTONE S0055
- Type
- malware
- Platform
- Windows
- Created
- 31 May 2017
- Last modified
- 25 April 2025
4
TechniquesBottom 17%
4
Tactics32nd 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 S0055
RARSTONE obtains installer properties from Uninstall Registry Key entries to obtain information about installed applications and how to uninstall certain applications.3
RARSTONE uses SSL to encrypt its communication with its C2 server.4
RARSTONE downloads its backdoor component from a C2 server and loads it directly into memory.5
Standing S0055
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
Techniques4Bottom 17%
17th percentile · 83% of 825 ATT&CK software entries have more Enterprise techniques.
Tactics432nd pct
32nd percentile · 68% 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 / technique20.5med48th pct
48th percentile · 52% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique6.5med
Detection coverage S0055
175 distinct rules cover the 4 techniques recorded for this tool. The 176 technique-to-rule mappings resolve to 175 distinct rules, because one rule can cover several techniques. 123 Sigma · 52 Splunk.
4 covered by at least one rule175 distinct rules in total
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