Tomiris has the ability to collect recent files matching a hardcoded list of extensions prior to exfiltration.2
tool
Tomiris S0671
- Type
- malware
- Created
- 29 December 2021
- Last modified
- 16 April 2025
Tomiris is a backdoor written in Go that continuously queries its C2 server for executables to download and execute on a victim system. It was first reported in September 2021 during an investigation of a successful DNS hijacking campaign against a Commonwealth of Independent States (CIS) member. Security researchers assess there are similarities between Tomiris and GoldMax.[1]
8
Techniques38th pct
8
TacticsTop 20%
0
Threat groupsNone recorded
0
CampaignsNone recorded
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S0671
Tomiris can upload files matching a hardcoded set of extensions, such as .doc, .docx, .pdf, and .rar, to its C2 server.4
Tomiris has used SCHTASKS /CREATE /SC DAILY /TN StartDVL /TR "[path to self]" /ST 10:00 to establish persistence.5
Tomiris can download files and execute them on a victim's system.7
Standing S0671
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.
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 / technique19med42nd pct
42nd percentile · 58% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique3med
Detection coverage S0671
299 distinct rules cover the 8 techniques recorded for this tool. The 309 technique-to-rule mappings resolve to 299 distinct rules, because one rule can cover several techniques. 202 Sigma · 97 Splunk.
8 covered by at least one rule299 distinct rules in total
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