Tarrask creates a scheduled task called “WinUpdate” to re-establish any dropped C2 connections.2
tool
Tarrask S1011
- Type
- malware
- Platform
- Windows
- Created
- 1 June 2022
- Last modified
- 16 April 2025
Tarrask is malware that has been used by HAFNIUM since at least August 2021. Tarrask was designed to evade digital defenses and maintain persistence by generating concealed scheduled tasks.[1]
7
Techniques33rd 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 S1011
Tarrask has masqueraded as executable files such as winupdate.exe, date.exe, or win.exe.3
Tarrask is able to create “hidden” scheduled tasks for persistence.4
Tarrask may abuse the Windows schtasks command-line tool to create "hidden" scheduled tasks.5
Tarrask is able to delete the Security Descriptor (SD) registry subkey in order to “hide” scheduled tasks.6
Tarrask leverages token theft to obtain lsass.exe security permissions.7
Standing S1011
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
Techniques733rd pct
33rd percentile · 67% 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 / technique27med68th pct
68th percentile · 68% of 825 ATT&CK software entries have this many detection rules per technique or fewer.
Tests / technique5med
Detection coverage S1011
363 distinct rules cover the 7 techniques recorded for this tool. The 373 technique-to-rule mappings resolve to 363 distinct rules, because one rule can cover several techniques. 230 Sigma · 133 Splunk.
7 covered by at least one rule363 distinct rules in total
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