SysUpdate can collect information and files from a compromised host.2
tool
SysUpdate S0663
- Type
- malware
- Platforms
- Windows, Linux
- Created
- 29 November 2021
- Last modified
- 21 October 2025
SysUpdate is a backdoor written in C++ that has been used by Threat Group-3390 since at least 2020.[1]
31
TechniquesTop 7%
9
TacticsTop 11%
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 S0663
SysUpdate can collect a list of services on a victim machine.3
SysUpdate can collected the IP address and domain name of a compromised host.4
SysUpdate can contact the DNS server operated by Google as part of its C2 establishment process.5
SysUpdate can store its encoded configuration file within Software\Classes\scConfig in either HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER.8
Standing S0663
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
Techniques31Top 7%
93rd percentile · 93% of 825 ATT&CK software entries have this many Enterprise techniques or fewer.
Tactics9Top 11%
89th percentile · 89% of 825 ATT&CK software entries have this many tactics spanned or fewer.
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 / technique16med38th pct
38th percentile · 62% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique7med
Detection coverage S0663
947 distinct rules cover the 31 techniques recorded for this tool. The 1020 technique-to-rule mappings resolve to 947 distinct rules, because one rule can cover several techniques. 657 Sigma · 290 Splunk.
29 covered by at least one rule2 with no coverage947 distinct rules in total
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