AvosLocker has used XOR-encoded strings.4
tool
AvosLocker S1053
- Type
- malware
- Platforms
- Linux, Windows
- Created
- 11 January 2023
- Last modified
- 21 April 2025
AvosLocker is ransomware written in C++ that has been offered via the Ransomware-as-a-Service (RaaS) model. It was first observed in June 2021 and has been used against financial services, critical manufacturing, government facilities, and other critical infrastructure sectors in the United States. As of March 2022, AvosLocker had also been used against organizations in Belgium, Canada, China, Germany, Saudi Arabia, Spain, Syria, Taiwan, Turkey, the United Arab Emirates, and the United Kingdom.[1][2][3]
15
Techniques66th pct
7
Tactics68th pct
0
Threat groupsNone recorded
1
Campaignunranked
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S1053
AvosLocker has used obfuscated API calls that are retrieved by their checksums.5
AvosLocker has been disguised as a .jpg file.6
AvosLocker has discovered system processes by calling RmGetList.7
AvosLocker has searched for files and directories on a compromised network.89
AvosLocker has used a variety of Windows API calls, including NtCurrentPeb and GetLogicalDrives.10
Standing S1053
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
Techniques1566th pct
66th percentile · 66% of 825 ATT&CK software entries have this many Enterprise techniques or fewer.
Tactics768th pct
68th percentile · 68% 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.
Campaign185% 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 / technique9med
Detection coverage S1053
339 distinct rules cover the 15 techniques recorded for this tool. The 351 technique-to-rule mappings resolve to 339 distinct rules, because one rule can cover several techniques. 265 Sigma · 74 Splunk.
14 covered by at least one rule1 with no coverage339 distinct rules in total
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