Black Basta can check whether the service name FAX is present.7
tool
Black Basta S1070
- Type
- malware
- Platforms
- Windows, ESXi
- Created
- 8 March 2023
- Last modified
- 21 October 2025
Black Basta is ransomware written in C++ that has been offered within the ransomware-as-a-service (RaaS) model since at least April 2022; there are variants that target Windows and VMWare ESXi servers. Black Basta operations have included the double extortion technique where in addition to demanding ransom for decrypting the files of targeted organizations the cyber actors also threaten to post sensitive information to a leak site if the ransom is not paid. Black Basta affiliates have targeted multiple high-value organizations, with the largest number of victims based in the U.S. Based on similarities in TTPs, leak sites, payment sites, and negotiation tactics, security researchers assess the Black Basta RaaS operators could include current or former members of the Conti group.[1][2][3][4][5][6]
26
TechniquesTop 11%
7
Tactics68th 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 S1070
Black Basta can use LDAP queries to connect to AD and iterate over connected workstations.8
Black Basta had added data prior to the Portable Executable (PE) header to prevent automatic scanners from identifying the payload.9
Black Basta has established persistence by creating a new service named FAX after deleting the legitimate service by the same name.101112
The Black Basta dropper has mimicked an application for creating USB bootable drivers.13
Black Basta has used WMI to execute files over the network.14
Standing S1070
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
Techniques26Top 11%
89th percentile · 89% 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 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 / technique15med34th pct
34th percentile · 66% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique7med
Detection coverage S1070
957 distinct rules cover the 26 techniques recorded for this tool. The 1041 technique-to-rule mappings resolve to 957 distinct rules, because one rule can cover several techniques. 648 Sigma · 309 Splunk.
24 covered by at least one rule2 with no coverage957 distinct rules in total
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