Exbyte is an exfiltration tool written in Go that is uniquely associated with BlackByte operations. Observed since 2022, Exbyte transfers collected files to online file sharing and hosting services.[1]
9
Techniques44th pct
4
Tactics32nd 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.
Exbyte enumerates all document files on an infected machine, then creates a summary of these items including filename and directory location prior to exfiltration to cloud hosting services.4
Exbyte checks for the presence of a configuration file before completing execution.7
Stealth1 detection rules
Standing S1179
Reach is how much of ATT&CK this malware 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
Techniques944th pct
44th percentile · 56% of 825 ATT&CK software entries have more Enterprise techniques.
Tactics432nd pct
32nd percentile · 68% 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 / technique20med47th pct
47th percentile · 53% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique9med
Exbyte detections S1179
159 distinct rules cover the 9 techniques recorded for this malware. 112 Sigma · 47 Splunk.
9 covered by at least one rule159 distinct rules in total
Showing 1-50 of 100+ rules
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MITRE ATT&CK
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Adversaries may attempt to find domain-level groups and permission settings. (...)
The following analytic detects the use of CertUtil.exe with the 'decode' argument, which may indicate an attempt to decode a previously encoded file, potentially containing malicious payloads. (...)
The following analytic detects the creation of specific AzureHound-related files, such as `*-azurecollection.zip` and various `.json` files, on disk. (...)
The following analytic detects the creation of files typically associated with SharpHound, a reconnaissance tool used for gathering domain and trust data. (...)
The following analytic detects the use of the `Get-WMIObject Win32_Group` command executed via PowerShell to enumerate local groups on an endpoint. (...)
The following analytic detects suspicious Base64 decode operations that may indicate malicious activity, such as data exfiltration or execution of encoded commands. (...)
The following analytic detects suspicious database file and directory discovery activities, which may signal an attacker attempt to locate and assess critical database assets on a compromised system. (...)
The following analytic detects suspicious file and directory discovery activities, which may indicate an attacker's effort to locate sensitive documents and files on a compromised system. (...)
The following analytic detects suspicious creation of hidden files and directories, which may indicate an attacker's attempt to conceal malicious activities or unauthorized data. (...)
The following analytic detects suspicious discovery of virtual disk files and directories, which may indicate an attacker's attempt to locate and access virtualized storage environments. (...)