Ruben Groenewoud
96 lines
4.1 KiB
Markdown
96 lines
4.1 KiB
Markdown
# Persistence via Desktop Bus (D-Bus)
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---
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## Metadata
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- **Author:** Elastic
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- **Description:** This hunt identifies potential persistence mechanisms leveraging the Desktop Bus (D-Bus) system on Linux. D-Bus is an inter-process communication (IPC) system that facilitates communication between various system components and applications. Attackers can exploit D-Bus by creating or modifying services, configuration files, or system policies to maintain persistence or execute unauthorized actions. This hunt monitors suspicious process activity related to D-Bus, tracks changes to key D-Bus configuration and service files, and retrieves metadata for further analysis. The approach helps analysts identify and respond to persistence techniques targeting D-Bus.
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- **UUID:** `2223bbda-b931-4f33-aeb4-0e0732a370dd`
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- **Integration:** [endpoint](https://docs.elastic.co/integrations/endpoint)
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- **Language:** `[ES|QL, SQL]`
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- **Source File:** [Persistence via Desktop Bus (D-Bus)](../queries/persistence_via_desktop_bus.toml)
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## Query
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```sql
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sql
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from logs-endpoint.events.process-*
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| keep @timestamp, host.os.type, event.type, event.action, process.name, process.parent.name, process.command_line, process.executable, process.parent.executable, agent.id
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| where @timestamp > now() - 30 day
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| where host.os.type == "linux" and event.type == "start" and event.action == "exec" and (
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process.parent.name == "dbus-daemon" or process.name == "dbus-send"
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)
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| stats cc = count(), agent_count = count_distinct(agent.id) by process.command_line, process.executable, process.parent.executable
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| where agent_count <= 3 and cc < 15
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| sort cc asc
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| limit 100
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```
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```sql
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sql
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from logs-endpoint.events.file-*
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| keep @timestamp, host.os.type, event.type, event.action, file.path, file.extension, process.name, process.executable, agent.id
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| where @timestamp > now() - 30 day
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| where host.os.type == "linux" and event.type in ("creation", "change") and (
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file.path like "/usr/share/dbus-1/*" or
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file.path like "/usr/local/share/dbus-1/*" or
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file.path like "/etc/dbus-1/*" or
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file.path like "/home/*/.local/share/dbus-1/*"
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) and not (
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file.extension in ("swp", "dpkg-new") or
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process.name in ("dnf", "yum", "dpkg")
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)
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| stats cc = count(), agent_count = count_distinct(agent.id) by file.path, process.executable
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| where agent_count <= 3
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| sort cc asc
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| limit 100
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```
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```sql
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sql
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SELECT
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f.filename,
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f.path,
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u.username AS file_owner,
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g.groupname AS group_owner,
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datetime(f.atime, 'unixepoch') AS file_last_access_time,
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datetime(f.mtime, 'unixepoch') AS file_last_modified_time,
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datetime(f.ctime, 'unixepoch') AS file_last_status_change_time,
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datetime(f.btime, 'unixepoch') AS file_created_time,
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f.size AS size_bytes
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FROM
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file f
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LEFT JOIN
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users u ON f.uid = u.uid
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LEFT JOIN
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groups g ON f.gid = g.gid
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WHERE (
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f.path LIKE '/usr/share/dbus-1/system-services/%'
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OR f.path LIKE '/usr/local/share/dbus-1/system-services/%'
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OR f.path LIKE '/etc/dbus-1/system.d/%'
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OR f.path LIKE '/usr/share/dbus-1/system.d/%'
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OR f.path LIKE '/usr/share/dbus-1/session-services/%'
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OR f.path LIKE '/home/%/.local/share/dbus-1/services/%'
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OR f.path LIKE '/etc/dbus-1/session.d/%'
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OR f.path LIKE '/usr/share/dbus-1/session.d/%'
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)
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AND (mtime > strftime('%s', 'now') - (7 * 86400)); -- Modified in the last 7 days
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```
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## Notes
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- Monitors processes related to D-Bus, such as `dbus-daemon` and `dbus-send`, to identify unauthorized or anomalous executions indicative of persistence or abuse.
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- Tracks creations and modifications to critical D-Bus directories, including `/usr/share/dbus-1/`, `/usr/local/share/dbus-1/`, `/etc/dbus-1/`, and `~/.local/share/dbus-1/`, which may indicate malicious activity.
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- Retrieves metadata for D-Bus service and configuration files, such as file ownership, access times, and modification timestamps, to detect unauthorized changes.
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- Focuses on recent changes within the last 7 days to identify timely indicators of compromise while maintaining historical context for analysis.
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## MITRE ATT&CK Techniques
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- [T1543](https://attack.mitre.org/techniques/T1543)
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## License
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- `Elastic License v2`
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