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mukul975
101 lines
2.7 KiB
Markdown
101 lines
2.7 KiB
Markdown
# Linux Persistence Mechanisms Detection API Reference
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## Crontab Inspection Commands
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```bash
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# List current user crontab
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crontab -l
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# List crontab for a specific user (requires root)
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crontab -l -u username
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# List all system cron jobs
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ls -la /etc/cron.d/ /etc/cron.daily/ /etc/cron.hourly/ /etc/cron.weekly/ /etc/cron.monthly/
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cat /etc/crontab
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# Find recently modified cron files
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find /var/spool/cron/ /etc/cron* -mtime -7 -type f 2>/dev/null
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```
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## Systemd Unit Audit Commands
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```bash
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# List all enabled services
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systemctl list-unit-files --type=service --state=enabled
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# List all active timers
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systemctl list-timers --all
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# Show service details
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systemctl cat suspicious.service
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# Find non-package-managed unit files
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find /etc/systemd/system/ -name '*.service' -exec sh -c \
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'dpkg -S "$1" 2>/dev/null || echo "UNMANAGED: $1"' _ {} \;
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# Check for user-level systemd units
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find /home -path '*/.config/systemd/user/*.service' 2>/dev/null
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```
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## LD_PRELOAD Detection
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```bash
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# Check ld.so.preload file
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cat /etc/ld.so.preload 2>/dev/null
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# Check environment for LD_PRELOAD
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env | grep LD_PRELOAD
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cat /proc/*/environ 2>/dev/null | tr '\0' '\n' | grep LD_PRELOAD
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# Check running processes for injected libraries
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for pid in /proc/[0-9]*; do
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grep -l LD_PRELOAD "$pid/environ" 2>/dev/null && echo "PID: $(basename $pid)"
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done
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```
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## Auditd Rules for Persistence Monitoring
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```bash
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# Monitor crontab modifications
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-w /etc/crontab -p wa -k cron_modification
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-w /etc/cron.d/ -p wa -k cron_modification
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-w /var/spool/cron/ -p wa -k cron_modification
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# Monitor systemd unit changes
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-w /etc/systemd/system/ -p wa -k systemd_modification
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# Monitor ld.so.preload
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-w /etc/ld.so.preload -p wa -k ld_preload_modification
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# Monitor shell profiles
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-w /etc/profile -p wa -k profile_modification
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-w /etc/profile.d/ -p wa -k profile_modification
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# Monitor authorized_keys
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-w /root/.ssh/authorized_keys -p wa -k ssh_key_modification
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# Search audit logs for persistence events
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ausearch -k cron_modification --start today
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ausearch -k systemd_modification -i
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```
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## SSH Authorized Keys Audit
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```bash
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# Find all authorized_keys files
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find / -name authorized_keys -type f 2>/dev/null
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# Check for command restrictions in keys
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grep 'command=' /home/*/.ssh/authorized_keys /root/.ssh/authorized_keys 2>/dev/null
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```
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## MITRE ATT&CK Techniques
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| Technique | ID | Persistence Vector |
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| Scheduled Task/Job: Cron | T1053.003 | Crontab entries |
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| Create/Modify System Process: Systemd | T1543.002 | Systemd units |
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| Hijack Execution Flow: LD_PRELOAD | T1574.006 | Shared library injection |
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| Event Triggered Execution: Unix Shell | T1546.004 | .bashrc/.profile |
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| Account Manipulation: SSH Keys | T1098.004 | authorized_keys |
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