title: HackTool - BabyShark Agent Default URL Pattern
id: 304810ed-8853-437f-9e36-c4975c3dfd7e
status: test
description: Detects Baby Shark C2 Framework default communication patterns
references:
    - https://nasbench.medium.com/understanding-detecting-c2-frameworks-babyshark-641be4595845
author: Florian Roth (Nextron Systems)
date: 2021-06-09
modified: 2024-02-15
tags:
    - attack.command-and-control
    - attack.t1071.001
logsource:
    category: proxy
detection:
    selection:
        c-uri|contains: 'momyshark\?key='
    condition: selection
falsepositives:
    - Unlikely
level: critical

title: Suspicious C2 Activities
id: f7158a64-6204-4d6d-868a-6e6378b467e0
status: test
description: |
    Detects suspicious activities as declared by Florian Roth in its 'Best Practice Auditd Configuration'.
    This includes the detection of the following commands; wget, curl, base64, nc, netcat, ncat, ssh, socat, wireshark, rawshark, rdesktop, nmap.
    These commands match a few techniques from the tactics "Command and Control", including not exhaustively the following; Application Layer Protocol (T1071), Non-Application Layer Protocol (T1095), Data Encoding (T1132)
references:
    - https://github.com/Neo23x0/auditd
author: Marie Euler
date: 2020-05-18
modified: 2021-11-27
tags:
    - attack.command-and-control
logsource:
    product: linux
    service: auditd
    definition: |
        Required auditd configuration:
        -w /usr/bin/wget -p x -k susp_activity
        -w /usr/bin/curl -p x -k susp_activity
        -w /usr/bin/base64 -p x -k susp_activity
        -w /bin/nc -p x -k susp_activity
        -w /bin/netcat -p x -k susp_activity
        -w /usr/bin/ncat -p x -k susp_activity
        -w /usr/bin/ss -p x -k susp_activity
        -w /usr/bin/netstat -p x -k susp_activity
        -w /usr/bin/ssh -p x -k susp_activity
        -w /usr/bin/scp -p x -k susp_activity
        -w /usr/bin/sftp -p x -k susp_activity
        -w /usr/bin/ftp -p x -k susp_activity
        -w /usr/bin/socat -p x -k susp_activity
        -w /usr/bin/wireshark -p x -k susp_activity
        -w /usr/bin/tshark -p x -k susp_activity
        -w /usr/bin/rawshark -p x -k susp_activity
        -w /usr/bin/rdesktop -p x -k susp_activity
        -w /usr/local/bin/rdesktop -p x -k susp_activity
        -w /usr/bin/wlfreerdp -p x -k susp_activity
        -w /usr/bin/xfreerdp -p x -k susp_activity
        -w /usr/local/bin/xfreerdp -p x -k susp_activity
        -w /usr/bin/nmap -p x -k susp_activity
        (via https://github.com/Neo23x0/auditd/blob/ddf2603dbc985f97538d102f13b4e4446b402bae/audit.rules#L336)
detection:
    selection:
        key: 'susp_activity'
    condition: selection
falsepositives:
    - Admin or User activity
level: medium

title: Potential Network Sniffing Activity Using Network Tools
id: ba1f7802-adc7-48b4-9ecb-81e227fddfd5
status: test
description: |
    Detects potential network sniffing via use of network tools such as "tshark", "windump".
    Network sniffing refers to using the network interface on a system to monitor or capture information sent over a wired or wireless connection.
    An adversary may place a network interface into promiscuous mode to passively access data in transit over the network, or use span ports to capture a larger amount of data.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1040/T1040.md
author: Timur Zinniatullin, oscd.community, Nasreddine Bencherchali (Nextron Systems)
date: 2019-10-21
modified: 2023-02-20
tags:
    - attack.credential-access
    - attack.discovery
    - attack.t1040
logsource:
    category: process_creation
    product: windows
detection:
    selection_tshark:
        Image|endswith: '\tshark.exe'
        CommandLine|contains: '-i'
    selection_windump:
        Image|endswith: '\windump.exe'
    condition: 1 of selection_*
falsepositives:
    - Legitimate administration activity to troubleshoot network issues
level: medium