AgentSmith-HIDS

--The name of this project was inspired by the movie - The Matrix

THIS REPO IS OLD

RELEASE VERSION: https://github.com/bytedance/Elkeid

About AgentSmith-HIDS

Technically, AgentSmith-HIDS is not a Host-based Intrusion Detection System (HIDS) due to lack of rule engine and detection function. However, it can be used as a high performance 'Host Information Collect Agent' as part of your own HIDS solution. The comprehensiveness of information which can be collected by this agent was one of the most important metrics during developing this project, hence it was built to function in the kernel stack and achieve huge advantage comparing to those function in user stack, such as:

Better performance, Information needed are collected in kernel stack to avoid additional supplement actions such as traversal of '/proc'; and to enhance the performance of data transportation, data collected is transferred via shared ram instead of netlink.
Hard to be bypassed, Information collection was powered by specifically designed kernel drive, makes it almost impossible to bypass the detection for malicious software like rootkit, which can deliberately hide themselves.
Easy to be integrated，The AgentSmith-HIDS was built to integrate with other applications and can be used not only as security tool but also a good monitoring tool, or even a good detector of your assets. The agent is capable of collecting the users, files, processes and internet connections for you, so let's imagine when you integrate it with CMDB, you could get a comprehensive map consists of your network, host, container and business (even dependencies). What if you also have a Database audit tool at hand? The map can be extended to contain the relationship between your DB, DB User, tables, fields, applications, network, host and containers etc. Thinking of the possibility of integration with network intrusion detection system and/or threat intelligence etc., higher traceability could also be achieved. It just never gets old.
Kernel stack + User stack，AgentSmith-HIDS also provide user stack module, to further extend the functionality when working with kernel stack module.

Major abilities of AgentSmith-HIDS：

Kernel stack module hooks execve, connect, process inject, create file, DNS query, load LKM behaviors via Kprobe，and is also capable of monitoring containers by being compatible with Linux namespace.
User stack module utilize built in detection functions including queries of User List，Listening ports list，System RPM list，Schedule jobs
AntiRootkit，From: Tyton ,for now add PROC_FILE_HOOK，SYSCALL_HOOK，LKM_HIDDEN，INTERRUPTS_HOOK feature，but only wark on Kernel > 3.10.
Cred Change monitoring (sudo/su/sshd except)
User Login monitoring

Usage scenarios/methods of AgentSmith-HIDS (to be added)

How to detect reverse shell by AgentSmith HIDS

About the compatibility with Kernel version

Kernel > 2.6.25
AntiRootKit > 3.10

About the compatibility with Containers

Source	Nodename
Host	hostname
Docker	container name
k8s	pod name

Composition of AgentSmith-HIDS

Kernel stack module (LKM) Hook key functions via Kprobe to capture information needed.
User stack module Collect data capatured by kernel stack module, perform necessary process and send it to Kafka; Keep sending heartbeat packet to server so process integrity can be identitied; Execute commands received from server.
Agent Server(Optional) Send commands to user stack module and monitoring the status of user stack module.

Execve Hook

Achieved by hooking sys_execve()/sys_execveat()/compat_sys_execve()/compat_sys_execveat(), example:

{
    "uid":"0",
    "data_type":"59",
    "run_path":"/tmp",
    "exe":"/opt/ltp/testcases/bin/growfiles",
    "argv":"growfiles -W gf26 -D 0 -b -i 0 -L 60 -u -B 1000b -e 1 -r 128-32768:128 -R 512-64000 -T 4 -f gfsmallio-35861 -d /tmp/ltp-Ujxl8kKsKY ",
    "pid":"35861",
    "ppid":"35711",
    "pgid":"35861",
    "tgid":"35861",
    "comm":"growfiles",
    "nodename":"test",
    "stdin":"/dev/pts/1",
    "stdout":"/dev/pts/1",
    "sessionid":"3",
    "sip":"192.168.165.1",
    "sport":"61726",
    "dip":"192.168.165.128",
    "dport":"22",
    "sa_family":"1",
    "pid_tree":"1(systemd)->1384(sshd)->2175(sshd)->2177(bash)->2193(fish)->35552(runltp)->35711(ltp-pan)->35861(growfiles)",
    "tty_name":"pts1",
    "socket_process_pid":"2175",
    "socket_process_exe":"/usr/sbin/sshd",
    "SSH_CONNECTION":"192.168.165.1 61726 192.168.165.128 22",
    "LD_PRELOAD":"/root/ldpreload/test.so",
    "user":"root",
    "time":"1579575429143",
    "local_ip":"192.168.165.128",
    "hostname":"test",
    "exe_md5":"01272152d4901fd3c2efacab5c0e38e5",
    "socket_process_exe_md5":"686cd72b4339da33bfb6fe8fb94a301f"
}

Bind Hook

Achieved by hooking sys_bind(), example:

{
    "uid":"0",
    "data_type":"49",
    "sa_family":"2",
    "exe":"/usr/bin/python2.7",
    "pid":"109640",
    "ppid":"215496",
    "pgid":"109640",
    "tgid":"109640",
    "comm":"python",
    "nodename":"n225-117-018",
    "sip":"0.0.0.0",
    "sport":"8000",
    "res":"0",
    "sessionid":"30",
    "user":"root",
    "time":"1587540231936",
    "local_ip_str":"10.225.117.18",
    "hostname_str":"n225-117-018",
    "exe_md5":"4f458165a2129ba549f1b6605ee87e74"
}

Connect Hook

Achieved by hooking tcp_v4_connect()/tcp_v6_connect()/ip4_datagram_connect()/ip6_datagram_connect(), example:

{
    "uid":"0",
    "data_type":"42",
    "sa_family":"2",
    "connect_type":"4",
    "dport":"1025",
    "dip":"180.101.49.11",
    "exe":"/usr/bin/ping",
    "pid":"6294",
    "ppid":"1941",
    "pgid":"6294",
    "tgid":"6294",
    "comm":"ping",
    "nodename":"test",
    "sip":"192.168.165.153",
    "sport":"45524",
    "res":"0",
    "sessionid":"1",
    "user":"root",
    "time":"1575721921240",
    "local_ip":"192.168.165.153",
    "hostname":"test",
    "exe_md5":"735ae70b4ceb8707acc40bc5a3d06e04"
}

DNS Query Hook

Achieved by hooking udp_recvmsg()/udpv6_recvmsg(), example:

{
    "uid":"0",
    "data_type":"601",
    "sa_family":"2",
    "dport":"53",
    "dip":"192.168.165.2",
    "exe":"/usr/bin/ping",
    "pid":"6294",
    "ppid":"1941",
    "pgid":"6294",
    "tgid":"6294",
    "comm":"ping",
    "nodename":"test",
    "sip":"192.168.165.153",
    "sport":"53178",
    "qr":"1",
    "opcode":"0",
    "rcode":"0",
    "query":"www.baidu.com",
    "sessionid":"1",
    "user":"root",
    "time":"1575721921240",
    "local_ip":"192.168.165.153",
    "hostname":"test",
    "exe_md5":"39c45487a85e26ce5755a893f7e88293"
}

Create File Hook

Achieved by hooking security_inode_create(), example:

{
    "uid":"0",
    "data_type":"602",
    "exe":"/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64/jre/bin/java",
    "file_path":"/tmp/kafka-logs/replication-offset-checkpoint.tmp",
    "pid":"3341",
    "ppid":"1",
    "pgid":"2657",
    "tgid":"2659",
    "comm":"kafka-scheduler",
    "nodename":"test",
    "sessionid":"3",
    "user":"root",
    "time":"1575721984257",
    "local_ip":"192.168.165.153",
    "hostname":"test",
    "exe_md5":"215be70a38c3a2e14e09d637c85d5311",
    "create_file_md5":"d41d8cd98f00b204e9800998ecf8427e"
}

Process Inject Hook

Achieved by hooking sys_ptrace(), example:

{
    "uid":"0",
    "data_type":"101",
    "ptrace_request":"4",
    "target_pid":"7402",
    "addr":"00007ffe13011ee6",
    "data":"-a",
    "exe":"/root/ptrace/ptrace",
    "pid":"7401",
    "ppid":"1941",
    "pgid":"7401",
    "tgid":"7401",
    "comm":"ptrace",
    "nodename":"test",
    "sessionid":"1",
    "user":"root",
    "time":"1575722717065",
    "local_ip":"192.168.165.153",
    "hostname":"test",
    "exe_md5":"863293f9fcf1af7afe5797a4b6b7aa0a"
}

Load LKM File Hook

Achieved by hooking load_module(), example:

{
    "uid":"0",
    "data_type":"603",
    "exe":"/usr/bin/kmod",
    "lkm_file":"/root/ptrace/ptrace",
    "pid":"29461",
    "ppid":"9766",
    "pgid":"29461",
    "tgid":"29461",
    "comm":"insmod",
    "nodename":"test",
    "sessionid":"13",
    "user":"root",
    "time":"1577212873791",
    "local_ip":"192.168.165.152",
    "hostname":"test",
    "exe_md5":"0010433ab9105d666b044779f36d6d1e",
    "load_file_md5":"863293f9fcf1af7afe5797a4b6b7aa0a"
}

Cred Change Hook

Achieved by Hook commit_creds()，example：

{
    "uid":"0",
    "data_type":"604",
    "exe":"/tmp/tt",
    "pid":"27737",
    "ppid":"26865",
    "pgid":"27737",
    "tgid":"27737",
    "comm":"tt",
    "old_uid":"1000",
    "nodename":"test",
    "sessionid":"42",
    "user":"root",
    "time":"1578396197131",
    "local_ip":"192.168.165.152",
    "hostname":"test",
    "exe_md5":"d99a695d2dc4b5099383f30964689c55"
}

User Login Alert

{
    "data_type":"1001",
    "status":"Failed",
    "type":"password",
    "user_exsit":"false",
    "user":"sad",
    "from_ip":"192.168.165.1",
    "port":"63089",
    "processor":"ssh2",
    "time":"1578405483119",
    "local_ip":"192.168.165.128",
    "hostname":"localhost.localdomain"
}

PROC File Hook Alert

{
    "uid":"-1",
    "data_type":"700",
    "module_name":"autoipv6",
    "hidden":"0",
    "time":"1578384987766",
    "local_ip":"192.168.165.152",
    "hostname":"test"
}

Syscall Hook Alert

{
    "uid":"-1",
    "data_type":"701",
    "module_name":"diamorphine",
    "hidden":"1",
    "syscall_number":"78",
    "time":"1578384927606",
    "local_ip":"192.168.165.152",
    "hostname":"test"
}

LKM Hidden Alert

{
    "uid":"-1",
    "data_type":"702",
    "module_name":"diamorphine",
    "hidden":"1",
    "time":"1578384927606",
    "local_ip":"192.168.165.152",
    "hostname":"test"
}

Interrupts Hook Alert

{
    "uid":"-1",
    "data_type":"703",
    "module_name":"syshook",
    "hidden":"1",
    "interrupt_number":"2",
    "time":"1578384927606",
    "local_ip":"192.168.165.152",
    "hostname":"test"
}

About Performance of AgentSmith-HIDS

Testing Environment(VM):

CPU	Intel(R) Xeon(R) Platinum 8260 CPU @ 2.40GHz 4Core
RAM	8GB
OS/Kernel	Debian9 / 4.14.81.bm.19-amd64

Testing Load：

ltp -f syscalls

Testing Result(1min):

Hook Handler	Average Delay(us)	TP99(us)	TP95(us)	TP90(us)
connect_entry_handler	0.2914	6.7627	0.355	0.3012
connect_handler	2.1406	18.3801	12.102	7.832
execve_entry_handler	5.9320	13.7034	9.908	8.334
execve_handler	6.8826	26.0584	15.9976	12.6260
security_inode_create_entry_handler	1.9963	9.3042	6.7730	4.6816
security_inode_create_handler	4.2114	13.2165	8.83775	6.534

Original Testing Data:

Benchmark Data

cyclictest testing

cyclictest -p 90 - m -c 0 -i 200 -n -h 100 -q -l 1000000

Uninstall Smith：

# Total: 000999485
# Min Latencies: 00002
# Avg Latencies: 00007
# Max Latencies: 13905
# Histogram Overflows: 00515

install Smith：

# Total: 000999519
# Min Latencies: 00002
# Avg Latencies: 00007
# Max Latencies: 15216
# Histogram Overflows: 00481

time -v /opt/ltp/testcases/bin/execve05 -n 30000

10 times

Install Smith：

Average User Time(s)	Average System Time(s)
22.329	14.885

Uninstall Smith：

Average User Time(s)	Average System Time(s)
22.271	14.395

Documents for deployment and testing purpose:

Quick Start

Special Thanks(Not in order)

Wechat of developer

Wechat channel of '灾难控制局'

We would constantly provide information about the functionalities of AgentSmith-HIDS via this channel, a good place to receive the most updated news:)

License

AgentSmith-HIDS kernel module are distributed under the GNU GPLv2 license.

测试目标	总耗时（s）	延迟影响	平均耗时（μs）
不加任何事件监听	42.3224		0.2116
auditd	47.6929	+12.68%	0.2385

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