class SearchUserDetail(DetectBase):
def __init__(self):
super().__init__(code=ALERT_CODE, title=TITLE, desc=DESC_TEMPLATE)
self.account_info = AccountInfo()
self.account_history = AccountHistory()
def run(self, log: Log):
self.init(log=log)
if log.object_info.type != "SAM_USER":
return
user_name = log.subject_info.user_name
if user_name.endswith("$"):
return
target_sid = log.object_info.name
if not target_sid.startswith("S-1-5-21-"):
return
# 查询自身也忽略
if log.subject_info.user_sid == target_sid:
return
# 判断域名是否存在于需要检查的域名中
domain_name = log.subject_info.domain_name
if filter_domain(domain_name):
return
# 如果账号是管理员 直接忽略
if self.account_info.check_target_is_admin_by_sid(
sid=log.subject_info.user_sid, domain=domain_name):
return
# 判断操作者是否为Users
if not self.account_info.check_target_is_user_by_name(
user_name, domain_name):
return
# 判断是否为敏感用户
if not self.account_info.user_is_sensitive_by_sid(sid=target_sid,
domain=domain_name):
return
ldap = LDAPSearch(domain_name)
target_user_name = str(
ldap.search_by_sid(target_sid, attributes=["cn"])["cn"])
return self._generate_alert_doc(target_user_name=target_user_name)
def _generate_alert_doc(self, **kwargs) -> dict:
source_ip = self._get_source_ip_by_logon_id(
self.log.subject_info.logon_id,
self.log.subject_info.full_user_name)
form_data = {
"source_workstation":
self._get_workstation_by_source_ip(source_ip),
"source_ip": source_ip,
"source_user_name": self.log.subject_info.user_name,
"source_user_sid": self.log.subject_info.user_sid,
"source_logon_id": self.log.subject_info.logon_id,
"source_domain": self.log.subject_info.domain_name,
**kwargs
}
doc = self._get_base_doc(level=self._get_level(),
unique_id=self._get_unique_id(
self.code,
self.log.subject_info.user_name),
form_data=form_data)
return doc
def _get_level(self) -> str:
return LOW_LEVEL
class PsLoggedOn(DetectBase):
def __init__(self):
super().__init__(code=ALERT_CODE, title=TITLE, desc=DESC_TEMPLATE)
self.es = ElasticHelper()
self.account_info = AccountInfo()
def run(self, log: Log):
self.init(log=log)
if log.event_data["ShareName"] != r"\\*\IPC$":
return
if log.event_data["RelativeTargetName"] != "srvsvc":
return
# 忽略域管理员的访问
if self.account_info.check_target_is_admin_by_sid(
sid=log.subject_info.user_sid,
domain=log.subject_info.domain_name):
return
# 存在向前查找，则延迟确认
if "_delay_info" not in log.record:
self.delay_confirm_log()
return
self.es.wait_log_in_database(log.dc_computer_name, log.record_number)
is_match = self._search_forward(log)
if is_match:
return self._generate_alert_doc()
def _generate_alert_doc(self, **kwargs) -> dict:
form_data = {
"source_workstation":
self._get_workstation_by_source_ip(
self.log.source_info.ip_address),
"source_ip":
self.log.source_info.ip_address,
"source_user_name":
self.log.subject_info.user_name,
"source_user_sid":
self.log.subject_info.user_sid,
"source_logon_id":
self.log.subject_info.logon_id,
"source_domain":
self.log.subject_info.domain_name,
"dc_hostname":
self.log.dc_host_name,
**kwargs
}
doc = self._get_base_doc(level=self._get_level(),
unique_id=self._get_unique_id(
self.code,
self.log.source_info.ip_address),
form_data=form_data)
return doc
def _get_level(self) -> str:
return LOW_LEVEL
def _search_forward(self, log: Log):
"""
"""
base = {
"index": ElasticConfig.event_log_index,
"doc_type": ElasticConfig.event_log_doc_type
}
# 开始向前查找
msearch_body = [base]
body_winreg = self._get_query(log, "winreg")
msearch_body.append(body_winreg)
msearch_body.append(base)
body_lsarpc = self._get_query(log, "lsarpc")
msearch_body.append(body_lsarpc)
results = self.es.multi_search(
body=msearch_body,
index=ElasticConfig.event_log_index,
doc_type=ElasticConfig.event_log_doc_type)
for each in results["responses"]:
if each.get("error"):
logger.error("PsLoggedOn module - multi search error: " +
each.get("error").get("reason"))
raise MsearchException()
elif each["hits"]["total"] == 0:
return False
return True
def _get_query(self, log: Log, relative_target_name):
computer_term = get_term_statement("computer_name",
log.dc_computer_name),
ago_time = move_n_min(utc_to_datetime(log.utc_log_time), 1)
time_str = datetime_to_utc(ago_time)
logon_id_term = get_term_statement("event_data.SubjectLogonId.keyword",
log.subject_info.logon_id)
share_name_term = get_term_statement("event_data.ShareName.keyword",
r"\\*\IPC$")
time_term = get_time_range("gt", time_str),
relative_term = get_term_statement(
"event_data.RelativeTargetName.keyword", relative_target_name)
query = {
"query":
get_must_statement(logon_id_term, share_name_term, relative_term,
time_term, computer_term),
"_source":
False,
"size":
1
}
return query
class UnknownAdminLogin(DetectBase):
def __init__(self):
super().__init__(code=ALERT_CODE, title=TITLE, desc=DESC_TEMPLATE)
self.account_info = AccountInfo()
def run(self, log: Log):
self.init(log=log)
sid = log.subject_info.user_sid
user_name = log.subject_info.user_name
domain_name = log.subject_info.domain_name
if domain_name.lower() == "window manager":
return
if not self._is_in_domain_list(domain_name):
return
if len(log.subject_info.user_sid.split("-")) == 4:
return
# 排除域控计算机账户的本地特权登录
if user_name.endswith("$"):
domain = get_netbios_domain(domain_name)
if user_name[:-1] in main_config.dc_name_list[domain]:
return
if self.account_info.check_target_is_admin_by_sid(sid=sid,
domain=domain_name):
return
return self._generate_alert_doc()
def _generate_alert_doc(self, **kwargs) -> dict:
source_ip = self._get_source_ip_by_logon_id(
self.log.subject_info.logon_id,
self.log.subject_info.full_user_name)
form_data = {
"source_workstation":
self._get_workstation_by_source_ip(source_ip),
"source_ip": source_ip,
"target_user_name": self.log.subject_info.user_name,
"target_user_sid": self.log.subject_info.user_sid,
"target_logon_id": self.log.subject_info.logon_id,
"target_domain": self.log.subject_info.domain_name,
"dc_hostname": self.log.dc_host_name,
**kwargs
}
doc = self._get_base_doc(level=self._get_level(),
unique_id=self._get_unique_id(
self.code,
self.log.subject_info.user_name),
form_data=form_data)
return doc
def _get_level(self) -> str:
return HIGH_LEVEL
def _is_in_domain_list(self, domain: str) -> bool:
"""
域名是否在已知需要监控的域列表中
"""
domain = get_netbios_domain(domain)
for each in main_config.domain_list:
if domain == get_netbios_domain(each):
return True
return False
class EnumerateGroup(DetectBase):
def __init__(self):
super().__init__(code=ALERT_CODE, title=TITLE, desc=DESC_TEMPLATE)
self.account_info = AccountInfo()
def run(self, log: Log):
self.init(log=log)
if log.object_info.server != "Security Account Manager":
return
if log.object_info.type != "SAM_GROUP":
return
sid = log.object_info.name
if not sid.startswith("S-1-5-21-"):
return
user_name = log.subject_info.user_name
if user_name.endswith("$"):
return
# 如果账号是管理员 直接忽略
if self.account_info.check_target_is_admin_by_sid(
sid=sid, domain=log.subject_info.domain_name):
return
# 判断账号是否为 Users，如果不是，直接退出
if not self.account_info.check_target_is_user_by_name(
user_name, log.subject_info.domain_name):
return
group_name = self._get_group_name(sid, log.subject_info.domain_name)
if not group_name:
return
sensitive_groups = list(
map(lambda x: x["name"], main_config.sensitive_groups))
if group_name in sensitive_groups:
return self._generate_alert_doc(group_name=group_name)
def _get_group_name(self, sid, domain):
ldap = LDAPSearch(domain)
entry = ldap.search_by_sid(sid, attributes=["cn"])
if entry:
return str(entry["cn"])
def _generate_alert_doc(self, **kwargs) -> dict:
source_ip = self._get_source_ip_by_logon_id(
self.log.subject_info.logon_id,
self.log.subject_info.full_user_name)
form_data = {
"source_workstation":
self._get_workstation_by_source_ip(source_ip),
"source_ip": source_ip,
"source_user_name": self.log.subject_info.user_name,
"source_user_sid": self.log.subject_info.user_sid,
"source_logon_id": self.log.subject_info.logon_id,
"source_domain": self.log.subject_info.domain_name,
**kwargs
}
doc = self._get_base_doc(level=self._get_level(),
unique_id=self._get_unique_id(
self.code,
self.log.subject_info.user_name),
form_data=form_data)
return doc
def _get_level(self) -> str:
return LOW_LEVEL
class ACLModify(DetectBase):
def __init__(self):
super().__init__(code=ALERT_CODE, title=TITLE, desc=DESC_TEMPLATE)
self.parser = SDDLParser()
self.account_info = AccountInfo()
self.watch_object_class = [
"container", "domainDNS", "groupPolicyContainer"
]
def run(self, log: Log):
self.init(log=log)
if log.object_info.class_ not in self.watch_object_class:
return
if log.event_data["AttributeLDAPDisplayName"] != "nTSecurityDescriptor":
return
abnormal_ace_list = []
abnormal_users = []
content = self.parser.parse(log.event_data["AttributeValue"])
domain = log.subject_info.domain_name
for ace in content["dacl_ace_list"]:
trustee = ace["trustee"]
# 判断是否为SID，因为这种ACL几乎都是默认的用户，很少特殊指定用户
if trustee.startswith("S-1-5-21-"):
# 首先检查 该SID是否为某个用户？（Users），如果不是，则忽略掉
if not self.account_info.check_target_is_user_by_sid(
trustee, domain):
continue
# 获取用户信息
user = self.account_info.get_user_info_by_sid(sid=trustee,
domain=domain)
# 目标是否为管理员权限
if self.account_info.check_target_is_admin_by_sid(
trustee, domain):
continue
if user.user_name in abnormal_users:
continue
abnormal_users.append(user.user_name)
abnormal_ace = self._get_abnormal_ace(ace, domain)
abnormal_ace_list.append(abnormal_ace)
if len(abnormal_ace_list) > 0:
return self._generate_alert_doc(
object_class=log.object_info.class_,
abnormal_ace_list=abnormal_ace_list,
parsed_sddl=content,
abnormal_users=abnormal_users)
def _generate_alert_doc(self, **kwargs) -> dict:
source_ip = self._get_source_ip_by_logon_id(
self.log.subject_info.logon_id,
self.log.subject_info.full_user_name)
form_data = {
"source_workstation":
self._get_workstation_by_source_ip(source_ip),
"source_ip": source_ip,
"source_user_name": self.log.subject_info.user_name,
"source_user_sid": self.log.subject_info.user_sid,
"source_logon_id": self.log.subject_info.logon_id,
"source_domain": self.log.subject_info.domain_name,
"object_info": self.log.object_info.get_doc(),
**kwargs
}
doc = self._get_base_doc(level=self._get_level(),
unique_id=self._get_unique_id(
self.code,
self.log.subject_info.user_name),
form_data=form_data)
return doc
def _get_level(self) -> str:
return HIGH_LEVEL
def _get_abnormal_ace(self, ace, domain) -> dict:
trustee = ace["trustee"]
ace["user_name"] = "unknown"
user_info = self.account_info.get_user_info_by_sid(sid=trustee,
domain=domain)
if user_info:
ace["user_name"] = user_info.user_name
return copy.deepcopy(ace)
