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"
]
class ModifySensitiveGroup(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)
group_name = log.target_info.user_name
sensitive_groups = list(
map(lambda x: x["name"], main_config.sensitive_groups))
if group_name in sensitive_groups:
# 添加到了敏感组，更新redis缓存
self.account_info.set_target_sensitive_cache(
self.log.event_data["MemberSid"], "true")
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_ip": source_ip,
"source_workstation":
self._get_workstation_by_source_ip(source_ip),
"group_name": self.log.target_info.user_name,
"group_sid": self.log.event_data["TargetSid"],
"target_user_name":
get_cn_from_dn(self.log.event_data["MemberName"]),
"target_user_dn": self.log.event_data["MemberName"],
"target_user_sid": self.log.event_data["MemberSid"],
"target_domain": self.log.target_info.domain_name,
"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,
"privilege_list": self.log.event_data["PrivilegeList"]
}
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
class SPNChange(object):
def __init__(self):
self.account_info = AccountInfo()
self.account_activity = AccountActivity(activity_type=SPN_CHANGE)
def run(self, log: Log):
if log.event_data["AttributeLDAPDisplayName"] != "servicePrincipalName":
return
if log.event_data["ObjectClass"] != "user":
return
if log.event_data["OperatorType"] not in ["%%14675", "%%14674"]:
return
domain = log.event_data["DSName"]
target_user_name = get_cn_from_dn(log.object_info.dn)
target_user_info = self.account_info.get_user_info_by_name(
target_user_name, domain)
form_data = {
"operator": {
"user_name": log.subject_info.user_name,
"sid": log.subject_info.user_sid,
"logon_id": log.subject_info.logon_id
},
"operator_type":
"add" if log.event_data["OperatorType"] == "%%14674" else "remove",
"value":
log.event_data["AttributeValue"],
"object_dn":
log.object_info.dn
}
self.account_activity.save_activity(domain=log.event_data["DSName"],
user_name=target_user_name,
sid=target_user_info.user_sid,
dc_name=log.dc_host_name,
timestamp=log.utc_log_time,
data=form_data)
def __init__(self):
super().__init__(code=ALERT_CODE, title=TITLE, desc=DESC_TEMPLATE)
self.account_info = AccountInfo()
self.account_history = AccountHistory()
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 NTLMRelay(DetectBase):
def __init__(self):
super().__init__(code=ALERT_CODE, title=TITLE, desc=DESC_TEMPLATE)
self.account_history = AccountHistory()
self.account_info = AccountInfo()
self.es = ElasticHelper()
def run(self, log: Log):
self.init(log=log)
# 处于数据统计时间内，不检测
if datetime_now_obj() < main_config.learning_end_time:
return
if not log.source_info.ip_address:
return
if log.event_data["AuthenticationPackageName"] != "NTLM":
return
work_station = log.source_info.work_station_name
netbios_name = get_netbios_domain(log.target_info.domain_name)
if filter_domain(netbios_name):
return
# 为较小误报 目前只考虑来源主机为敏感主机的行为
if not self.account_info.computer_is_sensitive_by_name(
work_station, domain=netbios_name):
return
ip_address = log.source_info.ip_address
if ip_filter(ip_address):
return
# 根据主机名去查最近的认证IP
last_ip = self.account_history.search_last_ip_by_workstation(
work_station)
if not last_ip or last_ip == "unknown" or last_ip == ip_address:
return
# 二次确认，如果上次认证IP与当前IP不相同，则对主机名进行解析，判断IP是否相等
resolver_ips = self._get_host_ip(log)
if ip_address in resolver_ips:
return
if "V1" in log.event_data["LmPackageName"]:
version = "v1"
else:
version = "v2"
relay_workstation = self.account_history.get_last_workstation_by_ip(
ip_address)
return self._generate_alert_doc(relay_workstation=relay_workstation,
ntlm_version=version,
resolver_ips=resolver_ips,
last_ip=last_ip)
def _generate_alert_doc(self, **kwargs) -> dict:
form_data = {
"source_ip": self.log.source_info.ip_address,
"relay_ip": self.log.source_info.ip_address,
"source_workstation": self.log.source_info.work_station_name,
"target_user_name": self.log.target_info.user_name,
"target_domain": self.log.target_info.domain_name,
"target_user_sid": self.log.target_info.user_sid,
"target_logon_id": self.log.target_info.logon_id,
"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 HIGH_LEVEL
def _get_host_ip(self, log: Log) -> list:
"""
对主机名进行DNS解析
"""
dns_name = "{workstation}.{domain}".format(
workstation=log.source_info.work_station_name,
domain=self.get_FQDN_domain(log.target_info.domain_name))
try:
ip_list = get_ip_from_domain(dns_name)
except Exception as e:
return []
return ip_list
def get_FQDN_domain(self, domain) -> str:
for each in main_config.domain_list:
if each.startswith(domain.lower()):
return each
return ""
def __init__(self):
super().__init__(code=ALERT_CODE, title=TITLE, desc=DESC_TEMPLATE)
self.es = ElasticHelper()
self.account_info = AccountInfo()
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$")
time_term = get_time_range("gt", time_str),
relative_term = get_term_statement(
"event_data.RelativeTargetName.keyword", relative_target_name)
query = {
"query":
get_must_statement(logon_id_term, share_name_term, relative_term,
time_term, computer_term),
"_source":
False,
"size":
1
}
return query
def __init__(self):
self.account_info = AccountInfo()
self.account_activity = AccountActivity(activity_type=SPN_CHANGE)
class EnumerateGroup(DetectBase):
def __init__(self):
super().__init__(code=ALERT_CODE, title=TITLE, desc=DESC_TEMPLATE)
self.account_info = AccountInfo()
def run(self, log: Log):
self.init(log=log)
if log.object_info.server != "Security Account Manager":
return
if log.object_info.type != "SAM_GROUP":
return
sid = log.object_info.name
if not sid.startswith("S-1-5-21-"):
return
user_name = log.subject_info.user_name
if user_name.endswith("$"):
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
def __init__(self):
super().__init__(code=ALERT_CODE, title=TITLE, desc=DESC_TEMPLATE)
self.delegation = Delegation()
self.account_info = AccountInfo()
class ResBasedConsDelegation(DetectBase):
def __init__(self):
super().__init__(code=ALERT_CODE, title=TITLE, desc=DESC_TEMPLATE)
self.delegation = Delegation()
self.account_info = AccountInfo()
def run(self, log: Log):
self.init(log=log)
if log.event_data[
"AttributeLDAPDisplayName"] != "msDS-AllowedToActOnBehalfOfOtherIdentity":
return
# 只检测敏感计算机
account = get_cn_from_dn(log.object_info.dn)
domain = get_domain_from_dn(log.object_info.dn)
if not self.account_info.computer_is_sensitive_by_name(
account, domain=get_netbios_domain(domain)):
return
ldap = LDAPSearch(domain=domain)
entry = ldap.search_by_cn(
cn=account,
attributes=["sid", "msDS-AllowedToActOnBehalfOfOtherIdentity"])
if entry is None:
return
entry_sid = str(entry["sid"])
sd = SR_SECURITY_DESCRIPTOR(entry.entry_attributes_as_dict[
"msDS-AllowedToActOnBehalfOfOtherIdentity"][0])
# 拥有特殊DACL权限的SID列表
ace_list = []
for ace in sd["Dacl"].aces:
ace_list.append({
"type_name": ace["TypeName"],
"sid": ace['Ace']['Sid'].formatCanonical()
})
sid_list = list(map(lambda ace: ace["sid"], ace_list))
sid_list = sorted(list(set(sid_list)))
target_account_info = User({
"user_name": account,
"user_sid": entry_sid
})
# 查询历史委派记录
record = self.delegation.find_res_constrained_delegation_by_name(
name=account)
# 不存在记录 则新建 并直接告警
if not record:
self.delegation.new_delegation_record(
user=target_account_info,
delegation_type=RES_BASED_CONSTRAINED_DELEGATION,
allowed_to=sid_list)
return self._generate_alert_doc(
target_computer=account,
target_user_name=target_account_info.user_name,
target_user_sid=target_account_info.user_sid,
add_allowed_sid=sid_list,
old_allowed_sid=[])
# 存在记录且不变，退出
if sid_list == record["allowed_to"]:
return
# 存在记录 对比历史的sid 无新增 更新记录 退出
new_sids = self._get_new_sid(new_list=sid_list,
old_list=record["allowed_to"])
if len(new_sids) == 0:
self.delegation.update_delegation(
sid=entry_sid,
delegation_type=RES_BASED_CONSTRAINED_DELEGATION,
allowed_to=sid_list)
return
# 存在记录 有新增 更新记录 告警
if len(new_sids) > 0:
self.delegation.update_delegation(
sid=entry_sid,
delegation_type=RES_BASED_CONSTRAINED_DELEGATION,
allowed_to=sid_list)
return self._generate_alert_doc(
target_computer=account,
target_user_name=target_account_info.user_name,
target_user_sid=target_account_info.user_sid,
add_allowed_sid=new_sids,
old_allowed_sid=record["allowed_to"])
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_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 HIGH_LEVEL
def _get_new_sid(self, new_list, old_list) -> list:
result = []
for each in new_list:
if each not in old_list:
result.append(each)
return result
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 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)
class GPODelegation(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 not log.object_info.dn:
return
assert isinstance(log.object_info.dn, str)
# 组策略对象
if not log.object_info.dn.lower().startswith("cn=policies,cn=system,"):
return
if not log.object_info.class_ == "container":
return
value = log.event_data["AttributeValue"]
parser = SDDLParser()
value_obj = parser.parse(value)
domain = log.subject_info.domain_name
abnormal_ace_list = []
abnormal_users = []
for each in value_obj["dacl_ace_list"]:
trustee = each.get("trustee")
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
user = self.account_info.get_user_info_by_sid(trustee, domain)
abnormal_users.append(user.user_name)
abnormal_ace_list.append(each)
if len(abnormal_ace_list) > 0:
return self._generate_alert_doc(
abnormal_ace_list=abnormal_ace_list,
parsed_sddl=value_obj,
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_ip": source_ip,
"source_workstation":
self._get_workstation_by_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
