Try in Splunk Security Cloud

Description

The following analytic detects the loading of DLL modules associated with the GraphicalProton backdoor implant, commonly used by SVR in targeted attacks. It leverages Sysmon EventCode 7 to identify specific DLLs loaded by processes. This activity is significant as it may indicate the presence of a sophisticated backdoor, warranting immediate investigation. If confirmed malicious, the attacker could gain persistent access to the compromised host, potentially leading to further exploitation and data exfiltration.

  • Type: Anomaly

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2024-05-11
  • Author: Teoderick Contreras, Splunk
  • ID: bf471c94-0324-4b19-a113-d02749b969bc

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1574.002 DLL Side-Loading Persistence, Privilege Escalation, Defense Evasion
T1574 Hijack Execution Flow Persistence, Privilege Escalation, Defense Evasion
Kill Chain Phase
  • Installation
  • Exploitation
NIST
  • DE.AE
CIS20
  • CIS 10
CVE 


1
2
3
4
5



`sysmon` EventCode=7 ImageLoaded IN ("*\\AclNumsInvertHost.dll", "*\\ModeBitmapNumericAnimate.dll", "*\\UnregisterAncestorAppendAuto.dll", "*\\DeregisterSeekUsers.dll", "*\\ScrollbarHandleGet.dll", "*\\PerformanceCaptionApi.dll", "*\\WowIcmpRemoveReg.dll", "*\\BlendMonitorStringBuild.dll", "*\\HandleFrequencyAll.dll", "*\\HardSwapColor.dll", "*\\LengthInMemoryActivate.dll", "*\\ParametersNamesPopup.dll", "*\\ModeFolderSignMove.dll", "*\\ChildPaletteConnected.dll", "*\\AddressResourcesSpec.dll") 
| stats count min(_time) as firstTime max(_time) as lastTime by Image ImageLoaded process_name dest EventCode Signed ProcessId Hashes IMPHASH 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `windows_known_graphicalproton_loaded_modules_filter`

Macros

The SPL above uses the following Macros:

:information_source: windows_known_graphicalproton_loaded_modules_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • _time
  • Image
  • ImageLoaded
  • process_name
  • dest
  • EventCode
  • Signed
  • ProcessId
  • Hashes
  • IMPHASH

How To Implement

To successfully implement this search, you need to be ingesting logs with the process name and imageloaded executions from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.

Known False Positives

unknown

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
36.0 60 60 Windows Known GraphicalProton backdoor Loaded Modules on $dest$.

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 2