Windows ImageLoad of SVR GraphicalProton DLL Names

Flags Windows DLL loads matching known GraphicalProton/SVR DLL filename suffixes.

FreeReviewedSigma · Medium · v5

Product: windows
Category: image_load
Author: CISA (SigmaHQ), DRL 1.1
Published: 2023-12-18
Updated: 2026-07-31

ATT&CK techniques

Execution → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
- T1574.001DLL
Persistence
- T1574.001DLL
Priv Esc
- T1574.001DLL
Defense Evasion
- T1574.001DLL
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule identifies process image loads where the loaded DLL filename ends with one of several known SVR GraphicalProton-specific DLL names. Attackers commonly rely on DLL loading to execute or persist malicious functionality while blending into normal Windows activity. Detection depends on Windows image load telemetry that records the full loaded module path and allows matching the DLL name suffixes.

Reporting behind it

Related detections9 linkedT1574.001 — drag to rearrange

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Malicious dal_keepalives.dll Sideloaded By Signed Binary (via image_load)

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Windows ImageLoad of SVR GraphicalProton DLL Names

Pivot detection · T1574.001 · 9 related

Changelog

v5
Candidate ingested via manual entry.2026-07-31
v4
Candidate ingested via manual entry.2026-07-31
v3
Candidate ingested via manual entry.2026-07-31
v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

windows-imageload-of-svr-graphicalproton-backdoor-dll-names-e64c8ef3

title: Windows ImageLoad of SVR GraphicalProton DLL Names
id: 5a892d2a-8511-4066-8963-af05f6bd4c42
status: test
description: This rule identifies process image loads where the loaded DLL filename ends with one of several known SVR GraphicalProton-specific DLL names. Attackers commonly rely on DLL loading to execute or persist malicious functionality while blending into normal Windows activity. Detection depends on Windows image load telemetry that records the full loaded module path and allows matching the DLL name suffixes.
references:
  - https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-347a
  - https://github.com/SigmaHQ/sigma/blob/master/rules-emerging-threats/2023/TA/Cozy-Bear/image_load_apt_cozy_bear_graphical_proton_dlls.yml
author: CISA, Huntrule Team
date: 2023-12-18
tags:
  - attack.persistence
  - attack.privilege-escalation
  - attack.execution
  - attack.stealth
  - attack.t1574.001
  - detection.emerging-threats
logsource:
  category: image_load
  product: windows
detection:
  selection:
    ImageLoaded|endswith:
      - \AclNumsInvertHost.dll
      - \AddressResourcesSpec.dll
      - \BlendMonitorStringBuild.dll
      - \ChildPaletteConnected.dll
      - \DeregisterSeekUsers.dll
      - \HandleFrequencyAll.dll
      - \HardSwapColor.dll
      - \LengthInMemoryActivate.dll
      - \ModeBitmapNumericAnimate.dll
      - \ModeFolderSignMove.dll
      - \ParametersNamesPopup.dll
      - \PerformanceCaptionApi.dll
      - \ScrollbarHandleGet.dll
      - \UnregisterAncestorAppendAuto.dll
      - \WowIcmpRemoveReg.dll
  condition: selection
falsepositives:
  - Unknown
level: medium
license: DRL-1.1
related:
  - id: e64c8ef3-9f98-40c8-b71e-96110991cb4c
    type: derived

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