Куда я попал?
SECURITM это SGRC система, ? автоматизирующая процессы в службах информационной безопасности. SECURITM помогает построить и управлять ИСПДн, КИИ, ГИС, СМИБ/СУИБ, банковскими системами защиты.
А еще SECURITM это место для обмена опытом и наработками для служб безопасности.

Boot or Logon Autostart Execution:  Print Processors

Adversaries may abuse print processors to run malicious DLLs during system boot for persistence and/or privilege escalation. Print processors are DLLs that are loaded by the print spooler service, spoolsv.exe, during boot. Adversaries may abuse the print spooler service by adding print processors that load malicious DLLs at startup. A print processor can be installed through the AddPrintProcessor API call with an account that has SeLoadDriverPrivilege enabled. Alternatively, a print processor can be registered to the print spooler service by adding the HKLM\SYSTEM\\[CurrentControlSet or ControlSet001]\Control\Print\Environments\\[Windows architecture: e.g., Windows x64]\Print Processors\\[user defined]\Driver Registry key that points to the DLL. For the print processor to be correctly installed, it must be located in the system print-processor directory that can be found with the GetPrintProcessorDirectory API call.(Citation: Microsoft AddPrintProcessor May 2018) After the print processors are installed, the print spooler service, which starts during boot, must be restarted in order for them to run.(Citation: ESET PipeMon May 2020) The print spooler service runs under SYSTEM level permissions, therefore print processors installed by an adversary may run under elevated privileges.

ID: T1547.012
Sub-technique of:  T1547
Tactic(s): Persistence, Privilege Escalation
Platforms: Windows
Permissions Required: Administrator, SYSTEM
Data Sources: Driver: Driver Load, File: File Creation, Module: Module Load, Process: OS API Execution, Windows Registry: Windows Registry Key Modification
Version: 1.0
Created: 05 Oct 2020
Last Modified: 09 Oct 2020

Procedure Examples

Name Description
Gelsemium

Gelsemium can drop itself in C:\Windows\System32\spool\prtprocs\x64\winprint.dll to be loaded automatically by the spoolsv Windows service.(Citation: ESET Gelsemium June 2021)

Earth Lusca

Earth Lusca has added the Registry key `HKLM\SYSTEM\ControlSet001\Control\Print\Environments\Windows x64\Print Processors\UDPrint” /v Driver /d “spool.dll /f` to load malware as a Print Processor.(Citation: TrendMicro EarthLusca 2022)

PipeMon

The PipeMon installer has modified the Registry key HKLM\SYSTEM\CurrentControlSet\Control\Print\Environments\Windows x64\Print Processors to install PipeMon as a Print Processor.(Citation: ESET PipeMon May 2020)

Mitigations

Mitigation Description
User Account Management

Manage the creation, modification, use, and permissions associated to user accounts.

Detection

Monitor process API calls to AddPrintProcessor and GetPrintProcessorDirectory. New print processor DLLs are written to the print processor directory. Also monitor Registry writes to HKLM\SYSTEM\ControlSet001\Control\Print\Environments\\[Windows architecture]\Print Processors\\[user defined]\\Driver or HKLM\SYSTEM\CurrentControlSet\Control\Print\Environments\\[Windows architecture]\Print Processors\\[user defined]\Driver as they pertain to print processor installations. Monitor for abnormal DLLs that are loaded by spoolsv.exe. Print processors that do not correlate with known good software or patching may be suspicious.

Каталоги

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