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Archived: 2026-04-05 20:41:59 UTC
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 Tool: PRIVATELOG
Names PRIVATELOG
Category Malware
Type Loader
Description
(Cybereason) PRIVATELOG is a module that exists in 2 forms:
• Wlbsctrl.dll: A DLL to be side-loaded by the IKEEXT service, aiming to execute on
Windows Vista to Windows 7 operating systems.
• Prntvpt.dll: A DLL to be side loaded by the PrintNotify service, aiming to execute on
Windows Server 2012 to Windows 10 operating systems.
As both of the DLLs are being loaded by native Windows services, they both live in the
context of the svchost process, but differ in their execution flow.
Information
<https://www.cybereason.com/blog/operation-cuckoobees-a-winnti-malware-arsenal-deep-dive>
<https://www.mandiant.com/resources/unknown-actor-using-clfs-log-files-for-stealth>
Malpedia <https://malpedia.caad.fkie.fraunhofer.de/details/win.privatelog>
Last change to this tool card: 27 December 2022
Download this tool card in JSON format
All groups using tool PRIVATELOG
Changed Name Country Observed
APT groups
  APT 41 2012-Jul 2025
1 group listed (1 APT, 0 other, 0 unknown)
https://apt.etda.or.th/cgi-bin/listgroups.cgi?u=3f25cda3-f293-4a3a-9b3a-7cdef172f7d9
Page 1 of 2

Source: https://apt.etda.or.th/cgi-bin/listgroups.cgi?u=3f25cda3-f293-4a3a-9b3a-7cdef172f7d9
https://apt.etda.or.th/cgi-bin/listgroups.cgi?u=3f25cda3-f293-4a3a-9b3a-7cdef172f7d9
Page 2 of 2

APT groups  APT 41 2012-Jul 2025 
1 group listed (1 APT, 0 other, 0 unknown) 
   Page 1 of 2