Lazarus Group Uses the DLL Side-Loading Technique (2)

2024-01-23 Ahnlab

https://asec.ahnlab.com/en/60792/

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AhnLab identified new Lazarus DLL side-loading variants that use the legitimate Microsoft wmiapsrv.exe module to load malicious wbemcomn.dll and netutils.dll files. The malicious DLLs act as backdoors, and wbemcomn.dll includes a target-verification routine that uses GetSystemFirmwareTable output to decrypt resource strings and load the next file only on specific systems. netutils.dll can load C:\ProgramData\Microsoft Editor\editor.dat without the same verification process, and the excerpt includes PDB information pointing to a loader development path. The behavior is mapped to DLL side-loading under T1574.002 and is presented as part of Lazarus activity against South Korean companies, institutions, think tanks, and related targets.

Indicators of Compromise

Type Value First Seen Last Seen
HASH 21def97a3c5b95df1e1aeb6486881656 2024-01-17 2024-01-23
HASH edca71eda8650a2c591c37c780b6a0c5 2024-01-17 2024-01-23

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