Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 934710925fc13429…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:17 Authoring application: Microsoft Excel
MD5: 36cfa470abdf12d296106f995345d285 SHA-1: bddaef14c06a3da8e02584f647e63171c8c41cf0 SHA-256: 934710925fc13429fcef5e856e6efb7a5805e0eda355bf6e20e970e3b4de8874
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical finding. This indicates the file is designed to execute arbitrary code when opened. The presence of dangerous formula APIs like RUN further supports this. The macro's purpose is likely to download and execute a secondary payload, a common technique for malware delivery.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
373a6ae4f71a026af709b74eae73508c72be3f8e3457fd0e6830779ed9060286		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6494 bytes

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