Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c4aa6079264e240c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:56 Authoring application: Microsoft Excel
MD5: 014dd5f0915e69dd02f9eaef6e498c84 SHA-1: 82bc42ad40d6c81e7f6eae6fbed3721c130bb4a4 SHA-256: c4aa6079264e240cfc513e54b450f1a8fd371407e73679685606624a01b945e2
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 function, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. This points towards a downloader or initial execution stage for a more complex attack.

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
1e79820836bb3befbd0a27633045eeebeafd5d4127e656c6b76ee926cdba6603		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6736 bytes

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