Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7866226257cf5669…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:47:18 Authoring application: Microsoft Excel
MD5: 3a2a493445f99b7dcaca0d0e7c0d9291 SHA-1: 1ff1f21f7dc4a01d9796687b405782e766c587bb SHA-256: 7866226257cf566903342b2bf987e8a3f0f6f9c0c7c5951b4feaf74e5821e042
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 defined name, which is a critical finding. The presence of dangerous formula APIs like RUN indicates the macro is designed to execute arbitrary code. While the exact payload is not visible, the Auto_Open macro is a common technique for initial execution of malware.

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
07aa59d27fe5e5a5eacd4ed6f103647046ff18010d3892373beeadb54f8ca103		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6433 bytes

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