Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 eab5cdf92c96af51…

MALICIOUS

Office (OLE)

43.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 9608330f3c40f4c4d5cb187147203b1c SHA-1: 81649c188cccdc58250bc7e1041542e1a5eca7d7 SHA-256: eab5cdf92c96af51beac9bd747fd44dcd652a77b370a0eee68f6e5cf805be4b6
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The file is an Excel 4.0 macro sheet that contains an Auto_Open entry. This entry is configured to execute dangerous formula APIs, specifically the RUN function. This indicates the macro is designed to run an external command or program, likely to download and execute a second-stage payload. The presence of the RUN function is a critical indicator of malicious intent.

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
74125f9f49ecfd7704c2964935d04c680126008778a958c2d95c831de1fd4a97		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8964 bytes

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