Office (OLE) / .XLSX malware analysis — malicious · 86168e7ab0c19531

MALICIOUS

Office (OLE) / .XLSX

138.5 KB Created: 2012-12-09 09:08:59 Authoring application: Microsoft Excel

MD5: ce872c716973f2e6ade5066ffab2b92f SHA-1: 07df471a92697cb909db14eb385c1ba79eedf980 SHA-256: 86168e7ab0c195312d6efb5146fe8397e0c7daf65bb530ee68209f23a2cfaf62

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.001 PowerShell T1566.001 Spearphishing Attachment

The file is an Excel 4.0 macro sheet containing an Auto_Open macro, which is a known technique for executing malicious code upon opening. The document body contains a lure to 'Enable Editing' and 'Enable Content', typical for macro-enabled malicious documents. The presence of dangerous formula APIs in the Auto_Open macro further indicates malicious intent, likely to download and execute a second-stage payload.

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.

Filename	Kind	Source	Size
`xlm_macros.txt` `e6b88ce617d9bc92dfbc42e61ab5462edf5277eb26544ad59e0af7c723a77d4e`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	80805 bytes

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