Office (OLE) / .XLS malware analysis — malicious · 1405ebc5e00e6503

MALICIOUS

Office (OLE) / .XLS

151.5 KB Created: 2020-06-22 16:20:38 Authoring application: Microsoft Excel

MD5: 40cf356e1e5b9bd99de03f9e8262fcc2 SHA-1: 3765fd90428b66ee38677e7f268c6dd6f89b846e SHA-256: 1405ebc5e00e65032a7cd10835efcd85e2de5dd4c2f39f5b77c7c65bce77688e

80 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open macro. The document body prompts the user to 'Enable Editing' to continue, which is a common lure for macro-enabled malicious documents. The presence of an Auto_Open macro indicates an attempt to automatically execute code upon opening the file.

Heuristics 2

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.
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` `fc4b4901e91a4425321a192ce07058d3df202b0de83a05541be49e98097231b0`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	89216 bytes

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