Office (OLE) / .XLS malware analysis — malicious · 0066bedc61e50e55

MALICIOUS

Office (OLE) / .XLS

62.5 KB Created: 2021-02-18 08:10:45 Authoring application: Microsoft Excel

MD5: 4b04c5b32d4b56290a8f9dfb95699189 SHA-1: accaf49f8b7f4c2de0b26464534e6bdd0a899d22 SHA-256: 0066bedc61e50e5508a4abc4906f1887c779374cb0f410a2ca7a99fcae728d01

80 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1566.002 Spearphishing with Other

The file is an Excel 4.0 macro-enabled spreadsheet that uses an Auto_Open macro to execute. The document body contains a lure to trick the user into enabling macros by presenting a fake error message and instructions. The presence of an Auto_Open macro and the social engineering lure are strong indicators of malicious intent, likely for initial access or payload delivery.

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` `4336366eee1e4320ebc2601c568e7122196b859ba678a118a851f2dd0731b8d1`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	39036 bytes

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