Office (OLE) / .XLS malware analysis — malicious · e3462d258f0247f1

MALICIOUS

Office (OLE) / .XLS

258.5 KB Created: 2020-09-14 21:28:14 Authoring application: Microsoft Excel

MD5: b9cb5b440d5d408e27c4685f50c5aa17 SHA-1: 19a2a767171cb7c6609f150e8c86456fa2bba9ec SHA-256: e3462d258f0247f1db6b618620f570208c9fafbfdf79aa51358ad140a4adbf84

80 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 (XLM) macros. The critical heuristic firing indicates the presence of an Auto_Open defined name, which is a common method for automatically executing malicious code when the workbook is opened. No specific URLs or further payloads were extracted, limiting the analysis of the exact execution chain.

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` `a86b7804f301bc680c360e9062e341b53b52b3d895569126ab519b2fcd2b2694`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	10975 bytes

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