Office (OLE) / .XLS malware analysis — malicious · beb533bcb1183e70

MALICIOUS

Office (OLE) / .XLS

36.0 KB Created: 2021-02-16 09:52:24 Authoring application: Microsoft Excel

MD5: 6d841714e584704420fca8e0e5828dcb SHA-1: 01470d70122cccd39e653c7f17b8b187e4bab60b SHA-256: beb533bcb1183e7077a67d0e5792ae5e21353d5315d2e1d0ac95f290590d28dc

80 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 (XLM) macros, specifically an Auto_Open macro. The macro code is heavily obfuscated but appears to be designed to execute arbitrary code. The presence of the Auto_Open macro indicates an attempt to automatically run malicious code upon opening the document. The macro references specific cells and sheets within the workbook, suggesting it manipulates or retrieves data from these locations to achieve its objective.

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` `37e8cef84d7a34224b591ad84c00012486c3e40a4a51dc0d628c82e5d6872d1e`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	16704 bytes

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