Office (OLE) / .XLSX malware analysis — malicious · 35c6b2cb13b6cc6d

MALICIOUS

Office (OLE) / .XLSX

142.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-07-13

MD5: bce1c48bb5a77cea177d98a53a0e2560 SHA-1: 4cba7d9d49d85a8dc4bd9314e51c30ba3a416e8b SHA-256: 35c6b2cb13b6cc6d13d4618f58579046bdf5d901968a64ebb516cad0a2381b83

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The critical heuristic firing indicates the presence of an Excel 4.0 Auto_Open macro, a common technique for executing malicious code upon opening the document. The 'SE_ENABLE_LURE' heuristic further suggests the document prompts the user to enable macros. While no specific URLs or payloads were extracted, the presence of the Auto_Open macro strongly implies a downloader or initial execution stage for further malicious activity.

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` `e7454a896389a509b0895ec41c70df8826ced9fbb5099918da85a1b3e08833ad`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	494 bytes

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