Office (OLE) / .XLSX malware analysis — malicious · 608a69173802a158

MALICIOUS

Office (OLE) / .XLSX

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

MD5: e9d64bbf8b9bcc7367780b6f727d67a8 SHA-1: 94b99ac9241a338f489a2f97d2fd819a8a751cf4 SHA-256: 608a69173802a158358215938cea3c21d6c852c52c4c2a9bc80b833fb8659dcc

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains Excel 4.0 macros, including an Auto_Open entry, which is a strong indicator of malicious intent. The 'Macro/content-enable lure' heuristic confirms the document attempts to bypass security measures. The extracted URL is likely used to download a second-stage payload, as suggested by the macro's functionality.

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` `c2dc2d27a90e87fdcc044c59aed45fe776e1b180d63fa23ffc4ef09a815d1305`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	4016 bytes

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