Office (OLE) / .XLSX malware analysis — malicious · 8fd5a1808c0b9c30

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 969b590482d33bb0ab65854af16c704b SHA-1: 53c9837cda6786c81f7a56b67c77372eff27d6f6 SHA-256: 8fd5a1808c0b9c30a00d5486caba9fbaf9b53b82467dc56ed5bc6134e6a5e78e

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The sample contains Excel 4.0 (XLM) macros, specifically an Auto_Open entry, which is designed to execute automatically when the document is opened. The document body displays a lure to enable macros, indicating a malicious intent to bypass security measures. The extracted URL is likely used to download a secondary payload.

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` `45a7345bc752304d48c793d0ba21805d53d544fcb5bb304c18335730192a5f67`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1962 bytes

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