Office (OLE) / .XLSX malware analysis — malicious · d0c51dd40563cbb4

MALICIOUS

Office (OLE) / .XLSX

143.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-05-31

MD5: cb9d4520969ced4f5564fc243aaa0998 SHA-1: 9f09661cba986c1d4505168baf508301053ef877 SHA-256: d0c51dd40563cbb496124ea6cb2535359195474ba2ba8166c6d05d08098b4f8f

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.005 PowerShell

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating it will execute automatically when the workbook is opened. The document body and heuristics suggest a lure impersonating DocuSign to trick the user into enabling macros. The XLM macros likely contain logic to download and execute a second-stage payload from one of the provided URLs.

Heuristics 4

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
Document signing service impersonation lure medium SE_DOCUSIGN_LURE

Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `c06303a4d2d9f3242c9a0e11a903b4059f80ff43a79c026b8de7cea5292556c9`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	2730 bytes

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