Office (OLE) / .XLSX malware analysis — malicious · 0cf2fd402588449c

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 1c6baa7713eaab2a19ec45df63f7ed75 SHA-1: f26c08b3b799c5c38c42f85096ede23938821730 SHA-256: 0cf2fd402588449c9ae1918f504e011256c41b2849079fdf5b72a3c11e5b9e51

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating automatic execution upon opening. It also employs a lure to trick the user into enabling macros by impersonating a DocuSign signing request. The embedded URLs are likely used to download a secondary payload.

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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