Office (OLE) / .XLSX malware analysis — malicious · 22bfb8023f27cb49

MALICIOUS

Office (OLE) / .XLSX

36.0 KB Created: 2021-02-22 11:13:18 Authoring application: Microsoft Excel

MD5: daf94b02109c469f64a887334e31c2ab SHA-1: ae3c27d787d7d7c79d7f2514b8269661cbdce7e8 SHA-256: 22bfb8023f27cb49ec0d9f9045c7659247d98c0ec070d04a7453be47c5d0afe3

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_AUTOOPEN_DEFINEDNAME heuristics. The SE_ENABLE_LURE heuristic suggests the document prompts the user to enable macros. The Auto_Open macro is configured to execute, and the presence of obfuscated strings within the document body suggests it is designed to download and execute a second-stage payload. No specific family could be identified.

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` `8847e65595c626d35906b142cea6944e027aec33b5d1fa51e1cac1bc80e5fd0a`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	16330 bytes

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