Office (OLE) / .XLS malware analysis — malicious · 409c0fdd23e87d21

MALICIOUS

Office (OLE) / .XLS

58.0 KB Created: 2021-03-01 10:19:28 Authoring application: Microsoft Excel

MD5: b5487815da8e8e15cfa3d2946f4b7132 SHA-1: 3278e15e1761100b6e9bb98b2351594aebd3805d SHA-256: 409c0fdd23e87d2181aed6a283d83cdeaa1b7fbb685df01b5358febb0d09c8b8

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The document body contains obfuscated strings and commands that suggest the macro is designed to download and execute a second-stage payload, a typical behavior for macro-based malware droppers.

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` `3dd4b02c93d9e467c59fb62304f8215116b9809ec55f8d1ddc1eace949325258`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	53122 bytes

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