Office (OLE) malware analysis — malicious · be63fc8831f99a04

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:55 Authoring application: Microsoft Excel

MD5: 4fc3b53b6847285354a3772a4860b2f0 SHA-1: cee6f3cb9f7f1f4a3ef5fbe458e12dea4377c75e SHA-256: be63fc8831f99a0412997cfbea77f321188f7ad554b65f2af7d194c0bb129f25

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

This Excel file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. The macro sheet likely serves to download and execute a second-stage payload, although the specific URL or payload is not directly extractable from the provided evidence.

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.
XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN

Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `538ab74cdb9735f93f8e41cc888e796ca90f1db5720ef2ace7e5a2ea43e1a7ee`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6895 bytes

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