Office (OLE) / .XLSX malware analysis — malicious · 97c2fc00a541b58b

MALICIOUS

Office (OLE) / .XLSX

36.5 KB Created: 2020-11-25 10:43:37 Authoring application: Microsoft Excel

MD5: 3ec93d087478d260e1f641ccc7769b4c SHA-1: 89250ccb308ff998ca39df2b01218d1c985140ab SHA-256: 97c2fc00a541b58b70b762a49381efd6824ed3d43494742582cf2fccdeb16b66

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding. This indicates the macro will execute automatically upon opening the document. The presence of the 'RUN' function within the macro sheet is a strong indicator of malicious intent, likely to execute arbitrary commands or download further payloads. No specific family could be identified, but the technique is common for initial access.

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` `2410d8366209cf9586c7baed0adcf68566eef6b08b0b18a97256699d3d0fb12a`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6611 bytes

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