Office (OLE) / .XLSX malware analysis — malicious · 6542814b4a60ad92

MALICIOUS

Office (OLE) / .XLSX

36.0 KB Created: 2020-11-27 11:44:18 Authoring application: Microsoft Excel

MD5: e832e976c250cc2fdd0f32d3b4a5f1b1 SHA-1: 79dd789deb51f9ca92beb9b46181662b9930d78b SHA-256: 6542814b4a60ad923f8743448dc75d3425ec4db215730d652ae5a8d957cde713

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The macros utilize dangerous formula APIs, including a RUN function, suggesting an intent to execute arbitrary commands. While no specific URL or payload was extracted, the presence of Auto_Open with dangerous functions strongly implies a malicious intent to execute code.

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` `383e807addb2344d6bd38b22dc95bfbbacd636d0f9f602eb29383cf47725ebb8`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6644 bytes

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