Office (OLE) / .XLSX malware analysis — malicious · 61d5f15684fc6716

MALICIOUS

Office (OLE) / .XLSX

36.5 KB Created: 2020-11-27 11:41:52 Authoring application: Microsoft Excel

MD5: c30f76f74acde2e4a7779912e7216b1b SHA-1: b2a8d72bb4e56cd90dde73c138b06b2c43605c01 SHA-256: 61d5f15684fc6716b99b389ac09c102ab1feda734b1409abb2c1b846e3661390

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 finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands. The macro sheet likely serves to download and execute a second-stage payload, although the specific commands or URLs are 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` `2416617b3dfae219ab0551def8897bc8ebb0e71ed2972fde6bb5fb6516757ae1`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6896 bytes

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