Office (OLE) / .XLSX malware analysis — malicious · 60fae2d4b70a23bb

MALICIOUS

Office (OLE) / .XLSX

36.0 KB Created: 2020-11-27 11:42:52 Authoring application: Microsoft Excel

MD5: 5a0d8334d592b2943c79b377b6ed5594 SHA-1: 2c44b0358ce685192cceae9484e60f71dd58cfaf SHA-256: 60fae2d4b70a23bbf011749fd39881c2b61073b469e3d3b17ff7fd077364a421

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. The presence of dangerous formula APIs like 'RUN' suggests the macro is designed to execute arbitrary commands or download further payloads. No specific URLs or hashes were extracted, but the Auto_Open functionality is a strong indicator of 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.
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` `676211739f16b859f70bbbd9436bce0e9207fafb2b9e01bb0ca9d83a06f6b887`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6754 bytes

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