Office (OLE) / .XLSX malware analysis — malicious · 451eda500b660029

MALICIOUS

Office (OLE) / .XLSX

36.5 KB Created: 2020-11-27 11:38:48 Authoring application: Microsoft Excel

MD5: 86bae9552293530f87445a6ac7e9925c SHA-1: e9bd27988b36aa08201f7b3fd2ab2a69474f5395 SHA-256: 451eda500b660029553af61402bc33b46bef8abade9cb80d62da9769a6cd21c8

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a known technique for executing arbitrary code. The heuristics indicate the use of dangerous formula APIs like RUN, suggesting the macro is designed to execute commands. No specific URLs or hashes were extracted, but the presence of the Auto_Open macro 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` `79089ed92c7c4505ba7e4481045604207b8641f564ad8b14cbeca34ecde06b2f`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6938 bytes

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