Office (OLE) / .XLS malware analysis — malicious · d476bfb39fca0cdf

MALICIOUS

Office (OLE) / .XLS

41.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: d4cc94fb793af31b60ef9b56afcb181b SHA-1: a1eb44c0f4f1d401c9e08f1d354db802030ef37f SHA-256: d476bfb39fca0cdf08f45262b1d2ec7f264fff5c276bdd55ddb9df4ea60ccedd

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Service Execution: Service Control T1059.001 PowerShell T1059 Command and Scripting Interpreter

The file is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute arbitrary commands upon opening. No specific URLs or hashes were extracted, but the presence of the RUN function is a strong indicator of malicious intent for payload execution.

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` `6dd6586c40cbf624d83b2ea3894e440db236cc7c8a824c55351c4a6074fe1447`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8014 bytes

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