Office (OLE) / .XLSX malware analysis — malicious · 94b78e53fcc74fc3

MALICIOUS

Office (OLE) / .XLSX

35.5 KB Created: 2020-11-25 10:39:08 Authoring application: Microsoft Excel

MD5: 2c50fc2d7d188f6b6abefed53bbfc7c1 SHA-1: 60cfa526f4846340c804de802958db8aa1c9c100 SHA-256: 94b78e53fcc74fc341839203605821f4fbec248807d4871aaa79d5a167aeeb00

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains Excel 4.0 macro sheets, specifically triggering critical heuristics for an Auto_Open defined name and the use of dangerous formula APIs like RUN. This indicates the macro is designed to execute commands automatically upon opening the spreadsheet. The presence of the Auto_Open entry strongly suggests an intent to run arbitrary code, likely to download and execute a second-stage payload.

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` `4cd4331227b79ac6a01d3575a2852a432088bcc8aae08d4e37ae5456f732b6bb`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6356 bytes

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