Office (OLE) / .XLSX malware analysis — malicious · e791a6dd13722795

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-07-13

MD5: d56669e169fd1aefe39f1d6a9efe249f SHA-1: 56860e6d70681fdba486814e01f948ca171cea1f SHA-256: e791a6dd13722795a4e72ef90522a4d3b4de4d9b3dbf9896286237c53a7645e1

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating it will execute automatically when the document is opened. The macro uses dangerous formula APIs like RUN, suggesting it downloads and executes a second-stage payload from the URL http://bqx12lnjk03rrdio.xyz/i. The 'SE_ENABLE_LURE' heuristic confirms the presence of a macro-enable lure.

Heuristics 4

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.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `3a08691eed72e5ed205a0b2d682f61d57bf1de10bae67e5c55da30ecdcba1b08`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	4335 bytes

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