Office (OLE) malware analysis — malicious · bef70bcbc286a385

MALICIOUS

Office (OLE)

90.5 KB Created: 2020-07-13 15:38:54 Authoring application: Microsoft Excel

MD5: b17ccc05ecd5abd4f5c3e14e3f64bccc SHA-1: 4eb87883748179b96125a90748f79bbbda09594f SHA-256: bef70bcbc286a38589cf1118b99451fff5f46b331f1b2d8ce9aed8a8d8679895

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel 4.0 macro sheet that contains an Auto_Open defined name, which is a critical heuristic firing. The macro sheet also uses dangerous formula APIs, specifically the RUN function, indicating it is designed to execute code. The reconstructed URL from the document body, 'http://sorbeingduq.cmlBvkFzxURLMONdwATaJCSExQYGkyIfHZVP', is likely the source of the payload. This indicates a macro-based execution attack pattern.

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` `79ebf0757562d1e83eb3472d300d129c116d934b1de308e1e2d28b8128a158ae`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	22745 bytes

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