Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 60e4b062f32f2656…

MALICIOUS

Office (OLE) / .XLSX

469.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 6be7ef0543c5d48c2ddfeff04dc47c2e SHA-1: de6293bb28adbee9d4fa81fb5621dada9062ce38 SHA-256: 60e4b062f32f2656896e29a030fb719c8f5103a5b4ff6a2de95e1df8fd39065a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open entry, which is a known technique for executing malicious code upon opening the workbook. The macro is configured to download and execute a payload from the URL http://starwmineiro.ch/casrtnoar/count.php. This indicates a macro-based downloader attack, likely delivered via spearphishing.

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.

FilenameKindSourceSize
xlm_macros.txt
877b24336da75137a3a99cda7752c4a2d3bef2725374cfe3b531d5b368960619		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 14228 bytes

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