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

Static analysis result for SHA-256 5a87e09d250a00c2…

MALICIOUS

Office (OLE) / .XLSX

45.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 7111735a1ffec86ce0492398842b3d70 SHA-1: 6d5f8926257bb073b65aa6fbba9306c34a0c1a64 SHA-256: 5a87e09d250a00c2ba7b23f5a3b39bbc72d06683d5695f3ccf64aa9998decac9
160 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code. The macro is designed to prompt the user to enable content, a common lure. It also contains a URL that is likely used to download and execute a second-stage payload.

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.

FilenameKindSourceSize
xlm_macros.txt
781078a0073fbfd63e1249504738e6d2a29bb0afd6cb535eb41409a7694c5340		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3347 bytes

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