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

Static analysis result for SHA-256 d41c2bbd05c001f5…

MALICIOUS

Office (OLE) / .XLSX

378.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-07-13
MD5: 9e4f66b349c12f63def6cd2e17ce2c64 SHA-1: 5380d01e1c9beaa45badacb1123bce018de3e970 SHA-256: d41c2bbd05c001f5c51d92ab87b4a99dacf238f0bf76a9afa06e5c065451af15
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1204.002 Malicious File Execution: Malicious Macro

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open defined name, which is a strong indicator of malicious intent. The presence of a 'Macro/content-enable lure' heuristic further suggests the document is designed to prompt the user to enable macros. The embedded URL 'http://rmdwk19obfzrq03ohby.xyz/apple.gif' is likely used to download a secondary 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.
  • 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
855e443b676f37217d33677a9c6a10a49b0648d00e8aa00f6d93fbdd2229abce		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4016 bytes

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