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

Static analysis result for SHA-256 7cd4af319e60d6ea…

MALICIOUS

Office (OLE) / .XLS

65.0 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel
MD5: a4c1596a9086d0afb5c2f6c7b9b049e2 SHA-1: 692107c88e59f9a769e78327a1c468edf32f6fc3 SHA-256: 7cd4af319e60d6eab8020387325fa30f32dc8e5aa8470979fda1250e560d8c89
100 Risk Score

Malware Insights

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

The sample is an Excel 4.0 spreadsheet containing an Auto_Open macro. The document body presents a lure to enable editing and content, which is a common tactic for macro-based malware. The extracted macro defines a string that, when executed, constructs and runs a command to download a payload from the URL "http://0xc12a24f5/c.html" or "http://0xc12a24f5/cc.html". This indicates the file functions as a downloader for a second-stage 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
0807f652a36752efcd354ce3c536f2fe7ed4cd53a3ff1787c33acb378dda90a0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1073 bytes

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