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

Static analysis result for SHA-256 032c02e96471a173…

MALICIOUS

Office (OLE) / .XLS

64.8 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel
MD5: 5591572b8c59ccc8db42bc1b1b2797bc SHA-1: e519736f1fcd55b959ce471cf427de11b842a939 SHA-256: 032c02e96471a173df5f54ee88d6a0c3a8d5f9d2af35ae108308950e8fd78150
100 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook that uses an 'Enable Editing' and 'Enable Content' lure to trick the user into running malicious code. The Auto_Open macro executes a command to download a second-stage payload from the URL http://0xc12a24f5/c.html. The macro also defines a name 'lll' which contains a similar URL, http://0xc12a24f5/cc.html, likely for a similar purpose.

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

Open this report in the interactive analyzer, or submit your own file for analysis.