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

Static analysis result for SHA-256 0c6c75fc91840044…

MALICIOUS

Office (OLE) / .XLS

65.3 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel
MD5: 614859b7681482cccec127178dc306d4 SHA-1: 2c324a1519bac61d9e2563b98be3e9c9d46be1fc SHA-256: 0c6c75fc91840044c22025c2474e2b8be7f4da90dfaa01e65e7e4e97398953a0
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 document body explicitly instructs the user to "Enable Editing" and "Enable Content" to view the content, which is a common lure. The extracted XLM macro defines a string that is executed via cmd.exe, which in turn attempts to download a payload from the URL "http://0xc12a24f5/cc.html". This indicates a macro-based downloader attack.

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.