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

Static analysis result for SHA-256 2a2caf9fb121bc09…

MALICIOUS

Office (OLE) / .XLS

603.5 KB Created: 2020-07-16 12:39:32 Authoring application: Microsoft Excel
MD5: 755cd9450296debdc5a135561fcf0ebf SHA-1: 7e64e00a9192093d9bb4a7aefd1886c4f64bc12f SHA-256: 2a2caf9fb121bc09e56f0564f4fe5c790bd9bb9a2982acba8aebf543f954043e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro that uses dangerous functions, specifically the RUN function. The macro sheet contains a string that appears to be a URL, likely used to download and execute a second-stage payload. ClamAV also detected this file as a known dropper.

Heuristics 4

  • 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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • ClamAV: Xls.Dropper.Agent-8900947-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8900947-0
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
ea0e3b89a6a6987bc607119d9e592f09cd25cdc763b575cd03fd800c093fbead		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 22114 bytes

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