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

Static analysis result for SHA-256 c93661fefcbd97fa…

MALICIOUS

Office (OLE) / .XLS

603.5 KB Created: 2020-07-16 12:39:32 Authoring application: Microsoft Excel
MD5: 5f1821143653b23f7064ba4e31561d3d SHA-1: b9f55a6a65057b85f199b520831bf9fb633381e1 SHA-256: c93661fefcbd97fa5d66aa7e6bb6d8274b84f29e7cdbcb95988fe2a04ce5fa0f
200 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled spreadsheet detected by ClamAV as Xls.Dropper.Agent. The presence of an Auto_Open macro and the use of the RUN function indicate that the macro sheet is designed to execute arbitrary commands. The reconstructed URL 'http://ebacq.omdlsizMJfxURLONwTFASEurgv\GkKyIBHUZQY' is likely used to download and execute a second-stage payload.

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-8940191-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8940191-0
  • 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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