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

Static analysis result for SHA-256 838739951c7d6dcf…

MALICIOUS

Office (OLE) / .XLS

66.0 KB Created: 2020-05-29 03:02:40 Authoring application: Microsoft Excel
MD5: 6e624858abff231cee545a2ad3d65f9f SHA-1: 9e44b08bb784918e5df5a260d227d5d38cfc4ad8 SHA-256: 838739951c7d6dcfaaa438c3efabdf2b0d320e53a79f47de9033dfd9bdf50226
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 containing an Auto_Open function. This function is designed to execute a payload, likely by downloading and running a second-stage component from the obfuscated URL found in the document body. The ClamAV signature 'Xls.Dropper.Agent-7946674-0' further confirms its malicious nature as a 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-7946674-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7946674-0
  • 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
829fe987c3c13708b020c59db8f87d2b8d367b0d80da80154b235ee163505b3c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 43460 bytes

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