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

Static analysis result for SHA-256 3d5c6bf7bca7714b…

MALICIOUS

Office (OLE) / .XLS

289.5 KB Created: 2020-04-23 12:26:24 Authoring application: Microsoft Excel
MD5: bb97e12c80e1653bcd7a4b7faa6550b5 SHA-1: 59f7f9a2f06d61e0ea6b9b6f02b83f8205655faa SHA-256: 3d5c6bf7bca7714b1466c0a088a5dbe1a4684ec1d9142cb310d8c64688ce9fa4
120 Risk Score

Malware Insights

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

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro suggests it's designed to execute automatically upon opening. ClamAV detection as Xls.Dropper.Agent-8025492-0 further confirms its malicious nature as a dropper. No specific IOCs were extracted, but the file's structure points to a delivery mechanism for further malicious activity.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-8025492-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8025492-0
  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • 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.

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