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

Static analysis result for SHA-256 4892b155338d5d9b…

MALICIOUS

Office (OLE) / .XLS

830.5 KB Created: 2020-06-10 13:18:35 Authoring application: Microsoft Excel
MD5: fc41ee3ea143d46fc4f2fcc24b671375 SHA-1: ffd67d3bd021969b14352466f66006617f5a9dd3 SHA-256: 4892b155338d5d9b318485bbaddf4147e7c4f9c4de4e0b32dd5ac1f201ef7a7c
120 Risk Score

Malware Insights

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

The file is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of OLE_XLM_AUTOOPEN suggests it's designed to execute automatically. ClamAV detection as 'Xls.Dropper.Agent-8344996-0' confirms its malicious nature as a dropper. The document body is unreadable, but the heuristics and detection name strongly suggest a macro-based delivery mechanism for a secondary payload.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-8344996-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8344996-0
  • 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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