Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f478fbc67c123cb0…

MALICIOUS

Office (OLE)

70.5 KB Created: 2020-04-15 05:50:52 Authoring application: Microsoft Excel
MD5: 7b858b89e41f1c0acd6498e3c42f4a53 SHA-1: ceddba5ec73e3095ea46f09a445a9330b1fac084 SHA-256: f478fbc67c123cb052f3d62ae3d94292aead2d3ec71707d443d91f08f9897212
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, flagged by ClamAV as Xls.Dropper.Agent-7669792-0. The presence of encrypted XLM macros indicates an attempt to hide malicious functionality. The primary purpose appears to be dropping a secondary payload, as suggested by the 'Dropper' designation in the ClamAV detection name.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-7669792-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7669792-0
  • 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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