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

Static analysis result for SHA-256 49ed0e7aed118c46…

MALICIOUS

Office (OLE) / .DOC

76.5 KB Created: 2020-04-23 12:26:24 Authoring application: Microsoft Excel
MD5: 228003634e57d37f08787be02c0b6c14 SHA-1: 0e71bb6f250012609c08adf74d1cec6587b6cc05 SHA-256: 49ed0e7aed118c46daed37f7d0eb62ab111cf6f9ab295b4b165ce82585539908
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, identified by heuristics as potentially malicious. ClamAV detection confirms it as 'Xls.Dropper.Agent-7755579-0', indicating a dropper functionality. The presence of encrypted macros and the specific ClamAV signature strongly suggest the file's purpose is to download and execute a secondary payload.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-7755579-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7755579-0
  • 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.
  • OLE metadata lists many Excel 4.0 macro sheets high OLE_XLM_DOCPROPS_MACROSHEET_INVENTORY
    Workbook contains a BIFF Excel 4.0 macro-sheet marker and its clear OLE DocumentSummaryInformation stream lists many MacroN sheet titles. This is a useful static signal when FILEPASS encryption prevents formula extraction from the workbook stream.
  • 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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