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

Static analysis result for SHA-256 a8e1abadd5d0b8d7…

MALICIOUS

Office (OLE) / .XLS

59.0 KB Created: 2020-04-22 04:43:55 Authoring application: Microsoft Excel
MD5: 876e20c3802f72b7f3a32eda007c2552 SHA-1: 4422141b9e4c00150e891e4b1635d45e5ab9400a SHA-256: a8e1abadd5d0b8d751e02a4b4fa376efcc2fe149542d950b85152649e5f7ae25
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. ClamAV detection confirms it as 'Xls.Dropper.Agent-7688246-0', suggesting it functions as a dropper. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) implies it executes automatically upon opening, likely to download and execute a secondary payload.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-7688246-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7688246-0
  • 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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