Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1b00af2004500901…

MALICIOUS

Office (OLE)

67.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 89bd424fdc7162dd5dd90e0fb6193a39 SHA-1: 36a5d8c33214d9944c8c28edb38c45df0e741e8d SHA-256: 1b00af2004500901fa8236aa478ce3ef5b46bf715433d72d09a12b4f1d81fab2
120 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet, identified as malicious by ClamAV with the signature Xls.Dropper.Agent-9371034-0. The presence of encrypted and auto-open macros indicates it is designed to execute automatically upon opening. This type of file commonly acts as a downloader for further malicious payloads, hence the classification as a dropper.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-9371034-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9371034-0
  • 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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