Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 305ee81de0da7004…

MALICIOUS

Office (OLE)

811.5 KB Created: 2020-07-06 14:05:22 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 56a27a78ec2988beb2d4a626b1fde869 SHA-1: a20b58f2e36d581cdc3c736976d38eaada316e8b SHA-256: 305ee81de0da700424527a0fda02a532483572130d473283753c2e4cbe7b83f5
120 Risk Score

Malware Insights

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

The file is identified as an encrypted Excel 4.0 macro sheet, a common technique for delivering malicious payloads. The ClamAV detection name 'Xls.Dropper.Agent-8803274-0' strongly suggests its function as a dropper. While no specific URLs or scripts were extracted, the presence of encrypted XLM macros indicates an attempt to execute arbitrary code, likely to download and run a secondary malicious component.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-8803274-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8803274-0
  • 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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