Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0e7dcaa2a0b1d037…

MALICIOUS

Office (OLE)

911.5 KB Created: 2020-07-07 10:47:28 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 5d3da35b75a8ebd4ea01e5dfea3cc964 SHA-1: a96ad70d56e1fb611b6ecc29029b813b9d3948ff SHA-256: 0e7dcaa2a0b1d03753b49f7fd799a82c9c0ee20b6d1b02496151f53e234ddd91
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is identified as malicious by ClamAV and exhibits characteristics of an Excel 4.0 dropper. The presence of encrypted and auto-open macros strongly suggests that the file is designed to execute arbitrary code upon opening. The primary function appears to be the execution of a second-stage payload, though the specific details of this payload are not discernible from the provided evidence.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-8964037-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8964037-0
  • 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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