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

Static analysis result for SHA-256 c3a1da5b3618ec97…

MALICIOUS

Office (OLE) / .XLS

205.5 KB Created: 2020-10-01 02:50:32 Authoring application: Microsoft Excel
MD5: 10326f265eb4708ce78a21f43dcf94f4 SHA-1: b531be1c57191c54181b60126f2322df8df1788c SHA-256: c3a1da5b3618ec97bd9088c80f6479b85d3f01a91b6b1a6b84db7416cd203ec1
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet identified as encrypted. The presence of an auto-open macro suggests an intent to automatically execute code when the spreadsheet is opened. The document body is heavily obfuscated and unreadable, providing no further clues about the specific lure or payload. Due to the lack of readable content and specific script details, the exact functionality and family remain undetermined.

Heuristics 2

  • 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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