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

Static analysis result for SHA-256 dcc09a79f41cd1b6…

MALICIOUS

Office (OLE) / .XLS

193.5 KB Created: 2020-11-09 01:16:41 Authoring application: Microsoft Excel
MD5: 987a123a6cf4403d8e8e9880c94ad3d7 SHA-1: 3b88ce3d5fcc935eb8247aecb8fa35ff1f31e209 SHA-256: dcc09a79f41cd1b6257736874a22fa70636f2ed5afba90762f78f1be260cb83c
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AutoOpen macro (OLE_XLM_AUTOOPEN) suggests that the malicious code is designed to execute automatically upon opening the spreadsheet. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure or payload.

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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