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

Static analysis result for SHA-256 ca7004c847cc480e…

MALICIOUS

Office (OLE) / .XLS

178.0 KB Created: 2020-10-13 20:45:49 Authoring application: Microsoft Excel
MD5: 4639d4fe78f8cc12c8a837136fa0bd82 SHA-1: 94786cc511cb62a8738ee95d6c53d4c06eddae80 SHA-256: ca7004c847cc480e7013d6b28fd8f93b9774bdca2dea8076fdc3f8a057aa273e
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro suggests it is designed to execute automatically upon opening. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure or payload. Due to the obfuscation and lack of readable content, the exact family and IOCs cannot be determined.

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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