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

Static analysis result for SHA-256 022df6eb40380388…

MALICIOUS

Office (OLE) / .XLS

194.0 KB Created: 2021-02-23 19:30:51 Authoring application: Microsoft Excel
MD5: 6f35f127e4b4509a0b8370b459387692 SHA-1: 8bd9384bb547d2b006f936fad9d8d41d141a505f SHA-256: 022df6eb40380388e043a792bab7091a449111c32e0fca6fb54fb3d1fd8fd807
60 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an OLE_XLM_AUTOOPEN heuristic suggests that the macro is designed to execute automatically upon opening the document. This is a common technique for delivering malicious payloads, often distributed via spearphishing attachments.

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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