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

Static analysis result for SHA-256 1767ed44981c64a2…

MALICIOUS

Office (OLE) / .XLS

176.0 KB Created: 2021-02-23 19:30:17 Authoring application: Microsoft Excel
MD5: 990f2a312067bcc46c0af0129b7a871b SHA-1: 54b2290b1875024c294045d473a33fac0801ed14 SHA-256: 1767ed44981c64a2a607bd5ead49b5a812af178c6f46aae878339baf1f55a956
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing an encrypted Excel 4.0 macro sheet, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This suggests the file is designed to execute malicious macros when opened. No specific family could be identified, and no IOCs were extracted.

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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