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

Static analysis result for SHA-256 1ac35384dff2ea3e…

MALICIOUS

Office (OLE) / .XLS

279.0 KB Created: 2021-12-22 08:49:03 Authoring application: Microsoft Excel
MD5: 98d4becd3ab42f49a0b320c418a557d1 SHA-1: 8a474700607936cb1dc2a186064c1ea08c08ebbc SHA-256: 1ac35384dff2ea3e9eed3bb7c32010546bd81d68f8a369251c060c03864f88b0
60 Risk Score

Malware Insights

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

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristics. This strongly suggests the file is intended to deliver a malicious payload via macro execution. No specific IOCs were extracted, and the document body was unreadable.

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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