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

Static analysis result for SHA-256 de8e5ba6a33ee645…

MALICIOUS

Office (OLE) / .XLS

229.5 KB Created: 2020-10-01 02:50:32 Authoring application: Microsoft Excel
MD5: 7761abcff5a137aa4ecc0094f8d8e7d9 SHA-1: 57b42b2d3d12b20d39b137151a58829c7bb73511 SHA-256: de8e5ba6a33ee645dcd96bcdfdd88ab8f34877629cd178c87d1e474408e99e97
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests that malicious code is intended to execute automatically when the file is opened. Due to the encrypted nature of the macro sheet, the specific payload and execution method could not 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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