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

Static analysis result for SHA-256 2f43701f38c919b4…

MALICIOUS

Office (OLE) / .XLS

228.0 KB Created: 2020-09-23 01:01:35 Authoring application: Microsoft Excel
MD5: b9eceb5c12f673037350a06fa482fb12 SHA-1: 9f2cd7d5c13b45855eac6b244ed266b87462502d SHA-256: 2f43701f38c919b4cb359cdd37edb57d222b8106edeeb780a1ed7b783c57942b
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is 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 macros are designed to run automatically upon opening the spreadsheet. Due to the encrypted nature of the macro sheet, the specific actions and payloads could not be determined, leading to an unknown family attribution and a moderate confidence score.

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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