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

Static analysis result for SHA-256 b75c6e9f52bf6291…

MALICIOUS

Office (OLE) / .XLS

485.0 KB Created: 2021-12-17 13:23:39 Authoring application: Microsoft Excel
MD5: 991ada3b96847e64fe7e4b2f5e0f92f5 SHA-1: eea856a0feb0c1d39965a40914bb33531d812a37 SHA-256: b75c6e9f52bf6291347a3b494255056eba2c9a5d10eccd00a64339b405da0dbd
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 execute automatically upon opening the file. While no specific payload or URL was extracted, the encrypted nature and automatic execution point towards a malicious intent, likely for delivering a secondary stage payload.

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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