Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0af01a26ee1ecbbf…

MALICIOUS

Office (OLE)

599.5 KB Created: 2020-05-04 21:59:42 Authoring application: Microsoft Excel First seen: 2020-08-25
MD5: e4b8a7bf025ef722d6a18faa41331530 SHA-1: 7510d83782d38977de33bd52f5aaa6843660e487 SHA-256: 0af01a26ee1ecbbf39c0aa8c117c55fe9e6227fdca37ecda72538e3e4cbc140c
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. This type of file is commonly used to download and execute secondary payloads. The presence of an AUTOOPEN macro further suggests an intent to automatically run malicious code when the document is opened.

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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