Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7c398cc722f79e55…

MALICIOUS

Office (OLE)

520.0 KB Created: 2020-07-14 08:40:55 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: 0cbeaee243b3d87ebde4437a38da1a3e SHA-1: 89d03d4e777ba41ad8071ecb5123aa52c9b856eb SHA-256: 7c398cc722f79e55d41ae267d2ab35cb401e721f710ce7ba249a864195c33af3
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

Static analysis identified an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro suggests an attempt to automatically execute code when the spreadsheet is opened. The document body was unreadable, preventing further analysis of its specific lure or 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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