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

Static analysis result for SHA-256 7a67fcad4f5872a0…

MALICIOUS

Office (OLE) / .XLS

181.5 KB Created: 2020-11-10 04:28:45 Authoring application: Microsoft Excel
MD5: 7a792f8c8acc5d62093f8025c1af0a44 SHA-1: 2e41ab8d339cda55f699c817e479a6999810aa54 SHA-256: 7a67fcad4f5872a0e76cca2d902c7dcc503749f07619de60faaf51454baf549e
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 it is designed to execute automatically upon opening. The document body is unreadable, but the heuristics strongly suggest a malicious macro execution.

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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