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

Static analysis result for SHA-256 46b04cadb09c2d60…

MALICIOUS

Office (OLE) / .XLS

240.0 KB Created: 2020-09-20 23:05:47 Authoring application: Microsoft Excel
MD5: e06937ce4b8979743b55028e723fdd86 SHA-1: 9b2820eff3f81dd1f3b263612d12e3dbb3fa0c55 SHA-256: 46b04cadb09c2d60d5731eb95a4ffb887d22b86a7f059b43339d129cf15e871f
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 OLE_XLM_AUTOOPEN heuristic further confirms the presence of an auto-executable macro. Due to the encrypted nature and lack of readable document body or script content, the exact payload and delivery mechanism cannot be determined, but the presence of these heuristics strongly suggests a malicious macro-based 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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