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

Static analysis result for SHA-256 d715a05fb7470b39…

MALICIOUS

Office (OLE) / .XLSX

247.5 KB Created: 2020-09-14 21:28:14 Authoring application: Microsoft Excel
MD5: c4f2a54b26d5311b433814d6a011d116 SHA-1: 2dc03895f765616e2c91a7f86907e95eb9a9ae2a SHA-256: d715a05fb7470b39587a83a953b8bed6951dd4601a5a893617916edf782706a1
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 suggests that the macro sheet is intended to be executed automatically. The document body is heavily obfuscated and truncated, preventing a detailed analysis of its specific intent. However, the presence of encrypted macros strongly implies a malicious payload delivery mechanism.

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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