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

Static analysis result for SHA-256 d89e77e69f01110c…

MALICIOUS

Office (OLE) / .XLS

172.0 KB Created: 2020-11-09 01:17:34 Authoring application: Microsoft Excel
MD5: 84ea4288f99017624f8621c954c05986 SHA-1: cd0a74090232bd734f1d0a5b6ba7430e68b564f9 SHA-256: d89e77e69f01110c990cbab518653310724afd96f753f1ef0a4c8b12d021f694
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 encrypted macro sheet suggests an attempt to hide malicious code execution. The OLE_XLM_AUTOOPEN heuristic further confirms the presence of an auto-executable macro. Without a document body or script content, the exact payload and delivery mechanism remain unclear, leading to a moderate confidence score.

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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