Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 eec7f9b6ed5cb40c…

MALICIOUS

Office (OLE)

56.0 KB Created: 2020-05-18 07:32:17 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: e19e8f800fcfc086f39adbfbe7de9719 SHA-1: b04f25e7a96eccf825ed1a53ce883bf0be9d5314 SHA-256: eec7f9b6ed5cb40c1f0162cacde42f6b9c72c0fbdd6814c81f13eac725c5ec23
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, which is a common technique for delivering malware. The presence of encrypted macros suggests an attempt to hide malicious code that likely downloads and executes a secondary payload. No specific family could be identified due to the encryption.

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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