Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ba47cdd310892146…

MALICIOUS

Office (OLE)

919.0 KB Created: 2020-07-07 10:47:28 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 885c40f48464f690f83f97efd6a0b093 SHA-1: cf6f858fe15db15f3ce94a4ab1aabbdd39bad5b1 SHA-256: ba47cdd310892146ad95f73ca30973eab4c3f52d9c1a1035ded2f62f87ed5fda
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro suggests it attempts to execute automatically upon opening. Given these factors, the likely attack pattern is initial access through spearphishing, leading to the execution of malicious Excel 4.0 macros.

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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