Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4a1345030ec49f6f…

MALICIOUS

Office (OLE)

350.5 KB Created: 2020-07-13 11:03:58 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: ff273218e30691fd7953a8d638a2aead SHA-1: 9dc365694b427e16f0476ad8a623e5279add1a73 SHA-256: 4a1345030ec49f6f14b655fd70fbfb6b0822c8f0d373d2e88aaa4a0def887642
60 Risk Score

Malware Insights

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

The file is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristics. This suggests the file is designed to be delivered as an attachment, likely via spearphishing, and execute malicious macros upon opening. No specific family could be identified, and no IOCs were directly extractable from the provided evidence.

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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