Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3d4dd7d5a21b5404…

MALICIOUS

Office (OLE)

822.0 KB Created: 2020-07-06 14:05:22 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: cac62da91b747637c6b2631d3b24d272 SHA-1: 33541858749a90b6dd14ab3dd29763a91eba1dd3 SHA-256: 3d4dd7d5a21b54045a71f154434e4ae581c5ffb3b34954ee22ad97292949f008
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel document containing encrypted Excel 4.0 macros, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro suggests an attempt to automatically execute code upon opening. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure or payload.

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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