Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f2769d6dddcf9101…

MALICIOUS

Office (OLE)

608.5 KB Created: 2020-05-04 21:59:42 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: bbe9400c16b0d81a891679d3c5de4d01 SHA-1: 722f7a69c7a70ecccd290a80ad95ce19e90b7875 SHA-256: f2769d6dddcf9101860c18bbafd163c150f5706ba72ac8774cf234ee8f2eccc3
100 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 multiple heuristic firings including OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN. The presence of encrypted macros suggests an attempt to hide malicious functionality, commonly used for initial access through spearphishing attachments. No specific IOCs were extracted from the limited document body.

Heuristics 3

  • OLE metadata lists many Excel 4.0 macro sheets high 2 related findings OLE_XLM_DOCPROPS_MACROSHEET_INVENTORY
    Workbook contains a BIFF Excel 4.0 macro-sheet marker and its clear OLE DocumentSummaryInformation stream lists many MacroN sheet titles. This is a useful static signal when FILEPASS encryption prevents formula extraction from the workbook stream.
  • 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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