Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0fba1f02cd2872ef…

MALICIOUS

Office (OLE)

163.0 KB Created: 2020-04-08 14:30:53 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 0a054818926d97f4100774255a908dba SHA-1: de572eddd30b34d1e328c8d5fb986cc1e04c82e8 SHA-256: 0fba1f02cd2872efc4cdc6806bc49d786005f590971ee31f97ce71c1ccf87fe2
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, a common technique for obfuscating malicious content. The presence of an 'AUTOOPEN' macro indicates that malicious code will execute automatically when the document is opened. The heuristics strongly suggest the use of Excel 4.0 macros, which fall under the Visual Basic scripting technique.

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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