XL4Poppy — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 33b698f6375a552f…

MALICIOUS

Office (OLE) / .XLS

5.36 MB Created: 1999-12-25 07:56:40 Authoring application: Microsoft Excel
MD5: 399a9240d7f8d0937e21cc7ab08f5cb2 SHA-1: e7c0c89970f94f623b819a4357ba7b4fa6525d29 SHA-256: 33b698f6375a552f05cf4a7c32041bf8f12bfd57f51e340fb8d9e7ab9ed82fe1
180 Risk Score

Malware Insights

XL4Poppy · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1546.001 Event Triggered Execution: Known Run Keys or Registry Run Keys

The file is identified as a legacy Excel 4.0 (XLM) macro virus, specifically the XL4Poppy variant. The embedded text explicitly mentions 'Add New Workbook, Infect It, Save It As Book1.xls', indicating a self-propagation mechanism. The heuristics confirm the presence of XLM Auto_Open macros and legacy macro virus markers, strongly suggesting this family.

Heuristics 3

  • Excel 4.0 (XLM) Auto_Open + macro sheet critical OLE_XLM_AUTOOPEN
    Workbook contains an Auto_Open / Auto_Close defined name together with an Excel 4.0 macro sheet — the canonical XLM auto-execution shape used by malware families such as Emotet and QakBot.
  • Legacy Excel formula macro virus marker critical OLE_XLS_FORMULA_MACRO_VIRUS
    Workbook stream contains self-identifying legacy Excel formula macro virus markers. This indicates the document carries formula macro virus content even when no VBA project or modern XLM macro-sheet structure is present.
  • Legacy XLM macro-virus family marker critical OLE_XLM_LEGACY_MACRO_VIRUS
    Workbook contains an Excel 4.0 macro Auto_Open chain and legacy macro-virus family strings. This is a narrow indicator for infected XLM workbooks rather than ordinary formula use.

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