Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7421787452f88f41…

MALICIOUS

Office (OLE)

27.5 KB Created: 1999-08-17 07:20:07 Authoring application: Microsoft Excel
MD5: a5918464a55a4425cb330b1218d18840 SHA-1: 5c9cef1dd675669e5a54b219c049faa3d49f3806 SHA-256: 7421787452f88f41a1b84c6e4bd7bd6a71afc081e65457bc471e08ab53d0dde2
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This Excel 4.0 macro-enabled document contains heuristics indicating the presence of an Auto_Open macro, which is a known technique for executing malicious code upon opening. The macro sheet contains references to 'Poppy' and 'XF.Classic', suggesting it's a variant of a known Excel macro virus. The document body attempts to lure the user into believing it's a shipping document requiring changes, masking the malicious intent of the embedded XLM macro.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • 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.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
de56cdd59b423919f9d128bdd3884ed767a1befba77261afe1cd04809d6846c6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7377 bytes

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