Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 70c4f6f9d8a539e6…

MALICIOUS

Office (OLE)

374.5 KB Created: 2006-12-26 06:59:00 Authoring application: Microsoft Excel
MD5: 0e439b4117997df96c8b80c9ef4d5b8e SHA-1: 920d3a329588c2fbe440b359b7c26a859fe7e9b2 SHA-256: 70c4f6f9d8a539e6569f0ba9e67ae2fb11a577ea10ee4123f13831037348b434
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel file containing legacy Excel 4.0 (XLM) macros, specifically triggering an Auto_Open function. This indicates an attempt to execute arbitrary code upon opening the document. The presence of 'XL4Poppy' in the document body and the XLM macro sheet suggests this is a known macro-based malware dropper. No VBA macros were found to contain executable statements.

Heuristics 5

  • 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.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
91d39e408fca03bf2ac6346c5aa05ec2e7cdbe5e1392f2be97011402bc9c5935		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 486399 bytes
macros.bas
87d474f057c15523878d5f56cfdb29d9e787def601de92ed79d2930d3c7d5046		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2106 bytes

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