Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c461461944bc8d06…

MALICIOUS

Office (OLE)

105.5 KB Created: 2008-03-24 01:08:26 Authoring application: Microsoft Excel
MD5: 257ede081d4ed717e8f920a51b515b65 SHA-1: 3ffb0c7705c0cff37b2f6ae978279d49762f64fd SHA-256: c461461944bc8d062c0a54e82535dae3fdcd11914da5543f7404933c89c568eb
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell

The sample is an Excel 4.0 macro sheet, identified by multiple critical heuristics including OLE_XLM_AUTOOPEN and OLE_XLS_FORMULA_MACRO_VIRUS. The presence of 'Auto_Open' and dangerous formula APIs like RUN indicates that the macro sheet is designed to execute code upon opening. The embedded script comments explicitly mention 'Excel Formula Macro Virus (XF.Classic)' and 'Poppy by VicodinES', suggesting a known malware lineage. The script's intent is to execute arbitrary commands, likely to download and run a second-stage payload.

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
0d4fe2ec6739b121831bd7dd7fa860a704f7059071d08926b5c226d8e3704fbc		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 30888 bytes

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