Malicious Office (OLE) / .B — malware analysis report

Static analysis result for SHA-256 920ae57206ee29df…

MALICIOUS

Office (OLE) / .B

1.49 MB Created: 2008-12-20 04:43:59 Authoring application: Microsoft Excel
MD5: 8e83888877691e90d544b1675e4eaba3 SHA-1: f959221ca5876a0144e291525288310a6bf3918e SHA-256: 920ae57206ee29df1851f7f59b02ad765d1c7bb417df6ca4192e39716f543b7e
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1566.001 Spearphishing Attachment

The file contains critical heuristic firings indicating the presence of legacy Excel 4.0 (XLM) macros, specifically an Auto_Open entry. These macros are known to be used for malicious execution, with the 'XL4Poppy' and 'Normal_MacroVirus' markers suggesting a legacy macro-virus family. The macro sheet contains dangerous formula APIs like RUN, indicating it's designed to execute arbitrary commands. The document body and script excerpts, though partially obscured, contain references to file copying and macro behavior, reinforcing the malicious intent.

Heuristics 4

  • 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.
  • 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 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
90027ffe26b94e5113c1395123fbe7ee144e123fe29efe6bf3f74efc0bac626f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 696435 bytes

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