Malware Insights
The sample is an Office OLE file with a high-confidence detection for VBA macros, specifically a Workbook_Open macro that uses CreateObject. This indicates an automated execution path upon opening the document. The presence of VBA Chr string obfuscation and auto-execution with execution tokens further supports this. While no specific URLs or network indicators were extracted, the macro's structure strongly suggests it's a downloader for a second-stage payload. The lack of explicit network IOCs or clear persistence mechanisms in the extracted data prevents higher confidence in family attribution.
Heuristics 5
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Workbook_Open macro high OLE_VBA_WBOPENWorkbook_Open macro
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CreateObject call high OLE_VBA_CREATEOBJCreateObject call
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VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXECCompiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGEOne or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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VBA macros detected medium OLE_VBA_MACROSDocument contains VBA macro code
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
macros.bas7c03adb704de98fba93aa5577ab394ece2f06b413ed9cc3bacd5cdf33a27fb92 |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 1167106 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 38 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.
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