MALICIOUS
220
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
The file is an Excel spreadsheet containing a large VBA macro. Heuristics indicate the presence of a Workbook_Open or Auto_Open macro, which is commonly used to execute malicious code upon opening the document. The macro utilizes CreateObject and exhibits VBA Chr string obfuscation, suggesting it's designed to download and execute a second-stage payload. The presence of 'macros.bas' as an extracted artifact further supports this.
Heuristics 6
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Workbook_Open macro high OLE_VBA_WBOPENWorkbook_Open macro
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Auto_Open macro high OLE_VBA_AUTOAuto_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.bas48a04751a5d4364beb6be6ec8f2be4cddff6b810d1ece71188c778199ced6140 |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 188613 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 40 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.
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