MALICIOUS
200
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1566.001 Spearphishing Attachment
The file is an Excel document containing VBA macros, specifically a Workbook_Open and Auto_Open macro, which are designed to execute automatically. The critical heuristic indicates that the macro uses ExecuteExcel4Macro, a known technique for running malicious code. The ClamAV detection of 'Xls.Trojan.Divi-2' further supports its malicious nature. The macro attempts to obfuscate its actions by using constants and API calls, but its primary function appears to be the execution of a secondary payload, likely named 'BASE5874.XLS', which is a common tactic for malware droppers.
Heuristics 5
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ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAVClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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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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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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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.basa440f406a68ae2c73dc965decfc57f69bc25678ee55f150b92bc28a84b138da0 |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 10920 bytes |
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Detection
ClamAV:
Xls.Trojan.Divi-2
Obfuscation or payload:
unlikely
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