MALICIOUS
180
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1566.001 Spearphishing Attachment
T1027 Obfuscated Files or Information
The file is an OLE document containing VBA macros, specifically triggering AutoOpen and Document_Open heuristics, indicating an attempt to automatically execute code upon opening. The 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic flagged VBA Chr string obfuscation within the 'macros.bas' file, suggesting the macros are intentionally obscured. The large slack space in the OLE structure is also a suspicious artifact. The primary intent appears to be the execution of obfuscated VBA code, likely to download and run a secondary payload.
Heuristics 5
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 65,536 bytes but its declared streams total only 30,283 bytes — 35,253 bytes (54%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
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AutoOpen macro high OLE_VBA_AUTOOPENAutoOpen macro
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Document_Open macro high OLE_VBA_DOCOPENDocument_Open macro
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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.basc9e6ec471703de035a81de8542e5bb8dae820ab270e604e9196681d9b48b867d |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 16660 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 14 Chr/ChrW string-construction calls.
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