MALICIOUS
100
Risk Score
Malware Insights
The sample is an Excel spreadsheet exhibiting a critical heuristic for XOR-encoded strings with a key of 0xFC. Additionally, it shows a high heuristic for OLE slack space anomaly, indicating potential obfuscation or packed content. While no document body or scripts were extracted, the presence of encoded strings strongly suggests malicious intent, likely for delivering a secondary payload or executing arbitrary code. The confidence is moderate due to the lack of explicit script or body content to confirm the exact execution flow.
Heuristics 2
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XOR-encoded strings (key 0xFC) critical SC_XOR_ENCODEDFound 5 Windows library/API name(s) XOR-encoded with single-byte key 0xFC: 'kernel32.dll', 'kernel32.dll', 'LoadLibraryA', 'GetProcAddress', 'VirtualAlloc'
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 96,256 bytes but its declared streams total only 15,628 bytes — 80,628 bytes (84%) 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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