MALICIOUS
100
Risk Score
Malware Insights
The sample is an Excel spreadsheet exhibiting a significant slack space anomaly and containing XOR-encoded strings with a key of 0xFC. While no VBA scripts were explicitly extracted, the presence of these indicators strongly suggests malicious intent, likely involving obfuscated code execution. The large slack space is a common technique to hide malicious payloads within Office documents.
Heuristics 2
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XOR-encoded strings (key 0xFC) critical SC_XOR_ENCODEDFound 7 Windows library/API name(s) XOR-encoded with single-byte key 0xFC: 'LoadLibraryA', 'GetProcAddress', 'VirtualAlloc', 'CreateProcessA', 'RegOpenKeyExA', 'RegOpenKeyExA', 'ShellExecuteA'
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 508,008 bytes but its declared streams total only 15,628 bytes — 492,380 bytes (97%) 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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