MALICIOUS
100
Risk Score
Malware Insights
MITRE ATT&CK
T1027 Obfuscated Files or Information
The sample is a malicious 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 a large portion of the file is unused and potentially contains hidden data. The presence of encoded strings suggests an attempt to conceal malicious code or data within the document. Without further script or body content, the exact payload delivery mechanism remains unclear, but the obfuscation points towards a downloader or dropper.
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: 'LoadLibraryA', 'GetProcAddress', 'VirtualAlloc', 'CreateProcessA', 'RegOpenKeyExA'
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 129,536 bytes but its declared streams total only 15,628 bytes — 113,908 bytes (88%) 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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