MALICIOUS
100
Risk Score
Malware Insights
MITRE ATT&CK
T1027 Obfuscated Files or Information
The sample is an Excel spreadsheet exhibiting a critical heuristic for XOR-encoded strings, with the XOR key identified as 0xFC. Additionally, a high heuristic firing indicates a significant amount of slack space within the OLE structure, suggesting potential obfuscation or embedded malicious content. While no specific payload or delivery mechanism is directly evident from the limited document body, the presence of obfuscated strings strongly suggests an intent to conceal malicious functionality.
Heuristics 2
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XOR-encoded strings (key 0xFC) critical SC_XOR_ENCODEDFound 3 Windows library/API name(s) XOR-encoded with single-byte key 0xFC: 'kernel32.dll', 'LoadLibraryA', 'GetProcAddress'
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 55,808 bytes but its declared streams total only 15,628 bytes — 40,180 bytes (72%) 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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