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, suggesting obfuscation of malicious content. The large amount of slack space in the OLE structure is also anomalous. While no specific malicious behavior like network communication or file drops was directly observed in the static analysis, the obfuscation strongly indicates malicious intent. The lack of a document body or script content limits further analysis of the specific lure or payload.
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 148,480 bytes but its declared streams total only 15,628 bytes — 132,852 bytes (89%) 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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