MALICIOUS
100
Risk Score
Malware Insights
MITRE ATT&CK
T1027 Obfuscated Files or Information
The sample exhibits significant slack space within its OLE structure, a common characteristic of packed or obfuscated malware. The critical heuristic firing confirms the presence of XOR-encoded strings with a key of 0x81, indicating an attempt to conceal malicious code or data. While no specific family is identifiable, the obfuscation strongly suggests a downloader or a stage-one payload designed to evade static analysis.
Heuristics 2
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XOR-encoded strings (key 0x81) critical SC_XOR_ENCODEDFound 4 Windows library/API name(s) XOR-encoded with single-byte key 0x81: 'kernel32.dll', 'advapi32.dll', 'shell32.dll', 'ExitProcess '
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 82,237 bytes but its declared streams total only 17,055 bytes — 65,182 bytes (79%) 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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