MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1027 Obfuscated Files or Information
The sample is a malicious Office document exhibiting significant slack space and XOR-encoded strings, indicating an attempt to obfuscate malicious content. The PEB access heuristic further suggests code execution or manipulation. Without a document body or scripts, the exact payload and delivery mechanism remain unclear, but the obfuscation techniques point towards a downloader or exploit-laden document.
Heuristics 3
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XOR-encoded strings (key 0x4D) critical SC_XOR_ENCODEDFound 7 Windows library/API name(s) XOR-encoded with single-byte key 0x4D: 'LoadLibraryA', 'LoadLibraryW', 'GetProcAddress', 'VirtualAlloc', 'CreateProcessA', 'CreateProcessW', 'RegOpenKeyExW'
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PEB access via FS segment (x86) high SC_PEB_ACCESSPEB access via FS segment (x86)
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 528,384 bytes but its declared streams total only 20,632 bytes — 507,752 bytes (96%) 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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