MALICIOUS
180
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The file is an OLE document with significant slack space and an appended payload, indicating it is likely a container for malicious content. Heuristics suggest exploitation of a client execution vulnerability, likely delivered via spearphishing. The embedded OLE document further supports the presence of a secondary malicious component.
Heuristics 4
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Embedded Office document has suspicious static findings critical EMBEDDED_OFFICE_CHILD_STATIC_TRIAGEA CFB/OLE Office document was found inside another file type and its carved contents matched Office exploit or payload heuristics. This catches wrapped exploit documents where the top-level file routes to a PE, archive, or generic scanner instead of Office.
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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 126,528 bytes but its declared streams total only 16,486 bytes — 110,042 bytes (87%) 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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OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOADOLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
embedded_office_off00004c00.ole0d681ccbc0c9432d2fec2d2bab26b65a8c95ae1295e197a65e61e77700f3fb69 |
embedded-office | Embedded OLE/CFB Office body inside ole container at offset 0x4C00 | 107072 bytes |
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