MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
The file is a malicious OLE document that contains an embedded OLE object with suspicious static findings, including a large slack region and unreadable streams. The document body discusses radar systems, likely as a lure to disguise the malicious embedded content. The embedded object is the primary indicator of malicious intent.
Heuristics 3
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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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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 29,184 bytes but its declared streams total only 9,421 bytes — 19,763 bytes (68%) 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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CFB header with no readable streams medium OLE_PARSE_EMPTY_STREAMSThe file begins with a valid OLE2/CFB header but exposes no directory streams. A non-empty compound document with an unreadable directory is anomalous — it is seen with truncated/corrupt files and, more importantly, with content deliberately shifted off byte boundaries to defeat parsers while the host application still recovers the object.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
embedded_office_off00001e40.ole293145d55652a765fa1fd2bcfb17fbc8970722dea95f183b1d48d4ed3a3ebb89 |
embedded-office | Embedded OLE/CFB Office body inside ole container at offset 0x1E40 | 21440 bytes |
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