Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 e4e302fa4ffe5b4f…

MALICIOUS

Office (OLE) / .DOC

161.0 KB Created: 2008-03-05 03:19:00 Authoring application: Microsoft Office Word
MD5: 0279b30f1395bac1177161a7d28503a6 SHA-1: f090351dcc630f0c588202da22385d29b36592f6 SHA-256: e4e302fa4ffe5b4ffe02764a3c3c651e0e8a6b1764120e775dbe478a7b96fd15
100 Risk Score

Malware Insights

MITRE ATT&CK
T1027 Obfuscated Files or Information

The sample is a malicious OLE document. Static analysis revealed XOR-encoded strings with a key of 0x63 and a significant amount of slack space (87%) within the OLE structure, indicating an attempt to obfuscate malicious content. The document body is unreadable, providing no further clues to the specific lure.

Heuristics 2

  • XOR-encoded strings (key 0x63) critical SC_XOR_ENCODED
    Found 4 Windows library/API name(s) XOR-encoded with single-byte key 0x63: 'LoadLibraryA', 'CreateProcessA', 'ExitProcess', 'CreateFileA'
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 164,840 bytes but its declared streams total only 20,635 bytes — 144,205 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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