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

Static analysis result for SHA-256 e4521a3422731219…

MALICIOUS

Office (OLE) / .BEI

145.0 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 3da5331d9e08771a27225b8b4694f550 SHA-1: 0a6bb68e236991c583f227ed81a7e04d6cb0a30a SHA-256: e4521a342273121940cabc53bcd5506381dad9b8531c61ce63c035d3b3839f12
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The sample is an OLE document with a significant amount of slack space, indicating potential obfuscation. A critical heuristic identified XOR-encoded strings with a key of 0xFC. The document body contains a list of Beijing restaurants, suggesting a social engineering or phishing lure. No scripts were extracted from this sample.

Heuristics 2

  • XOR-encoded strings (key 0xFC) critical SC_XOR_ENCODED
    Found 8 Windows library/API name(s) XOR-encoded with single-byte key 0xFC: 'LoadLibraryA', 'LoadLibraryA', 'GetProcAddress', 'GetProcAddress', 'VirtualAlloc', 'VirtualAlloc', 'CreateProcessA', 'CreateProcessA'
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 148,480 bytes but its declared streams total only 17,487 bytes — 130,993 bytes (88%) 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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