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

Static analysis result for SHA-256 1dffc82793413a25…

MALICIOUS

Office (OLE) / .PPT

292.0 KB Created: 2009-05-21 02:07:35 Authoring application: Microsoft PowerPoint
MD5: cc53da7b22a6504b85e296998b09cd7f SHA-1: f98c8f0c059072e7aac0c24237af48b2f1cd8b91 SHA-256: 1dffc82793413a25b0f37aca639cbde13e8619801f3ca7dc251a7e67b4788834
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

Static analysis detected several high-severity heuristics, including a NOP sled and XOR-encoded strings with a key of 0x31. The large slack space in the OLE structure is also anomalous. These indicators suggest the file contains obfuscated malicious code, likely intended to download and execute a secondary payload. The specific attack pattern is inferred from the nature of these obfuscation techniques commonly used in malware delivery.

Heuristics 3

  • XOR-encoded strings (key 0x31) critical SC_XOR_ENCODED
    Found 1 Windows library/API name(s) XOR-encoded with single-byte key 0x31: 'ADVAPI32.DLL'
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 299,012 bytes but its declared streams total only 18,081 bytes — 280,931 bytes (94%) 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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