Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 34238bebbcca4e79…

MALICIOUS

Office (OLE)

245.0 KB
MD5: 6dd3071add114c64ca025c37fdb288cb SHA-1: 6052bfe32b790135693615a1495e8807cb6bc78e SHA-256: 34238bebbcca4e79b48c293c64411cc632f7c4f53584d431d0a446e2daa0e96d
180 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The file is identified as malicious and exhibits several high-severity heuristics, including XOR-encoded strings and an EMF object within an OLE stream. The document body suggests it's a test file, possibly designed to embed other Office documents (Excel, PowerPoint) and exploit OLE structures. The PEB access heuristic may indicate attempts to evade detection or manipulate process information.

Heuristics 4

  • Office EPRINT stream contains EMF object high CVE related OLE_EPRINT_EMF_OBJECT
    OLE ObjectPool contains an EPRINT stream with EMF data. This is rare in normal documents and is CVE-2007-3893/MS07-046-family evidence when paired with Office exploit payload anomalies, but the malformed EMF record is not proven by this rule alone.
  • XOR-encoded strings (key 0x81) critical SC_XOR_ENCODED
    Found 8 Windows library/API name(s) XOR-encoded with single-byte key 0x81: 'kernel32.dll', 'kernel32.dll', 'kernel32.dll', 'kernel32.dll', 'advapi32.dll', 'advapi32.dll', 'KERNEL32.DLL', 'LoadLibraryA'
  • PEB access via FS segment (x86) high SC_PEB_ACCESS
    PEB access via FS segment (x86)
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 250,884 bytes but its declared streams total only 60,708 bytes — 190,176 bytes (76%) 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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