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

Static analysis result for SHA-256 237a25e43659df7f…

MALICIOUS

Office (OLE) / .DOC

72.8 KB Created: 2006-01-25 08:30:00 Authoring application: Microsoft Office Word
MD5: 2ccab6415a77dc7b04be234cb261f613 SHA-1: 85e76b95fcf4babca6bc6f9d11572d7265701fad SHA-256: 237a25e43659df7f9fc690c2689b7077002c78d292104d9bf5ab57f368633054
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1027 Obfuscated Files or Information T1218 Signed Binary Proxy Execution

The sample exhibits high-confidence heuristic firings related to API hash resolution and PEB access, indicating sophisticated evasion techniques. References to VirtualAlloc, LoadLibrary, and GetProcAddress suggest the code is preparing to dynamically load and execute further malicious code. The large slack space in the OLE structure is also anomalous. Without a document body or script content, the exact payload and delivery mechanism remain unclear, but the technical indicators point towards a downloader or dropper.

Heuristics 7

  • x86 GetPC stub (CALL $+5; POP EAX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EAX)
  • PEB access via FS segment (x86) high SC_PEB_ACCESS
    PEB access via FS segment (x86)
  • PEB API-hash resolver high SC_API_HASH_RESOLVER
    PEB access followed by ROR13-style API hashing, a common position-independent shellcode import resolver
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 74,597 bytes but its declared streams total only 21,151 bytes — 53,446 bytes (72%) 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).
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API

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