Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c496ae60e0a93f6…

MALICIOUS

Office (OLE)

940.9 KB Created: 2006-01-25 08:30:00 Authoring application: Microsoft Office Word
MD5: 08a097cfbe6db3bb29c36fb5bcce76de SHA-1: df630ac51cddb2b49e8fa985eeaf5b3d3477ac51 SHA-256: 6c496ae60e0a93f62b61b463012781a4af289819a0d713a6fc25dc7c80dba8bb
262 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an OLE document with a large appended payload, indicating it likely contains and executes malicious code. Heuristics indicate the use of CreateProcess, ShellExecute, VirtualAlloc, LoadLibrary, and GetProcAddress APIs, suggesting the execution of a second-stage payload. An embedded URL, http://xwpl.china, is present and likely serves as the source for this payload. The document's structure and API calls are consistent with a macro-based downloader.

Heuristics 8

  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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 963,488 bytes but its declared streams total only 21,151 bytes — 942,337 bytes (98%) 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).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://xwpl.china
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.iec.ch

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