Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c9cf8e1d2c48fd88…

MALICIOUS

Office (OLE)

955.0 KB Created: 2010-10-05 07:59:00 Authoring application: Microsoft Office Word First seen: 2017-09-14
MD5: f28af60e871c1e234d8997d76b84bace SHA-1: bb40abac7db9456fbafb1036310f1eca457f3aaf SHA-256: c9cf8e1d2c48fd88318684efaa6000dc74fa2b0a5de3dafe5b700a9908dedda6
362 Risk Score

Malware Insights

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

The sample is a Microsoft Word document that exploits CVE-2007-3899, a memory corruption vulnerability, to execute arbitrary code. It contains an embedded PE executable (MZ header verified) and an Ole10Native package, both of which are designed to drop an auto-executable payload. The document body itself is a technical guide, likely a lure, and does not contain malicious instructions. The embedded executable is the primary payload, and the URLs suggest potential command and control or further payload download locations.

Heuristics 9

  • CVE-2007-3899 — Microsoft Word malformed string memory corruption critical CVE likely CVE_2007_3899
    Word OLE document has the MS07-060 malformed-string exploit shape: a Word 97-family FIB points to a malformed DOP/string-table region with an abnormal INT_MAX run, inflated text counters, and exploit payload or Mdropper.Z campaign evidence.
  • OLE with Ole10Native — possible CVE-2026-21514 exploitation high CVE likely CVE_2026_21514
    Document contains a Word OLE object with Ole10Native plus executable, PE, or risky remote-link indicators. CVE-2026-21514 exploits OLE metadata validation; this stronger structure is treated as likely exploitation.
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • Ole10Native package drops an auto-executable payload critical OFFICE_PACKAGE_RISKY_FILE
    OLE Package displayName or fullPath ends in a directly auto-executable extension (a runnable binary or a script the default shell host runs on double-click). Embedding such a payload inside an Office document has no benign authoring use — it is a malware-delivery dropper.
  • Reference to WinExec API high SC_STR_WINEXEC
    Reference to WinExec 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
  • 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://www.mcu51.com/search.asp?txtitle=�� In document text (OLE body)
    • http://www.mcu51.com/product/google.asp?q=In document text (OLE body)
    • http://www.mcu51.comIn document text (OLE body)
    • http://www.mcu51.com/sscom.txtIn document text (OLE body)
    • http://www.mcu51.com/count/counternoview.aspIn document text (OLE body)
    • http://www.mcu51.com/bbs/find.aspIn document text (OLE body)
    • http://www.c51bbs.com/c51bbs/find.aspIn document text (OLE body)
    • http://www.laogubbs.com/In document text (OLE body)
    • http://www.21icbbs.comIn document text (OLE body)
    • http://www.mcu51.com/sscom.htmIn document text (OLE body)
    • http://www.mcu51.com/download/sscom.rarIn document text (OLE body)
    • http://www.netmastersllc.comIn document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OLE body)
    • http://ns.adobe.com/iX/1.0/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_office_0001ee6a.exe embedded-pe Office MZ+PE at offset 0x1EE6A 851350 bytes
SHA-256: 961cc40dfec5f0be503a0bb62601770984c7cafc2816ce8d7fdfd57810d4d657
ole10native_00.bin ole-package OLE Ole10Native stream: ObjectPool/_1400002649/Ole10Native 789612 bytes
SHA-256: 43db5256609931b4bb069e7f5c8427656f42834085b55c6c1beb2c29224308c7

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