Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1dd32cb31dd0af49…

MALICIOUS

Office (OLE)

977.0 KB Created: 2010-10-05 07:59:00 Authoring application: Microsoft Office Word First seen: 2019-06-27
MD5: 1c7eed185b21fce25b84558b628a836a SHA-1: bc72911a26888ba0694acdde0f981c64ee3e498b SHA-256: 1dd32cb31dd0af490985699f30cfad1d6ecba697814c247656fa03f45251045d
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 embedded code. It contains an embedded PE executable and leverages OLE package functionality to drop and run this payload. The document body contains technical-sounding text which is likely a lure, while the embedded executable and exploitation techniques indicate a malicious intent to compromise the user's system.

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/officeDocument/2006/bibliographyIn document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/cusMIn 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_00023a6a.exe embedded-pe Office MZ+PE at offset 0x23A6A 854422 bytes
SHA-256: 3db1e80480234102c60c38a68f38325c1a59c29fd5226c20fba33a2b67124006
ole10native_00.bin ole-package OLE Ole10Native stream: ObjectPool/_1400002649/Ole10Native 789612 bytes
SHA-256: 43db5256609931b4bb069e7f5c8427656f42834085b55c6c1beb2c29224308c7

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