Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a9bef6aa979b0db2…

MALICIOUS

Office (OLE)

405.5 KB Created: 2012-06-03 21:30:00 Authoring application: Microsoft Office Word First seen: 2017-08-27
MD5: ab7d6043f110bb14c0daad1646d75a9d SHA-1: 1b4c30c7fd7f4fe5d723f97a8212b8cb8a07719b SHA-256: a9bef6aa979b0db2b469c3ef28ab33133acc4bf2dfe26677ff979085c02ee48c
502 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059 Command and Scripting Interpreter

The sample exploits CVE-2007-3899, a memory corruption vulnerability in Microsoft Word, to achieve code execution. It also leverages an OLE package to drop and execute a PE executable. The embedded OLE package contains URLs that are likely used to download and execute a second-stage payload, indicating a downloader or dropper functionality.

Heuristics 11

  • 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/COM security bypass — CVE-2026-21509 (Killbit/Protected View bypass) critical CVE related CVE_2026_21509
    OLE/COM security bypass — CVE-2026-21509 (Killbit/Protected View bypass)
  • 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 payload is a download-and-execute script critical OFFICE_PACKAGE_SCRIPT_DROPPER
    The OLE Package's embedded payload contains a script that hosts a shell (PowerShell/WScript/mshta), fetches a remote resource, and executes it — a download-and-run dropper. Embedding such a script inside an Office document via the Object Packager is a direct user-execution delivery technique (MITRE T1204.002), not a benign attachment.
  • 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 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
  • 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://ocsp.verisign.com0 Embedded OLE package script
    • http://nsis.sf.net/NSIS_ErrorEmbedded OLE package script
    • https://www.verisign.com/rpaEmbedded OLE package script
    • https://www.verisign.com/cps0*In document text (OLE body)
    • https://www.verisign.com/rpa0Embedded OLE package script
    • http://logo.verisign.com/vslogo.gif04Embedded OLE package script
    • http://crl.verisign.com/pca3-g5.crl04Embedded OLE package script
    • http://logo.verisign.com/vslogo.gif0Embedded OLE package script
    • http://csc3-2010-crl.verisign.com/CSC3-2010.crl0DIn document text (OLE body)
    • http://csc3-2010-aia.verisign.com/CSC3-2010.cer0In document text (OLE body)
    • http://crl.verisign.com/ThawteTimestampingCA.crl0In document text (OLE body)
    • http://crl.verisign.com/tss-ca.crl0In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)
    • https://www.verisign.com/cps0Embedded OLE package script

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_office_000402eb.exe embedded-pe Office MZ+PE at offset 0x402EB 152341 bytes
SHA-256: ef48ec71cce3b77f8b595ddf5fea1da05ba082b6d7817e73c4dc2f8873fde053
ole10native_00.bin ole-package OLE Ole10Native stream: ObjectPool/_1400246196/Ole10Native 558 bytes
SHA-256: 620f07455c5f156733dc9f164ed62f45e122f8992192aaf515800110e487baf4
ole10native_01.bin ole-package OLE Ole10Native stream: ObjectPool/_1400246197/Ole10Native 138707 bytes
SHA-256: bb1475682635e5137b6bf1b1edd98d5f30e1eb8af24808e07eff4aa68410c2e8

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