Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8c8d5579e950af90…

MALICIOUS

Office (OLE)

123.0 KB Created: 2018-04-02 21:09:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 77435775d6cff9a391a615497c89d2a1 SHA-1: b8147e95d5571243e4c86925f17e6d1f86123796 SHA-256: 8c8d5579e950af90fdad66438c85a198335b4802328c4c1403811c9b883dfb28
282 Risk Score

Malware Insights

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

The file is a malicious Microsoft Word document that exploits CVE-2007-3899, a memory corruption vulnerability. It contains an embedded OLE package (ole10native_00.bin) which is likely a second-stage payload, indicated by the 'OFFICE_PACKAGE_RISKY_FILE' heuristic. The presence of WinExec and VirtualAlloc API references further supports the execution of malicious code. The document body is a benign-looking statute, suggesting a lure.

Heuristics 7

  • 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.
  • ClamAV: Doc.Dropper.Agent-6503792-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6503792-0
  • 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 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.copel.br In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ole10native_00.bin ole-package OLE Ole10Native stream: ObjectPool/_2147483647/Ole10Native 41580 bytes
SHA-256: ca263c37f3295502685c48146c42c06bdced80c179431f93a43153efc6e51c63

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