Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 f9fdb0d3bdfc7e53…

MALICIOUS

Office (OLE) / .DOC

612.5 KB Created: 2021-08-18 09:45:00 Authoring application: Microsoft Office Word
MD5: 877860610fc42b1b257a6190a8c83b11 SHA-1: ce480630cfd1bf1249ba3921ccec1039ddfa69cc SHA-256: f9fdb0d3bdfc7e5305bc9444c832a8900a77006ff54a2660c973fec4afa4ab60
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a Microsoft Word document containing VBA macros, specifically a Document_Open macro. This macro appears to be designed to download and execute a second-stage payload. The script attempts to write to the registry key HKCU\Software\Microsoft\Office\Word\Security\VBAWarnings, likely to disable security warnings for future macro execution. The presence of the Document_Open macro and the suspicious registry write strongly indicate a malicious intent to bypass security measures and execute further malicious code.

Heuristics 5

  • Office EPRINT stream contains EMF object high CVE related OLE_EPRINT_EMF_OBJECT
    OLE ObjectPool contains an EPRINT stream with EMF data. This is rare in normal documents and is CVE-2007-3893/MS07-046-family evidence when paired with Office exploit payload anomalies, but the malformed EMF record is not proven by this rule alone.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://schemas.microsoft.com/office/2006/encryption
    • http://schemas.microsoft.com/office/2006/keyEncryptor/password
    • http://schemas.microsoft.com/office/2006/keyEncryptor/certificate
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
614d0a73806e7ab3fc5c84257cbd07da19d41c3036ddfad266f0e2f87094a5b4		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2723 bytes
ole10native_00.bin
5767117a1743e860dd880afe253c86dced74cf015641482957a69c6278a48e51		 ole-package OLE Ole10Native stream: ObjectPool/_1690759731/Ole10Native 444719 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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