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

Static analysis result for SHA-256 257d5c61c3d237d3…

MALICIOUS

Office (OLE) / .DOC

431.0 KB Created: 2021-08-30 13:16:00 Authoring application: Microsoft Office Word
MD5: ca29d350e363b21d507ba30cb65413ce SHA-1: 6347d779b014e74d924f03dbd6a3bf2d05fd1c1c SHA-256: 257d5c61c3d237d3246acc02032f7f6f02f80ad9ee26845681c7c6c0c93cb6d2
104 Risk Score

Malware Insights

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

The sample contains a VBA macro that is triggered by the Document_Open event. This macro appears to be designed to drop and execute a secondary payload. The macro attempts to write to the registry key HKCU\Software\Microsoft\Office\Word\Security\VBAWarnings, likely to disable security warnings for future macro execution. The macro's obfuscated nature and the presence of the Document_Open event strongly suggest a malicious intent to download and run additional malware.

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
9f487c36b82e274d38967e56a8d06fd191f49441ba17aa6311c462af13709465		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2955 bytes
ole10native_00.bin
8a693df914d6ee4c5d112146540c1341c281a4de7388eca63d260251a81f558c		 ole-package OLE Ole10Native stream: ObjectPool/_1691808959/Ole10Native 256303 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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