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

Static analysis result for SHA-256 797fb35ec5ef998f…

MALICIOUS

Office (OLE) / .DOC

623.5 KB Created: 2021-08-19 09:28:00 Authoring application: Microsoft Office Word
MD5: 7b5b74ed8ca5f213d111ec2fced1f446 SHA-1: ba9a35d82106d6c0ce5c50b4861e20c20cacac42 SHA-256: 797fb35ec5ef998f910b1b488a3a394f0d2921e26f1625cd46bfc294800484a4
104 Risk Score

Malware Insights

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

The sample contains a VBA macro that triggers on Document_Open. This macro appears to be designed to download and execute a secondary payload. Specifically, it constructs a path to a file named 'glib.doc' within the user's template directory and attempts to open it if it doesn't exist. The macro also contains obfuscated code that likely handles the download and execution. The presence of the Document_Open macro and the suspicious file path construction strongly suggest a malicious intent to compromise the user's system.

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
bc308138c57d4a6ba0f565bd5b69a35a1cc451a3a034e1f3b14c42e0267e6211		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2795 bytes
ole10native_00.bin
ed56019e82a2755f3ffa14853769db4a78f2cd57161bddabfb79592eb3062d52		 ole-package OLE Ole10Native stream: ObjectPool/_1690845027/Ole10Native 451375 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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