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

Static analysis result for SHA-256 826972be9ee89c7c…

MALICIOUS

Office (OLE) / .DOC

857.5 KB Created: 2021-10-05 13:48:00 Authoring application: Microsoft Office Word
MD5: c7f5482e51ef355a25bf810efdb3ec0a SHA-1: cb20b13c5761d95236520297473f1ecf49b74230 SHA-256: 826972be9ee89c7ca3eec2722df35796e662578b0c070e17bf58e4853f256151
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro that executes upon opening. The macro searches for a file named 'zoro.kl' and attempts to execute it. It also appears to write to a Run key, likely for persistence. The macro's logic for searching and executing files, along with the embedded password, suggests a downloader or dropper functionality.

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
4b4d165f838373d82956ea57a25034d84ac153ba8b2074181d6c5a1be9fa8daf		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3750 bytes
ole10native_00.bin
2d00befb3e7c6aa3ff7ad34b4eeef23517e793cfd7f765501619ad77505abeae		 ole-package OLE Ole10Native stream: ObjectPool/_1694918961/Ole10Native 238886 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.97, consistent with packed or encrypted content.

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