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

Static analysis result for SHA-256 a88ddde35e29a101…

MALICIOUS

Office (OLE) / .DOC

857.5 KB Created: 2021-10-05 13:49:00 Authoring application: Microsoft Office Word
MD5: be65a6bd5972d02f2d1442000eb382c2 SHA-1: 40f57a8974ad25069a2e1a9c52e48af2bc8e5e4c SHA-256: a88ddde35e29a1019aba1165021748719d4df56c0c9d245dee3e88476bad3998
104 Risk Score

Malware Insights

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

The sample is a malicious OLE document containing a VBA macro that executes upon opening. The Document_Open macro attempts to locate a file named 'zoro.kl' and execute it. It also appears to establish persistence by writing to the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy. The macro's password for opening a document is 'doyouknowthatthegodsofde'. The macro's obfuscation and the lack of clear network indicators prevent a higher confidence score.

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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