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

Static analysis result for SHA-256 8733e81f7ef203f4…

MALICIOUS

Office (OLE) / .DOC

805.0 KB Created: 2021-09-29 09:44:00
MD5: 0fe8ca5d6100d9a3b6fa3a1512e091be SHA-1: 735e99aff2e46da0a9e4f158e9b83e3be4083fee SHA-256: 8733e81f7ef203f4d1c4208b75c6ab2548259cc35d68df10ebf23a31e777871b
104 Risk Score

Malware Insights

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

The sample contains a VBA macro that executes upon opening the document, as indicated by the Document_Open heuristic. The macro attempts to create a file named 'zoro.doc' in the user's template directory and opens it with a hardcoded password. The macro's functionality is partially obfuscated, but it appears to be designed to download and execute a secondary payload. The presence of the Document_Open macro and the attempt to create and open a new document strongly suggest a malicious intent to deliver further 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
0c3c9b8f5ce9862db8def707cb36b6b0d9e57b823687745ee752b7cc45e5e80d
vba-macro oletools.olevba.extract_macros (decoded VBA source) 3283 bytes
ole10native_00.bin
ba5cf57e4f9f250569935c1031bae5fb16c6867b3ec9c63ae7b695066320f964
ole-package OLE Ole10Native stream: ObjectPool/_1694388549/Ole10Native 190246 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.97, consistent with packed or encrypted content.