Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 ca59007ca762bd4d…

MALICIOUS

RTF / .DOC

579.9 KB Created: 2021-10-07 23:37:00
MD5: 3e579ad35aee12b59671fd1e94913f7f SHA-1: 99b4d17c746af382de55ee12d4c7d53c2f467d49 SHA-256: ca59007ca762bd4d63abd8f784cd731dd3022f43896f78d939f59e84cc8232bf
222 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The RTF file contains multiple indicators of OLE object manipulation, including embedded and automatically linked objects with update triggers. The critical heuristic firing for CVE-2017-8759 strongly suggests exploitation of this vulnerability through MSXML SAX OLE activation. This indicates the file is designed to deliver a malicious payload by leveraging this known exploit. No document body or script content was available for further analysis.

Heuristics 7

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 3 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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/word/2003/wordml}}\paperw12240\paperh15840\margl900\margr1720\margt1020\margb280\gutter0\ltrsect

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000145c7.bin
a73c67b3c2794f60d06c91b16b0f02099ffaea8f3d3fd27ec8d95f2d73f22c06		 rtf-objdata-decoded RTF \objdata at offset 0x145C7 154323 bytes
objdata_01_off00062c48.bin
9d9bc825f2fa5e0ed8db7dce6823e199ad9c775873472d42887214589f205470		 rtf-objdata-decoded RTF \objdata at offset 0x62C48 2632 bytes
objdata_02_off000641eb.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0x641EB 12297 bytes

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