Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b7f41748ded84d81…

MALICIOUS

RTF / .DOC

1.50 MB Created: 2019-09-17 13:59:00
MD5: 6470ab42b2f6fc3e4aa5ecbc29198e10 SHA-1: f8a7e710cbc05cb946b5a8f17199b64638cba8b8 SHA-256: b7f41748ded84d81023e813947c6b10b45b6590277edf90dd898bed0037235ab
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1027 Obfuscated Files or Information

The file is an RTF document containing an embedded OLE object, specifically triggering the Equation Editor vulnerability (CVE-2017-8759). This indicates an attempt to exploit a known vulnerability for code execution. The presence of ` tf_objdata` and ` tf_objupdate` further supports the exploitation of embedded objects. While no specific malware family is identified, the attack pattern is consistent with exploiting document vulnerabilities to deliver a payload.

Heuristics 6

  • 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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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 1 \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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00177234.bin
d30cd57fe5b45dda8547c3e7eb741c6c94619a8ed90098281f8d47befca2413a		 rtf-objdata-decoded RTF \objdata at offset 0x177234 3739 bytes

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