Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 aabeb16669bb930f…

MALICIOUS

RTF / .DOC

1.53 MB Created: 2019-09-17 13:59:00
MD5: bcd10dd52cb3d40cae7e4f15fc0065cc SHA-1: e74859eb1312095f0f4101d60a5f45b3a8a0d062 SHA-256: aabeb16669bb930f699be4b3a0bddca7f1f6536e1938c0abf4eae11ecfcefd46
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing an embedded OLE object that leverages the Equation Editor. Critical heuristics indicate exploitation of CVE-2017-8759, a known vulnerability in MSXML SAX, which allows for arbitrary code execution. The RTF structure with embedded objects and the specific CVE exploited strongly suggest a malicious document designed 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_off00167847.bin
6481658092582401512f5024d43d4f06e511691ac0018e5cebc2d0cc02885d1f		 rtf-objdata-decoded RTF \objdata at offset 0x167847 3732 bytes

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