Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 258e3011b88c6b06…

MALICIOUS

RTF / .DOC

1.63 MB Created: 2019-09-17 13:59:00
MD5: 4457ff9ff7246eb252b232ae1f3109db SHA-1: e43ce3c33c8fd101e6de32dd43331654c52eb242 SHA-256: 258e3011b88c6b0653d96823a8d12cc6d01a8558f16b7dd3fcdec6b536c53a73
200 Risk Score

Malware Insights

MITRE ATT&CK
T1204.001 Malicious Link: Malicious File T1566.001 Phishing: Spearphishing Attachment

The sample is an RTF document containing an embedded OLE object, specifically triggering the CVE-2017-8759 vulnerability related to MSXML SAX OLE activation. This indicates the document is designed to exploit this vulnerability upon opening, likely to download and execute a second-stage payload. No document body text was available for analysis, but the critical heuristic firings strongly suggest a code execution attack vector.

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_off00191b81.bin
21a6121092a623d73af56372a8aaaba9b40281bbec1192344466bb05251486b4		 rtf-objdata-decoded RTF \objdata at offset 0x191B81 3732 bytes

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