Malicious RTF — malware analysis report

Static analysis result for SHA-256 5daa2e582b7283f9…

MALICIOUS

RTF

191.3 KB Created: 2019-09-17 13:59:00 First seen: 2019-12-09
MD5: adbffb78a86751663a00a2879db6c42d SHA-1: 6f893a216994da8369418a995445e9d059798da2 SHA-256: 5daa2e582b7283f9d02b9c1dbf6b986b66643e397dd9aa1dda2e60f6745fbeae
142 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE objects that are triggered via \objupdate, leading to the exploitation of CVE-2017-8759. This vulnerability allows for the activation of MSXML SAX OLE objects, which can lead to arbitrary code execution. The document body is heavily obfuscated and does not provide clear textual lures.

Heuristics 5

  • 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.
  • \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 In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0001f3bd.bin rtf-objdata-decoded RTF \objdata at offset 0x1F3BD 25620 bytes
SHA-256: 42d4eb6057e288e681aec0c658ccd29c89b805ff9f7a73a24a1acdbacb8a63ba

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