Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e33c87beec2f9856…

MALICIOUS

RTF / .DOC

1.14 MB Created: 2019-09-17 13:59:00
MD5: e4a5e953841f2f5c61b373dd2a4494e9 SHA-1: 1dec8d12cac28ab21f1f470f179de4046e41bb2e SHA-256: e33c87beec2f985630825a38da83fefa75e3ce178e2a702d4f419cf32f99450e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document that leverages the Equation Editor component, specifically targeting CVE-2017-8759. This indicates an attempt to exploit a vulnerability for code execution. The presence of OLE object data and the ".objupdate" directive further support the exploitation of embedded objects. No specific malware family could be identified, but the attack pattern is consistent with exploiting known vulnerabilities in Microsoft Office components.

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_off00119547.bin
1a868e64b4dd2dae98b6e36faba82e7b57a4756fb6a4a8e385533e4a4dad33da		 rtf-objdata-decoded RTF \objdata at offset 0x119547 3739 bytes

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