Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 7884d824601d767b…

MALICIOUS

RTF / .DOC

1.76 MB Created: 2019-09-17 13:59:00
MD5: b027737346e26ad9a988408e619a16c5 SHA-1: 9039941e3acf1b5ae08c57e199cd97feaaa23ceb SHA-256: 7884d824601d767b0ab4c2a88fd0c3d5d9171eb085f4c3194e125dc9120bc3a0
202 Risk Score

Malware Insights

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

The file is an RTF document containing an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-8759). This exploit allows for the execution of arbitrary code, which is a common technique for downloading and executing further malicious content. The presence of the ".objupdate" directive further confirms the intent to activate the embedded object.

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_off001b730a.bin
3522a4602019c31dbcab6d22f1bc4136ac3ff258f91c9bf0bafae48bff1b33d9		 rtf-objdata-decoded RTF \objdata at offset 0x1B730A 3669 bytes

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