Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 febf5501bdb69d24…

MALICIOUS

RTF / .DOC

2.37 MB Created: 2019-09-17 13:59:00
MD5: 2ecb20db770d3632f9eea6dc54dba6c0 SHA-1: 4126f3f468202a2e97ad89dc7a0b854588c57226 SHA-256: febf5501bdb69d249d9a42ec317cee920ebe9c3c0cccc8303b962966c965c3ed
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell T1204.002 User Execution: Malicious File

The critical heuristic firings for RTF_EQUATION_EDITOR and CVE_2017_8759 indicate exploitation of the Equation Editor vulnerability. The RTF_OBJDATA and RTF_OBJUPDATE heuristics suggest the embedding and activation of an OLE object, which is the mechanism for this exploit. The presence of an embedded OLE object further supports this 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_off0024b2cf.bin
2d2432174716ff35bbc0e94634f84947209ec8080c6c12836a2b1a506c293d61		 rtf-objdata-decoded RTF \objdata at offset 0x24B2CF 3732 bytes

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