Malicious RTF — malware analysis report

Static analysis result for SHA-256 2f2375e9322c5ffb…

MALICIOUS

RTF

1.75 MB Created: 2019-09-17 13:59:00 First seen: 2020-05-25
MD5: b8e6ee6bbbda269f257203f298b803bf SHA-1: ba853b490732600af7da451331a7c800599d5d70 SHA-256: 2f2375e9322c5ffbf8b8da68489e3c209ae3c00a0143af672e279e3d7d0d547e
150 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that is forced to activate via \objupdate, exploiting CVE-2017-8759. This indicates an attempt to execute arbitrary code. The presence of a download button lure suggests the document's purpose is to trick the user into downloading a malicious payload.

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.
  • \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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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_off001ad004.bin rtf-objdata-decoded RTF \objdata at offset 0x1AD004 1413 bytes
SHA-256: 131162797b8a96b8346d25b63c91cd3781aa40b6415b741deee6eeaae4246d1a

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