Malicious RTF — malware analysis report

Static analysis result for SHA-256 a51edff866bb8c70…

MALICIOUS

RTF

1.72 MB Created: 2019-09-17 13:59:00 First seen: 2020-09-07
MD5: 473bc8775281d956f9a394743285feed SHA-1: f2a579995752887b397feeca9a2d9892f91de209 SHA-256: a51edff866bb8c70bf12c458648be734d13949feb0b0a339de6b30217a45f68f
142 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 configured to update upon activation, leveraging the CVE-2017-8759 vulnerability. This indicates an attempt to execute arbitrary code, likely to download and run a secondary payload. The presence of the ".objdata" and ".objemb" heuristics further supports the exploitation of embedded objects.

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_off001a74da.bin rtf-objdata-decoded RTF \objdata at offset 0x1A74DA 1413 bytes
SHA-256: 0e4241dddbdd8aaa7a1a5bfb793cf31f5e9df0b02800787eb0474312ffe62f15

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