Malicious RTF — malware analysis report

Static analysis result for SHA-256 b4e6d16530e39cae…

MALICIOUS

RTF

171.6 KB Created: 2019-09-17 13:59:00 First seen: 2019-12-10
MD5: 983aeb5f8384a09e9787f3acc96eb696 SHA-1: 29bcdb7a97bb422b3b8480b4f1f810edf7080971 SHA-256: b4e6d16530e39cae6f355a48c9c1388349fc43ccd11ba9c2c7fd9b9c180d1d12
142 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects that are triggered via \objupdate, leading to the exploitation of CVE-2017-8759. This vulnerability allows for the activation of MSXML SAX OLE objects, which can lead to arbitrary code execution. The document body is heavily obfuscated and does not provide clear textual lures.

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_off0001ac9f.bin rtf-objdata-decoded RTF \objdata at offset 0x1AC9F 25542 bytes
SHA-256: dfacc3ea9568538abe5b73d9c393582c6b09240f0c1c1b4d58819c2ed51db17f

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