Malicious RTF — malware analysis report

Static analysis result for SHA-256 9d45b07776018c62…

MALICIOUS

RTF

987.5 KB Created: 2019-09-17 13:59:00 First seen: 2020-07-02
MD5: c83cedbfa351d9fabab523836f12d661 SHA-1: 748cc4d713cd2fcd6f445691d756513a5fb00bb4 SHA-256: 9d45b07776018c62541d967cf176f73f8da64b34c387ed2692b1527e03f6adb5
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 forced to activate via \objupdate, exploiting CVE-2017-8759. This technique is commonly used to download and execute a second-stage payload. While the embedded URL is benign, the exploit itself indicates malicious intent.

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_off000f2b73.bin rtf-objdata-decoded RTF \objdata at offset 0xF2B73 1414 bytes
SHA-256: 060c7ab9333a17685ba3ca3ce32a0d73e44f2e4cb65ead12296970e116678748

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