Malicious RTF — malware analysis report

Static analysis result for SHA-256 caa8f1bae38ef9cc…

MALICIOUS

RTF

387.0 KB Created: 2020-04-26 16:13:00 First seen: 2020-08-25
MD5: 64df63c9caeac7274674a63d6a43c332 SHA-1: 87b30c3cdb21de1ac4916de2fad46a3b586d2151 SHA-256: caa8f1bae38ef9ccf79a6ccfa4d184894dd1ac554d910fcc5730d25d27234734
142 Risk Score

Malware Insights

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

The RTF file contains multiple OLE objects and uses \objupdate to force their activation, which is a known technique for exploiting vulnerabilities. The critical heuristic firing for CVE-2017-8759 indicates that this specific vulnerability is being targeted for client execution. No document body text or scripts were extracted, but the OLE object activation strongly suggests a malicious payload delivery.

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 5 \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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002ce4.bin rtf-objdata-decoded RTF \objdata at offset 0x2CE4 26171 bytes
SHA-256: 1bb298750a646dc37a6bafb64cbbdbd093872ee2928fbe4ce81b737858e27443
objdata_01_off000141db.bin rtf-objdata-decoded RTF \objdata at offset 0x141DB 26171 bytes
SHA-256: df3d80d7ea55ccd7a3fd3022b0bf157b362ac0a7b748f5bb7507f0156b58942d
objdata_02_off000256d2.bin rtf-objdata-decoded RTF \objdata at offset 0x256D2 26171 bytes
SHA-256: 07b8594a6ea2f86a977c7e3ee0e05a75ef14c29e750d21d2e0630a33b83e984d
objdata_03_off00036bc9.bin rtf-objdata-decoded RTF \objdata at offset 0x36BC9 26171 bytes
SHA-256: ecd0994cc837ea03ad316680ce55c3e3ac274356fe533b667909fdebb6917b21
objdata_04_off000480c0.bin rtf-objdata-decoded RTF \objdata at offset 0x480C0 26171 bytes
SHA-256: 7be3fd62cc0ec4a03fe6bac302d2021353771a9a8768799475beb10ddd142a52

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