Malicious RTF — malware analysis report

Static analysis result for SHA-256 90d4af9813a7b1fa…

MALICIOUS

RTF

261.9 KB Created: 2019-09-17 13:59:00 First seen: 2020-07-24
MD5: dee047bf8c8829625534e3b7ae8d0832 SHA-1: 22e5a4b9238774463479ac0cbfd5e7995cb3f632 SHA-256: 90d4af9813a7b1fa8edbbb4085b1d7a506fc83602ab86503d1403d918b8cb74a
142 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects and triggers an ".objupdate" command, which is indicative of exploiting CVE-2017-8759 for client execution. The embedded URL, although benign, is present within the RTF body. The primary attack vector appears to be the exploitation of a known vulnerability to facilitate the execution of a secondary payload.

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_off0003c26c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C26C 1414 bytes
SHA-256: 0174c5a2aeb66cda5dc2f25a6c502c83725dc9f2bdf53bdf8576d872480ec506

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