Malicious RTF — malware analysis report

Static analysis result for SHA-256 350c55c5dfc91abb…

MALICIOUS

RTF

253.1 KB Created: 2017-09-14 04:13:00 First seen: 2017-10-10
MD5: 1a534e46eab47a71be1205fdff8160a7 SHA-1: a4a9129d5b10b33e46ebb9c4593c6a80641cbf3a SHA-256: 350c55c5dfc91abb2e09982f3ec00f26e71406b52bc8981abdc33c31ff87238c
282 Risk Score

Malware Insights

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

The RTF file exploits CVE-2017-0199, a known vulnerability in Microsoft Office that allows for remote code execution via OLE object linking. The embedded URL points to a malicious DOCX file, indicating the RTF serves as a dropper for a secondary payload. The exploit targets MSXML SAX OLE activation, leading to the download and execution of the linked document.

Heuristics 7

  • 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.
  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 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.microsof In RTF body
    • https://a.safe.moe/ypU82.docxIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002a0f.bin rtf-objdata-decoded RTF \objdata at offset 0x2A0F 2601 bytes
SHA-256: 5e5b5e5f0ad553540c58d6e9554dca5fed4fe16c5438b7959cffc08936c2e901

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