Malicious RTF — malware analysis report

Static analysis result for SHA-256 f9b818468eb32853…

MALICIOUS

RTF

194.8 KB Created: 2018-06-09 06:44:00 First seen: 2019-05-16
MD5: 6846f8878c8b40c100683d479cd5c57c SHA-1: 43798901d55f72d25fd50980df370deeb4475656 SHA-256: f9b818468eb3285303bfc8a9bbdbdbadc62326723fe74eeb03d6ba21f9247508
182 Risk Score

Malware Insights

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

The RTF file contains an OLE object that leverages CVE-2017-0199 to fetch a payload from the URL https://master.tus.io/files/b2403e5def5066ae87e318854cda9676. This indicates a likely spearphishing attachment used to deliver a second-stage exploit or malware. The ClamAV detection further confirms the malicious nature of the file.

Heuristics 5

  • 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.
  • 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 https://master.tus.io/files/b2403e5def5066ae87e318854cda9676 In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000029d6.bin rtf-objdata-decoded RTF \objdata at offset 0x29D6 3113 bytes
SHA-256: 7ac5e99d0f54fd8f8793cbcd348dcc66f2dc414d2841d44ddb2354342928b027

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