Malicious RTF — malware analysis report

Static analysis result for SHA-256 5b301bed798e3e79…

MALICIOUS

RTF

5.6 KB First seen: 2017-12-24
MD5: 6d977c943a9b6a1f60340f3caed0b051 SHA-1: cc71302ab1ca37e0b8fcf9240926fbea51eb16cb SHA-256: 5b301bed798e3e79bf1ed829ed4ceb60257887344f9f8ad3dd591a82a39bc4a8
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object that is automatically linked and updated, triggering an exploit for CVE-2017-0199. This exploit is designed to download and execute a remote payload from the specified URL. The embedded URL 'http://192.168.2.108/aufnahme.pdf' is the primary indicator of the secondary stage.

Heuristics 6

  • 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://192.168.2.108/aufnahme.pdf 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_off000001a2.bin rtf-objdata-decoded RTF \objdata at offset 0x1A2 2601 bytes
SHA-256: e015663bd9a01dafa17d1e011cdfbfe4aa2315d49f78988ded9dcd4f7d23e808

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