Malicious RTF — malware analysis report

Static analysis result for SHA-256 590ffaeb50d4cb4a…

MALICIOUS

RTF

5.5 KB First seen: 2019-05-16
MD5: ab1205c7f44243f6129339fbd987428a SHA-1: 150a1d13c5de11892537337f6cfdf4aa6f59ba0c SHA-256: 590ffaeb50d4cb4a2e8ffdd18312acb31fac403695812c8a6df4c729aaee8777
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, exploiting CVE-2017-0199. This exploit is designed to download and execute a remote document from the URL http://172.17.0.100/top_animes.doc, indicating a likely initial access vector via spearphishing.

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://172.17.0.100/top_animes.doc 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_off0000014b.bin rtf-objdata-decoded RTF \objdata at offset 0x14B 2601 bytes
SHA-256: ef90751fc0de583a5eae234525e106fc72509f5214c1d4ead84fc06fbe47430a

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