Malicious RTF — malware analysis report

Static analysis result for SHA-256 e2474476fd6ba8cf…

MALICIOUS

RTF

5.6 KB First seen: 2017-08-27
MD5: 15987d26c11ca22d8ab2729dad23da31 SHA-1: bc98493c7508b5afbb7d784691c2dc91560e6730 SHA-256: e2474476fd6ba8cfa35b59c482c714e09871037835e0b631c17e55be0b4ba8c6
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an OLE object that leverages CVE-2017-0199 to automatically link to and update from a remote URL. This exploit is known to download and execute a second-stage payload, likely from the provided URL http://10.88.2.241:8080//. The file's structure and the specific heuristic firings strongly indicate this exploit attempt.

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://10.88.2.241:8080// 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_off000001b4.bin rtf-objdata-decoded RTF \objdata at offset 0x1B4 2601 bytes
SHA-256: d8b73162ada67ecbbbc5328fd73826d02d1363e5381ccc97f4c757c16fa00af1

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