Malicious RTF — malware analysis report

Static analysis result for SHA-256 0fb787adc05aaec6…

MALICIOUS

RTF

5.6 KB First seen: 2017-08-08
MD5: c4914f7f14efbfdb40f6461a7c943b45 SHA-1: 900029d34aeba7ee8954d7622c59ffabf8002eb3 SHA-256: 0fb787adc05aaec6e4d5056b1ae9a3d137f4e48c058fd73ea0dcab8ac3736360
222 Risk Score

Malware Insights

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

The RTF file contains OLE object data and is flagged for exploiting CVE-2017-0199. This vulnerability is used to automatically link to and update an OLE object from a remote URL, which in this case is http://121.11.12.1/1.png. This indicates the file is designed to download and execute a second-stage payload.

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://121.11.12.1/1.png 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_off000001ab.bin rtf-objdata-decoded RTF \objdata at offset 0x1AB 2601 bytes
SHA-256: 697ea074ef5e545f7f95e6b4d152377de0ab86359f871edc92295220deb25915

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