Malicious RTF — malware analysis report

Static analysis result for SHA-256 4a54a2dc7f5dc4fa…

MALICIOUS

RTF

5.6 KB First seen: 2017-10-28
MD5: 04a202cd5e64e5337c845a454d4a8a81 SHA-1: 3f761350c9d1cb48ff6423c440587fb88c098221 SHA-256: 4a54a2dc7f5dc4fa2b94e11d9df0d89160acbb51ca522be034faff94ef1cb560
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 CVE-2017-0199 exploitation. This vulnerability is used to automatically link and update an OLE object, which in this case is configured to download a payload from the URL https://failiem.lv/down.php?i=cyffwwvu. The file is detected by ClamAV as Rtf.Exploit.CVE_2017_0199-6335035-0, indicating a high likelihood of malicious intent.

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://schemas.microsoft.com/office/word/2003/wordml In RTF body
    • https://failiem.lv/down.php?i=cyffwwvuIn 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: e2ea34f86c14b42bd4169be1ab94fbd5db1623940272e428b2795dde188abe11

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