Malicious RTF — malware analysis report

Static analysis result for SHA-256 5efc2bc756304e0c…

MALICIOUS

RTF

46.7 KB Created: 2019-02-10 23:06:00 First seen: 2019-10-01
MD5: ecbc27632cec6670288489a37fee5df9 SHA-1: 5ee531c5b8e1ea1af1115212e78581832c1ed8b4 SHA-256: 5efc2bc756304e0c2298931ceac585dec78f76e8ff2b79641fc3ec93bf87253b
182 Risk Score

Malware Insights

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

The RTF file contains an OLE object that leverages CVE-2017-0199 to fetch content from the URL https://yandex.ru/collections/card/5c37bee0c9dc700043052c92/. This technique is commonly used to download and execute malicious second-stage payloads. The presence of the OLE object data and the specific CVE exploit firing strongly indicate malicious intent.

Heuristics 5

  • 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.
  • 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://yandex.ru/collections/card/5c37bee0c9dc700043052c92/In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002d63.bin rtf-objdata-decoded RTF \objdata at offset 0x2D63 3714 bytes
SHA-256: 9d8be9d60c12a0f4d7fa116881351d5ec562fdd1243e2117bd6a8f25b7f42528

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