Malicious RTF — malware analysis report

Static analysis result for SHA-256 6acf3366d65c2244…

MALICIOUS

RTF

5.6 KB First seen: 2018-03-04
MD5: 6c7681c2936ab7c9fae2d3ffbd863ada SHA-1: 6fcd9bf02b5f238342daecb1dbab5219924b5baa SHA-256: 6acf3366d65c2244707eb3cdcc6ae2efcbb487bd41be7742152e41ef31def310
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 configured to automatically update and activate an OLE object. This behavior is indicative of an exploit for CVE-2017-0199, which is designed to download and execute a remote file. The embedded URL 'http://192.168.96.128/logo.doc' is the target for this exploit, likely serving as a secondary 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://192.168.96.128/logo.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_off000001a2.bin rtf-objdata-decoded RTF \objdata at offset 0x1A2 2601 bytes
SHA-256: 0673ebde612ccfbf6c9cf471f2bb62e99509ff1a2e5ad374e1dc1bac0f57f61b

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