Malicious RTF — malware analysis report

Static analysis result for SHA-256 887ba95e2e91606d…

MALICIOUS

RTF

5.7 KB First seen: 2017-12-09
MD5: 7f5071d8efe13e35cb2706197c481efb SHA-1: e869f4d3590ef78b45639a0b1e28b7c6832ed0ae SHA-256: 887ba95e2e91606d59fe10298f0524ab0e0d70124a41224b7cb5244c21d07d1f
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object that exploits CVE-2017-0199, a known vulnerability for remote code execution. The exploit targets a URL that likely serves as a download location for a secondary payload. The presence of ".objupdate" and ".objdata" sections further indicates the embedding of malicious OLE objects designed to trigger the exploit upon opening.

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://rgho.st/download/7vKJpNDrW/a522a339488f8d5bfb96f3e035aa0ce78a11 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 2650 bytes
SHA-256: 76604b27db3865056bb562d75b9c3f64dc13bf92147795cb585b701bf9d76722

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