Malicious RTF — malware analysis report

Static analysis result for SHA-256 1913672139aa4ba9…

MALICIOUS

RTF

5.6 KB First seen: 2017-12-09
MD5: 670bb32c855c6d315cd9b8fb2deb2c27 SHA-1: 13240706a9b74e3feb48cf378daecc61809f5b04 SHA-256: 1913672139aa4ba994b6bcdc319a4b811276e3851e013b8fe77f9003b7fd6739
222 Risk Score

Malware Insights

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

The RTF file contains OLE object data that is automatically linked and updated, indicating an attempt to fetch external content. Specifically, the heuristic firings and the embedded URL point to the exploitation of CVE-2017-0199, which is known to download and execute a secondary payload from a remote URL. The URL http://connardkfjek.net/hohoho.jpg is highly suspicious and likely hosts the next stage of the attack.

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://connardkfjek.net/hohoho.jpg 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: 11e154fa4c1b2dcd8059860ff9d36d62bbd301c922f711b47580c60a21a0c38c

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