Malicious RTF — malware analysis report

Static analysis result for SHA-256 41c84d1fec1dc790…

MALICIOUS

RTF

161.4 KB Created: 2017-12-20 16:37:00 First seen: 2017-12-24
MD5: 0376608d07ecd8d132a96cabac5ed80d SHA-1: ae4d3e5405483367b12cb121021d85cce0543a06 SHA-256: 41c84d1fec1dc7902fecbbb7200d8ee4b4c43be16543d6b622499436ce9b8de2
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 is automatically linked and updated, triggering an exploit for CVE-2017-0199. This exploit attempts to download and execute a payload from the URL http://10.2.78.69:80/default.hta. The document body discusses computer virus prevention, which may serve as a lure.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / weaponized URL) critical CVE exact CVE_2017_0199_WEAPONIZED_URL
    RTF contains a URL Moniker OLE link to a script/HTA/template-style remote loader, matching the tighter static CVE-2017-0199 shape.
  • 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://10.2.78.69:80/default.hta 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_off000270d4.bin rtf-objdata-decoded RTF \objdata at offset 0x270D4 2601 bytes
SHA-256: e1579d33bc89aca9b97d843f90620374b9e95d5ddb3da2688e2a36a17810130e

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