Malicious RTF — malware analysis report

Static analysis result for SHA-256 2224702a71ea23ae…

MALICIOUS

RTF

5.6 KB First seen: 2019-03-10
MD5: 9c9578df333d165f5656a40563f1079e SHA-1: 19ed054bd63ed3732e0d4317a7e9f0aafbb80d2f SHA-256: 2224702a71ea23ae6905d03859fbf9cc897f3fb9a91afe7eb1ff97b617ae5b6e
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object with an automatically linked and updating object, indicative of an exploit. Specifically, the CVE-2017-0199 exploit is detected, which leverages a weaponized URL to download a secondary payload. The embedded URL http://178.63.122.20/~dave/2_com/2/nnams.hta is highly suspicious and likely serves as the initial stage for delivering further malicious content.

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://178.63.122.20/~dave/2_com/2/nnams.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_off000001ab.bin rtf-objdata-decoded RTF \objdata at offset 0x1AB 2601 bytes
SHA-256: cca58224f499c5dd5e9103704e17e299fdea36e8f50aa692b000da5ecea87824

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