Malicious RTF — malware analysis report

Static analysis result for SHA-256 81811d2152722893…

MALICIOUS

RTF

5.6 KB First seen: 2017-12-24
MD5: 211921a23c9adf21a4a698136689cbb5 SHA-1: 9eeb4cebb999c6e92e258171bbdbb4aa0fe91033 SHA-256: 81811d215272289319507b41add8bcb5e7a74d19b5c3321dcb0d765672a38fde
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 component, indicative of an exploit. Specifically, the CVE-2017-0199 vulnerability is leveraged to fetch and execute a payload from the URL http://192.168.1.111:80/default.hta. This exploit pattern is commonly used to deliver secondary malware stages.

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://192.168.1.111:80/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_off000001b4.bin rtf-objdata-decoded RTF \objdata at offset 0x1B4 2601 bytes
SHA-256: a21fc0d150aaec954437db429f7dbcbfd856e4af5d6d73732969834234ea9ec5

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