Malicious RTF — malware analysis report

Static analysis result for SHA-256 24ae9dd48e7f7f42…

MALICIOUS

RTF

53.5 KB Created: 2018-03-27 14:56:00 First seen: 2019-05-31
MD5: f6e72237ec145e274b12a0c10fe3796f SHA-1: 80dea55e9818c080577f65295d5eb4b1db7a269f SHA-256: 24ae9dd48e7f7f42559507b50673cf0a9cbf277e66f00acb0999248ef6c025fc
282 Risk Score

Malware Insights

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

The RTF document exploits CVE-2017-0199, a known vulnerability in MSXML, to activate an OLE object. This object is configured to automatically update and download a secondary RTF file from 'http://goodel.ddns.net/a.rtf'. The embedded document body suggests a lure for information gathering, likely to trick the user into providing sensitive details. The primary IOC is the URL used to fetch the next stage payload.

Heuristics 7

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • 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 2 \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://schemas.microsoft.com/office/word In RTF body
    • http://goodel.ddns.net/a.rtfIn RTF body
    • http://goodel.ddns.net/b.rtfIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00003269.bin rtf-objdata-decoded RTF \objdata at offset 0x3269 3202 bytes
SHA-256: f1b63ce881268c5493584c3d931447f0b6fd81b49e9a9cdfe93fbb117fbd698a
objdata_01_off00005600.bin rtf-objdata-decoded RTF \objdata at offset 0x5600 3202 bytes
SHA-256: 96b547e39970456bfa786863c7c7b8990accd26bcc25e1e5a23e0891f1dfaa1f

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