Malicious RTF — malware analysis report

Static analysis result for SHA-256 ab173d6a02b452b0…

MALICIOUS

RTF

50.6 KB Created: 2018-04-14 13:25:00 First seen: 2019-01-12
MD5: c65bbf180a4e67ff9a79c83dd5da717a SHA-1: d2c628559d5fd52336dfbf59f334ffecf4abbca6 SHA-256: ab173d6a02b452b00242d675a53ba772658927776cc5f31514c48b6b8e0a8e1b
282 Risk Score

Malware Insights

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

The RTF file exploits CVE-2017-0199, a known vulnerability in Microsoft Office that allows for remote code execution via OLE object activation. The embedded URL http://185.154.15.15/1.bmp is used to fetch a secondary payload. The document body text appears to be a request for tax-related information, potentially a lure.

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 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://185.154.15.15/1.bmp 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_off000036db.bin rtf-objdata-decoded RTF \objdata at offset 0x36DB 3202 bytes
SHA-256: e31ae46139ee891727f9b020d2fd44a828883f0b5ee65449cb78f20436f864ad

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