Malicious RTF — malware analysis report

Static analysis result for SHA-256 304e41c60d5aaed8…

MALICIOUS

RTF

303.5 KB Created: 2017-11-23 23:42:00 First seen: 2017-12-08
MD5: fa9c961402917b69f10847bea734d379 SHA-1: 950e7ec78c35b4a21fc057507613eff4c33a25bd SHA-256: 304e41c60d5aaed824a2ce0f1e0599a1c2368550043178006da5be33c528a5e1
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains OLE object data and triggers \objupdate, indicating an attempt to activate embedded objects. Critical heuristics identify the exploitation of CVE-2017-8759, a known vulnerability in MSXML SAX OLE activation. The document also includes a remote URL, http://89.248.169.136/exp/t.php?stats=send&thread=0, which is likely used to download a secondary payload. ClamAV detection as Rtf.Downloader.CVE_2017-6336326-3 further confirms its malicious nature as a downloader.

Heuristics 6

  • 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.
  • ClamAV: Rtf.Downloader.CVE_2017-6336326-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Downloader.CVE_2017-6336326-3
  • \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.
  • INCLUDETEXT/INCLUDEPICTURE remote URL high RTF_INCLUDE_REMOTE
    RTF document uses INCLUDETEXT or INCLUDEPICTURE with an http:// URL — Word can fetch the remote content on open depending on Office version and external-content settings, enabling remote template injection, NTLM capture via redirects, or payload delivery
  • 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://89.248.169.136/exp/t.php?stats=send&thread=0 In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000c568.bin rtf-objdata-decoded RTF \objdata at offset 0xC568 2598 bytes
SHA-256: 6efd3e599fe1ca343797afd5ab4054dba3bb9f435caf8fbe4e72fe3fa19b044b
objdata_01_off0000dc96.bin rtf-objdata-decoded RTF \objdata at offset 0xDC96 2674 bytes
SHA-256: b9e8e057ffbc841e3e8f64896edc9522e737e1dd3b1bc371bbf920ed4679a036

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