Rtf.Dropper.Agent-7194823-0 — RTF malware analysis

Static analysis result for SHA-256 c35eb828a34b2789…

MALICIOUS

RTF

552.4 KB Created: 2019-09-19 23:26:00 First seen: 2019-11-20
MD5: 5f56c39452f2bd1f72419cfea534056f SHA-1: 26ebe1a617593cbccbd962985984b60d291937a3 SHA-256: c35eb828a34b278988d6d55378b3867d96936d0751ca311ef1a4276185ccee9f
222 Risk Score

Malware Insights

Rtf.Dropper.Agent-7194823-0 · confidence 95%

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

The RTF file contains an embedded OLE object that is forced to activate via \objupdate, exploiting CVE-2017-8759. This technique is commonly used by droppers to download and execute further malicious content. The ClamAV detection name 'Rtf.Dropper.Agent-7194823-0' further supports this assessment.

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.Dropper.Agent-7194823-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7194823-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • \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://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab 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_off00002f19.bin rtf-objdata-decoded RTF \objdata at offset 0x2F19 59526 bytes
SHA-256: fc0211636ee18589ed321faf1d203e0ea47ae80b7f68d16927524a247adca3d5

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