Rtf.Dropper.Agent-8728388-0 — RTF malware analysis

Static analysis result for SHA-256 5fbc3560a1bd2190…

MALICIOUS

RTF

1.57 MB Created: 2019-09-17 13:59:00 First seen: 2020-07-24
MD5: 5d0e5f500d80ea023fc2e117e69f9a4f SHA-1: 7ef08736f41aad919edb771e74e28df5b673825b SHA-256: 5fbc3560a1bd21904d0246851b7a016c8ac666ab1ac31b34245d6a4bce5670f3
202 Risk Score

Malware Insights

Rtf.Dropper.Agent-8728388-0 · confidence 95%

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

The RTF file contains embedded OLE objects and triggers the ".objupdate" field, which is indicative of exploitation for client execution via CVE-2017-8759. ClamAV identifies the file as Rtf.Dropper.Agent-8728388-0, suggesting its purpose is to drop and execute a secondary payload. The embedded URL, though benign, is part of the RTF structure.

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-8728388-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-8728388-0
  • \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 OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off001837d1.bin rtf-objdata-decoded RTF \objdata at offset 0x1837D1 1414 bytes
SHA-256: c2b5bbb397f0a35c89a73210480fa861393c839db7e22ed90869132ff068cbf3

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