Rtf.Dropper.Agent-7642869-0 — RTF malware analysis

Static analysis result for SHA-256 021b82d7751adfb1…

MALICIOUS

RTF

794.1 KB Created: 2019-09-17 13:59:00 First seen: 2020-06-01
MD5: f3f985d1e230b9c15c6a55580cb29abd SHA-1: 2caf30f2be4127e74509dc8d09a97a147fcf3e47 SHA-256: 021b82d7751adfb1b8e27d091f281691881a2ec9f07b5d321deea9379b3170a3
202 Risk Score

Malware Insights

Rtf.Dropper.Agent-7642869-0 · confidence 95%

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

The RTF file contains an embedded OLE object that is activated via \objupdate, exploiting CVE-2017-8759. This indicates the file is a dropper designed to execute a secondary stage. ClamAV detection confirms this, identifying it as Rtf.Dropper.Agent-7642869-0.

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-7642869-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7642869-0
  • \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_off000bf755.bin rtf-objdata-decoded RTF \objdata at offset 0xBF755 1413 bytes
SHA-256: 54fddcb970f7060b8634ee04a65e2804597b9cfef9ecf2dc2b83d8b97bfc470a

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