Rtf.Dropper.Agent-7653936-0 — RTF malware analysis

Static analysis result for SHA-256 aff6a81368187f61…

MALICIOUS

RTF

1.92 MB Created: 2019-09-17 13:59:00 First seen: 2020-05-25
MD5: 90b2a72c773ccde04dc1d760f8f0d06f SHA-1: 3c6b03816f2a453e9896ff0b1e2bacf68e1be882 SHA-256: aff6a81368187f6147fa6cee271bf5cde31d9aa331c970bdab90cc78b9349e78
202 Risk Score

Malware Insights

Rtf.Dropper.Agent-7653936-0 · confidence 95%

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

The sample is an RTF document that contains embedded OLE objects, with heuristics indicating the exploitation of CVE-2017-8759 for OLE activation. This suggests the document is designed to execute arbitrary code upon opening, likely to download and run a secondary payload. The ClamAV detection name 'Rtf.Dropper.Agent-7653936-0' further supports its function as a dropper.

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-7653936-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7653936-0
  • \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_off001de1fb.bin rtf-objdata-decoded RTF \objdata at offset 0x1DE1FB 1413 bytes
SHA-256: cd2364b89ca55e2b9ea2205f16d8fbbff9c90079b7373f7a920f4fa83d6cbcff

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