Rtf.Dropper.Agent-7384550-0 — RTF malware analysis

Static analysis result for SHA-256 9d17e9750ecbd8bc…

MALICIOUS

RTF

719.0 KB Created: 2019-08-22 21:07:00 First seen: 2019-11-20
MD5: 5287c2873d1a28be773a2457b6f1f4c9 SHA-1: 2ab26f82b54ebd841019b6dcc6b92027ae97fd15 SHA-256: 9d17e9750ecbd8bc089a301d2bcbd0f61a21b4e3c2d878585b2f3ae4057fcc3b
202 Risk Score

Malware Insights

Rtf.Dropper.Agent-7384550-0 · 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 technique is commonly used by droppers to download and execute additional malware. ClamAV identified the sample as Rtf.Dropper.Agent-7384550-0, supporting its role 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: Doc.Dropper.Agent-7150573-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7150573-0
  • \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 8 \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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002bb1.bin rtf-objdata-decoded RTF \objdata at offset 0x2BB1 31803 bytes
SHA-256: e550f801bdb19ddea4502f9fe8d774fbf5e5caac37bc859bbeaecca31b8876f5
objdata_04_off000578d5.bin rtf-objdata-decoded RTF \objdata at offset 0x578D5 31803 bytes
SHA-256: af67a3ec93b6a2a599b20496663dda891ba3d460faca2e5fd04e998d4f9f774e

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