Rtf.Dropper.Agent-7648431-0 — RTF malware analysis

Static analysis result for SHA-256 a659ae4eafa00e8a…

MALICIOUS

RTF

1.08 MB Created: 2019-09-17 13:59:00 First seen: 2020-05-25
MD5: 37cbbfd05299fb626a5906876f993e50 SHA-1: 56392c8c34e03575c1f3ce3678baf4a2361e29ae SHA-256: a659ae4eafa00e8a292e0c5bda85adb4f6d2c83be8a2e43040d06be11a2b14a2
202 Risk Score

Malware Insights

Rtf.Dropper.Agent-7648431-0 · confidence 95%

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

The RTF file contains embedded OLE objects and triggers an ".objupdate" command, indicating an attempt to activate embedded content. The critical heuristic firing for CVE-2017-8759 confirms exploitation of this vulnerability, which is commonly used by droppers to download and execute further malware. The ClamAV detection name further supports this classification.

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-7648431-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7648431-0
  • \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_off00108181.bin rtf-objdata-decoded RTF \objdata at offset 0x108181 1413 bytes
SHA-256: 1aa1cfd97c5cdfac1126d9365d472123807c1de65d7cebb8e88eecd8e8ac6d04

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