Doc.Dropper.Agent-7111893-0 — RTF malware analysis

Static analysis result for SHA-256 dc89bd9e9eeb2fc7…

MALICIOUS

RTF

1.90 MB Created: 2019-11-18 18:01:00 First seen: 2020-08-10
MD5: f25c00895e3142fbaf22e720f4cd935f SHA-1: a70a39d55cdd506bce3b8afc2d96104f58e2a914 SHA-256: dc89bd9e9eeb2fc7c2678d1f1ef2971ad5d07288057a26115b8143c1f8f55de4
262 Risk Score

Malware Insights

Doc.Dropper.Agent-7111893-0 · confidence 95%

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

The RTF file contains numerous embedded OLE objects with excessive hex-encoded data, indicative of a hidden payload. The critical heuristic firing for CVE-2017-8759 confirms exploitation of this vulnerability for OLE activation. ClamAV detection as 'Doc.Dropper.Agent-7111893-0' further supports its role as a dropper. The embedded URL, though benign, is present within the RTF body.

Heuristics 8

  • 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: Xls.Malware.Sdrop-10036532-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Sdrop-10036532-0
  • \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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1156KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 10 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
  • 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_off000030f8.bin rtf-objdata-decoded RTF \objdata at offset 0x30F8 91694 bytes
SHA-256: cc378b65b0b754a875a5aa006694c785dede6ca208f4625156c1d585fe64668f

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