Xls.Malware.Sdrop-10036532-0 — RTF malware analysis

Static analysis result for SHA-256 de0d909741a64ab8…

MALICIOUS

RTF

3.22 MB Created: 2019-12-20 17:39:00 First seen: 2020-07-24
MD5: f27b41126cb0f7a050c2765f3566cbf7 SHA-1: fc38786e85f5070869a81f0ed39f96c0f8e5b24f SHA-256: de0d909741a64ab8c03d83d74209e9757dc16f40bdfd8ac1205af63263cba4c0
262 Risk Score

Malware Insights

Xls.Malware.Sdrop-10036532-0 · confidence 95%

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

The RTF file contains multiple OLE objects and exhibits characteristics of exploiting CVE-2017-8759 for OLE activation. This suggests the file is designed to execute malicious code, likely a downloader, upon opening. The ClamAV detection name 'Xls.Malware.Sdrop-10036532-0' further supports this assessment.

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 ~1002KB 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.c In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000ca57a.bin rtf-objdata-decoded RTF \objdata at offset 0xCA57A 119854 bytes
SHA-256: 4dca69dadfa278ddbdbd05d9e5abb78e9286490e80f463c5d1d876fd84db8e68

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