Malicious RTF — malware analysis report

Static analysis result for SHA-256 ecf3723307a39dc6…

MALICIOUS

RTF

2.74 MB Created: 2018-05-21 15:22:00 First seen: 2018-10-07
MD5: 25f5b658fad6e4011fb97132ddc41750 SHA-1: f415cb3623148da9bf6ce7e7ae1789b7c5eba50a SHA-256: ecf3723307a39dc60d58a4e197e4ecdfaee5c682d3d5179c21bcf966a671948b
402 Risk Score

Malware Insights

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

The RTF document contains multiple indicators of exploitation, including critical firings for CVE-2017-8759 and CVE-2018-0802, which are known vulnerabilities in MSXML and Equation Editor respectively. The presence of embedded OLE objects with large amounts of hex-encoded data suggests a payload is hidden within. The file is identified as malicious by ClamAV with a specific exploit signature.

Heuristics 11

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • 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.
  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • ClamAV: Rtf.Exploit.CVE_2018_0802-6825822-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
  • \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.
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~2603KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \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 In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002a88.bin rtf-objdata-decoded RTF \objdata at offset 0x2A88 1301505 bytes
SHA-256: 9d016e9cfc79d906292fc222c6530dc9494b5e4e8aa8b8ae61aea7dc9762bfe1
objdata_01_off0029905f.bin rtf-objdata-decoded RTF \objdata at offset 0x29905F 23898 bytes
SHA-256: c740fcdcf1d452572d180dd226cf0a1377731128e8eabd6f740127c7786c580e

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