Win.Malware.Fareit-6915967-0 — RTF malware analysis

Static analysis result for SHA-256 428a95942ec8da42…

MALICIOUS

RTF

2.74 MB Created: 2018-05-21 15:22:00 First seen: 2019-03-10
MD5: 872a326754e52f03d42f89370471568a SHA-1: 43a80d3a15a1379eed0534fbd4c81c747d627b74 SHA-256: 428a95942ec8da425606878f4b8da3eeec41e8383740a10488976cefb5313f8a
462 Risk Score

Malware Insights

Win.Malware.Fareit-6915967-0 · confidence 95%

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

The RTF file contains embedded OLE objects, including an Equation Editor object, which are configured to activate automatically using \objupdate. This activation exploits CVE-2017-8759, a vulnerability in MSXML, to achieve code execution. The presence of large hex-encoded data within the OLE object suggests a hidden payload, and ClamAV signatures confirm the detection of Win.Malware.Fareit-6915967-0.

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: Win.Malware.Fareit-6915967-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Malware.Fareit-6915967-0
  • \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: d627b0cf1103c5cb4109c36c5be190af15509ccc9b136401c68131f2912789c8
Detection
ClamAV: Win.Malware.Fareit-6915967-0
Obfuscation or payload: unlikely
objdata_01_off0029905f.bin rtf-objdata-decoded RTF \objdata at offset 0x29905F 23898 bytes
SHA-256: c740fcdcf1d452572d180dd226cf0a1377731128e8eabd6f740127c7786c580e

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