Malicious RTF — malware analysis report

Static analysis result for SHA-256 ab4e601ebf1b34c1…

MALICIOUS

RTF

522.3 KB Created: 2021-07-04 18:32:00 First seen: 2021-07-10
MD5: 77b21b02a7eae79bc5d6af0d53c344ee SHA-1: 11f0bc3dfd0955cff3d8d089973cc804eae43853 SHA-256: ab4e601ebf1b34c1f770e0c89d918fd3c1c15e528c17f44b009b937ad474673e
142 Risk Score

Malware Insights

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

The RTF file contains multiple embedded OLE objects and triggers an OLE activation via \objupdate, which is a strong indicator of exploitation. The critical heuristic firing for CVE-2017-8759 confirms the exploitation of this specific vulnerability to achieve code execution. The embedded benign URL is not considered a malicious IOC.

Heuristics 5

  • 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.
  • \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 8 \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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000510b.bin rtf-objdata-decoded RTF \objdata at offset 0x510B 22587 bytes
SHA-256: 6eb22661e7e3ec322d36c85df154ca84c24083ecf2eaa8141aba59893a0b07cb
objdata_02_off00023283.bin rtf-objdata-decoded RTF \objdata at offset 0x23283 22587 bytes
SHA-256: cc62bd345715da18cbc76a87616a91070a49b0ddbd3721c3bd0dacc1251f7f99
objdata_03_off00030a13.bin rtf-objdata-decoded RTF \objdata at offset 0x30A13 22587 bytes
SHA-256: b03d59a4c9a1215ab154cdf56a98f09e603689a876bd0c324d1e8c762550d338
objdata_04_off000413fb.bin rtf-objdata-decoded RTF \objdata at offset 0x413FB 22587 bytes
SHA-256: ee9078ae82c84fc4e0ceae27d25511f6692de8bd0a5b6da099bd27f5cdeaa206
objdata_06_off0005f573.bin rtf-objdata-decoded RTF \objdata at offset 0x5F573 22587 bytes
SHA-256: e21ac3b6e87b1191854b19f8b29bd68c38f84a6a05d5176a68cf9b2a2de7da16

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