Malicious RTF — malware analysis report

Static analysis result for SHA-256 7a73b538c6cb6952…

MALICIOUS

RTF

456.4 KB Created: 2020-04-08 08:20:00 First seen: 2020-09-15
MD5: 38af10a106a932d9a82afd58e6f4c025 SHA-1: d0dd7c252acc129aca6038c51d9ecbe241386417 SHA-256: 7a73b538c6cb6952be5c4b1ad14d0da09360f908a46027de200f5c0c11f70655
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, with a critical heuristic indicating exploitation of CVE-2017-8759. This vulnerability allows for OLE object activation via \objupdate, which is likely used to trigger the execution of a secondary payload. The presence of embedded OLE objects and the specific CVE exploit strongly suggest a malicious document designed to compromise the user's system upon opening.

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 6 \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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002cfa.bin rtf-objdata-decoded RTF \objdata at offset 0x2CFA 26171 bytes
SHA-256: 7c879b47ca95552a0e7a0033281c26757baf5f02ff5e31eb071dd5ce1ae78a9b
objdata_01_off00014205.bin rtf-objdata-decoded RTF \objdata at offset 0x14205 26171 bytes
SHA-256: 8a7f31203129cf2212d0c0465b3de4b362646b189945bbb48bb51f4772692058
objdata_02_off00025710.bin rtf-objdata-decoded RTF \objdata at offset 0x25710 26171 bytes
SHA-256: 88ea7a412f7acb8a4be907a1fef8b41d66b0d38c3fd5beefe32d049af3a76b0c
objdata_03_off00036c1b.bin rtf-objdata-decoded RTF \objdata at offset 0x36C1B 26171 bytes
SHA-256: 9fd08d6bd549c84e43326bc2b50a4699e151eaf391e271e85caaa1b3e696ef72
objdata_04_off00048126.bin rtf-objdata-decoded RTF \objdata at offset 0x48126 26171 bytes
SHA-256: fbc420b7d55969c909faa9d9b7817c6c9f9e32f59e5f121366f0500b1caaec2f
objdata_05_off00059631.bin rtf-objdata-decoded RTF \objdata at offset 0x59631 26171 bytes
SHA-256: cd0294d6a84118230ac8bcaeafabbdf04bb59e230b49177348a836dedbcbf3e9

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