Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 8d461a9f0224526f…

MALICIOUS

RTF / .DOC

631.3 KB Created: 2019-09-17 13:59:00
MD5: 6321999ce58657e72a90f73db0b336ab SHA-1: 70c1580cf4e675ca05e2c188495e98956c309530 SHA-256: 8d461a9f0224526f24eb812d24647098ee64a40d3479d028f2d8e2a20dd9bc96
200 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability (CVE-2017-8759). This exploit allows for the execution of arbitrary code upon opening the document. The presence of ".objupdate" further indicates an attempt to force OLE activation. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact second-stage payload.

Heuristics 6

  • 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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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 1 \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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00097ea4.bin
3254e1c10e684141f589974456644c37be9fbec439cd7430d47112e1b47b4ea2		 rtf-objdata-decoded RTF \objdata at offset 0x97EA4 3739 bytes

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