Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e622ce897f7e518a…

MALICIOUS

RTF / .DOC

370.7 KB Created: 2019-09-17 13:59:00
MD5: 276ce735b285e84f3c9211ed48ac0c10 SHA-1: d7a1e84b239eb540ff37bcf9421b615b0db568cb SHA-256: e622ce897f7e518a76b6d4ef27c2e82494d50ba94db9bbeb6ec7ab71344642ab
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The RTF document contains an embedded OLE object that leverages the Equation Editor, specifically targeting CVE-2017-8759. This indicates an attempt to exploit a known vulnerability for code execution. The presence of ".objupdate" further suggests that the embedded object is designed to be activated automatically upon opening the document, likely leading to the download and execution of a malicious 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_off00056a18.bin
6feb314a73a1e9c6cc7b97ca2aa7a77e42f95e18241382529e353e87718415ba		 rtf-objdata-decoded RTF \objdata at offset 0x56A18 3739 bytes

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