Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 fea6fbb5a38b7bc5…

MALICIOUS

RTF / .DOC

2.89 MB Created: 2019-09-17 13:59:00
MD5: d9614eee789a2640493539a3309e2abe SHA-1: 32d8df083d78c904746a09d326e421dfd0b19c8b SHA-256: fea6fbb5a38b7bc5b11d4be444fafaea01820621984b173888256915dc99de8a
200 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an RTF document containing an embedded OLE object, specifically triggering heuristics for Equation Editor and the CVE-2017-8759 vulnerability. This indicates exploitation for client execution. The presence of ".objupdate" suggests an attempt to automatically activate the embedded object, likely to download and execute a secondary payload. No specific family could be identified.

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_off002d600e.bin
bd529d86775a74c62cf052b75a9247949212579b9809478bf597a26153aeaf53		 rtf-objdata-decoded RTF \objdata at offset 0x2D600E 3732 bytes

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