Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d52ad198b3121b0c…

MALICIOUS

RTF / .DOC

622.6 KB Created: 2019-09-17 13:59:00
MD5: 7245e4053bd911622d0f073739a36c1e SHA-1: 775948cde14fdf9a0bf375cd5a3dbb07cf7a1aa7 SHA-256: d52ad198b3121b0cf748339177fb2987b198cf27c82c0d7ffbb26418557a9a89
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell T1204.002 Malicious File

The sample is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor. Critical heuristics indicate exploitation of CVE-2017-8759, a known vulnerability in MSXML that allows for OLE object activation. This suggests the document is designed to exploit this vulnerability to execute arbitrary code, likely to download and run a 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_off00090f17.bin
6dce83538d050e64ac9452c44aadc897eeebc5e6f157bf4ce7e39d42937126f7		 rtf-objdata-decoded RTF \objdata at offset 0x90F17 3739 bytes

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