Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 dd131b523e198620…

MALICIOUS

RTF / .DOC

3.1 KB
MD5: b7637e47ba59800d5286f30c15ab1a8a SHA-1: b593004f32c805fff51af01d46a2845f7870f8a3 SHA-256: dd131b523e19862053b938fcd6468db4a3a6e42259c1fd01d854bd87225a2019
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains an embedded OLE object specifically identified as related to CVE-2017-11882, which is a known vulnerability in Microsoft Equation Editor. The presence of ".objdata" and ".objupdate" sections further indicates that the embedded object is intended to be activated, likely leading to arbitrary code execution. No scripts were extracted, and no document body was available for analysis, but the exploit technique is clearly indicated by the heuristics.

Heuristics 5

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000008a.bin
c96ea561c7016ea315207a568bba47216b0934cbf3a6a86985227ac71d356054		 rtf-objdata-decoded RTF \objdata at offset 0x8A 1379 bytes

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