Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 82f0119af5213025…

MALICIOUS

RTF / .DOC

62.0 KB
MD5: 2d7b6b6a71a069f6f73622f7c41651e7 SHA-1: 8db8170197f198feef526c394cd6f9c7097d6074 SHA-256: 82f0119af5213025278d36ef5161f597e137235295853c6cd455b3e2386a54da
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Phishing: Spearphishing Attachment

The RTF file contains embedded OLE objects and specifically triggers the Equation Editor vulnerability CVE-2017-11882. This vulnerability allows for arbitrary code execution when the embedded object is activated, indicating a likely exploit delivery mechanism.

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_off000000a2.bin
5f26c1926ae1a6389cb386d8c75c898b961b44a758c0610816bdd0a75a9ea76d		 rtf-objdata-decoded RTF \objdata at offset 0xA2 20722 bytes

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