Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 7592961869946fc4…

MALICIOUS

RTF / .DOC

860.7 KB First seen: 2022-10-24
MD5: 89fe77ed9a8487e44bccd003079063eb SHA-1: b3aeaa5df29ab8d5da9a4f579417a9b7beb4f1b3 SHA-256: 7592961869946fc47cdf9cd06a58f11bdec93137f2554e543a3f5914c9f3c6b6
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The RTF document contains embedded OLE objects and specifically triggers the CVE-2017-11882 vulnerability through the Equation Editor. This exploit is designed to embed and activate malicious content, likely leading to the execution of a secondary payload. The presence of `Equation.3` as a ProgID strongly indicates the exploitation of this known vulnerability.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000012b8.bin
f63ed7e94eea57574e51e2ca3fbe21c773ca0ff9c5fa396f0035e5b1d5aae594		 rtf-objdata-decoded RTF \objdata at offset 0x12B8 81122 bytes
objdata_01_off0002ee14.bin
88f5b6696cbfd1ccbdc3bf6178a17770f1d05944ae1f8131169743e47791e9fa		 rtf-objdata-decoded RTF \objdata at offset 0x2EE14 140887 bytes

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