Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 7cc9b2b3d0c47224…

MALICIOUS

RTF / .DOC

28.0 KB First seen: 2022-11-25
MD5: 46764cb06b1389b60056d78301b841e1 SHA-1: bab7117234952898b231ce05343c1f07f7d58a81 SHA-256: 7cc9b2b3d0c4722462914da75e286925fb9327a2e989a25e1c87763d93f2495c
220 Risk Score

Malware Insights

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

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882) via an embedded OLE object. The 'SE_ENABLE_LURE' heuristic indicates the document likely contains instructions to enable content, a common social engineering tactic. The exploitation of the Equation Editor is a known method for initial execution of malicious code.

Heuristics 6

  • 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.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000055b1.bin
4c61191abd436790c3b21986f0c13481d632ee1dab972791c7a1941e2fda7cb0		 rtf-objdata-decoded RTF \objdata at offset 0x55B1 1901 bytes

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