Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 bdce733acad2d2c4…

MALICIOUS

RTF / .DOC

28.4 KB First seen: 2022-11-09
MD5: 80e37187403b9f159ddf4b24162faa2e SHA-1: d2fdaffa2fd38c19015a45339affe8c5d0520885 SHA-256: bdce733acad2d2c4453f0e3f9cec5b9bcd214e11e067f42c13c9144c16ac77a2
200 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559 Component Object Model T1059 Command and Scripting Interpreter

The sample is an RTF document containing an embedded OLE object specifically identified as related to CVE-2017-11882, exploiting the Equation Editor vulnerability. The presence of \objupdate and a lure to 'Enable editing' strongly suggests the document is designed to trigger the exploit upon opening, leading to arbitrary code execution. No scripts were extracted, but the exploit itself is the primary mechanism for payload delivery.

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.
  • \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
  • 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_off00005a68.bin
83790700d9c11dc78bd6adddfbad189e0c73a17987da715238cef3e14fe8a256		 rtf-objdata-decoded RTF \objdata at offset 0x5A68 1681 bytes

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