Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 5eca50af4c31e27f…

MALICIOUS

RTF / .DOC

28.3 KB First seen: 2022-11-29
MD5: 449916a2ec13f0f0663bc09eb620ad3a SHA-1: c8b0bc42852957eab9ae17a1ca1b4ff808174865 SHA-256: 5eca50af4c31e27fc0cd5e5457933baa221473073ca6f16ff5c56160bddf1aaa
220 Risk Score

Malware Insights

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

The sample is an RTF document containing an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). The document body contains a lure related to marketing strategy, likely to trick the user into enabling content. The presence of the Equation Editor exploit indicates the document's primary purpose is to achieve code execution on the victim's machine.

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_off00005b91.bin
39b688a441483480ef6144bbdf35a8727e854618417dc7af0f5b90b6aad49eec		 rtf-objdata-decoded RTF \objdata at offset 0x5B91 1560 bytes

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