Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 f1502050c9c1928c…

MALICIOUS

RTF / .DOC

9.8 KB First seen: 2022-07-29
MD5: 688ccd78bef4bd7c35c57fa977f38faf SHA-1: a1022e417b54c1bb6cf7c0bf7aaf8134d321c27e SHA-256: f1502050c9c1928ca133291f3e07e68affb7067c940a441b7005a10e382e060c
200 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The file is an RTF document containing an embedded OLE object that exploits CVE-2017-11882 through the Equation Editor. The presence of the SE_ENABLE_LURE heuristic indicates the document likely prompts the user to enable content, a common tactic for macro-based malware delivery. The exploitation of Equation Editor suggests a downloader or dropper functionality.

Heuristics 6

  • Obfuscated Equation Editor ProgID + activation critical CVE related RTF_EQUATION_EDITOR
    RTF decodes to an Equation.3 ProgID from top-level \objdata hex after nested RTF junk groups are ignored, and the document also contains \objemb plus \objupdate activation. This is an obfuscated Equation Editor exploit surface associated with CVE-2017-11882 / CVE-2018-0802 families, but no exact malformed MTEF CVE primitive was recovered from this object.
  • 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.
  • \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
  • 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_off00000daf.bin
0a670f0cdfe5dae1b0d181b7284f5c5232ae4615a1bd34b89bbb496d7acd0672		 rtf-objdata-decoded RTF \objdata at offset 0xDAF 1971 bytes

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