Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e39038be57376d18…

MALICIOUS

RTF / .DOC

13.8 KB First seen: 2022-08-03
MD5: b346498bf38bada810525294a72919a6 SHA-1: db9c3bd034c736d6e1a55735c6ed191ccf89a1cb SHA-256: e39038be57376d180fbcd810c01dd4d1312058dc7507cced7acbbe1d5f926c22
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 RTF document contains an embedded Equation Editor object that is activated via the CVE-2017-11882 vulnerability. The presence of the 'SE_ENABLE_LURE' heuristic indicates that the document likely attempts to trick the user into enabling editing or macros. This exploit is commonly used as a dropper to download and execute further malicious content.

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_off00002032.bin
299b3784e4fc0614b4a7b91faaa257278654d557f908e22934b1c31d82a90414		 rtf-objdata-decoded RTF \objdata at offset 0x2032 1782 bytes

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