Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 ab32cba21e6d56ab…

MALICIOUS

RTF / .DOC

9.2 KB
MD5: 1cc4595624b92b99e6298d5655398530 SHA-1: 9b495942af2f72b83e67aa5c028195d643cf2ac1 SHA-256: ab32cba21e6d56ab601e14ad34e019ffb3fe7b06f43e13232302478d99f082f1
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 Malicious File T1059 Command and Scripting Interpreter T1559.001 Component Object Model Hijacking

The RTF document contains embedded OLE object data, specifically triggering the Equation Editor vulnerability (CVE-2017-11882). The heuristics indicate that the Equation Editor is activated via ".objupdate" and uses a specific ProgID, "eQuatIoN.3". This exploit allows for arbitrary code execution when the document is opened. No scripts were extracted, but the exploit itself is sufficient to deliver a payload.

Heuristics 5

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000120e.bin
4033d50a55c4b3b3c58df568b529aef3d4bb0568dc5dd8b2dfcdb27ea7d68638		 rtf-objdata-decoded RTF \objdata at offset 0x120E 1451 bytes

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