Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 86230d540df94a3b…

MALICIOUS

RTF / .DOC

14.0 KB
MD5: ed7df6a82bbbfe1cf63ff41ee13a9edf SHA-1: cfcb0917fd2634dc0d69b82110bfeab403012445 SHA-256: 86230d540df94a3bf87d17f535a7818c385b2db8b027ce45b48d80ffe5592055
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability related to Microsoft Equation Editor. This exploit allows for arbitrary code execution, likely to download and run a secondary payload. No specific family could be identified, and no IOCs were directly extractable from the provided evidence.

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_off00000c82.bin
89f925998500d7a90be54c0c1730086237f20a19d6c3b5533d073b31af1eedb5		 rtf-objdata-decoded RTF \objdata at offset 0xC82 1688 bytes

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