Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 221314a944cb949c…

MALICIOUS

RTF / .DOC

17.8 KB
MD5: 0ddf7377fc1b9f0d9d73ec65f747c2d1 SHA-1: 06ed2f030992a8e03139a25e54489b7ea085374b SHA-256: 221314a944cb949c8367c4bd740f54ac0482a13eb3c8ec4e82ffb37c85e25b34
180 Risk Score

Malware Insights

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

The RTF document contains embedded OLE object data, specifically related to Microsoft Equation Editor. Heuristics indicate the activation of Equation Editor with a ProgID suggesting exploitation of CVE-2017-11882, which allows for arbitrary code execution. This points to a malicious document designed to exploit this known vulnerability.

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_off00001ca0.bin
081fca755bf5cc5c492df0135b795db745086c3bf4fd56b19639d264bceb2ef7		 rtf-objdata-decoded RTF \objdata at offset 0x1CA0 1688 bytes

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