Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 ecd03e928fa7bd24…

MALICIOUS

RTF / .DOC

159.6 KB
MD5: 15b9ea706836f9a49e8e682048c076fe SHA-1: d2f6b43b678a73cd147c117441200bfb3f41f194 SHA-256: ecd03e928fa7bd244efd88e1064eb22601e6d6b60228731024067f546807ec31
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains embedded OLE objects, specifically related to Equation Editor. Heuristics indicate the activation of Equation Editor with a decoded object offset pointing to CVE-2017-11882, suggesting exploitation of this known vulnerability. This technique is commonly used to deliver a malicious payload, likely through a spearphishing attachment.

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_off000018e0.bin
147130b5f9f6f088ef775142a80490141b8bd0708796ca2139b22a0c72c9882d		 rtf-objdata-decoded RTF \objdata at offset 0x18E0 1468 bytes

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