Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 181c155d803dc8a7…

MALICIOUS

RTF / .DOC

21.7 KB
MD5: a0ff38a209b89f1ec079e16847b696d4 SHA-1: 2a1891664c07117975622dbc04617cc0298d93ea SHA-256: 181c155d803dc8a7e16b622b143276419d8433d55fefae673e6bb2149eb4e081
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 heuristics related to the Equation Editor and CVE-2017-11882. This indicates the file is designed to exploit this vulnerability for code execution. The presence of ".objdata" and ".objupdate" sections further supports the exploitation of OLE object activation. No document body or script content was available for further analysis, but the exploit itself is sufficient to infer a malicious intent to execute arbitrary code.

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_off00000f17.bin
0af814c05fbb9f9e5802977829f7653f6445cb38a58a0b6b2e02a69c3288a2b0		 rtf-objdata-decoded RTF \objdata at offset 0xF17 1753 bytes

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