Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 7bdfa0456c326f2f…

MALICIOUS

RTF / .DOC

20.4 KB
MD5: 379088ac1a059bd605fc961bd94ff48e SHA-1: 179c05f71550bc310ca0805d6a3e56ebffff5dce SHA-256: 7bdfa0456c326f2f8081e9aa456395a2db775e24037c62efc52ab89d2b25a172
180 Risk Score

Malware Insights

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

The sample is an RTF document containing OLE object data, specifically triggering heuristics related to Equation Editor and CVE-2017-11882. This indicates exploitation of a known vulnerability for client execution. The presence of ".objdata" and ".objupdate" sections further suggests the document is designed to activate embedded objects, likely to download and execute a secondary 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_off000014c3.bin
091b9244b8db7c99f74e40ca6702aa0941ab5cd498527e85c775774b7f8b9291		 rtf-objdata-decoded RTF \objdata at offset 0x14C3 1585 bytes

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