Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 782160b64f3fb9e5…

MALICIOUS

RTF / .DOC

1.17 MB
MD5: aafbe6a8474a197997f1695d95f234c6 SHA-1: 0a80c798cb463914fc93f662bbeb0015eb44bf95 SHA-256: 782160b64f3fb9e5fcdba0e21870133996daffa17b9c7cb3ba9d85631c23c0a9
180 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects, specifically triggering heuristics related to Equation Editor and CVE-2017-11882. This indicates the file is designed to exploit this known vulnerability for code execution. The presence of OLE objects and the specific CVE exploit strongly suggest a malicious document intended for initial compromise via spearphishing.

Heuristics 5

  • 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.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000f58.bin
1919d0644271cfbb1eb7f172d4725503d4b5e54acc86758497405e7370555ae4		 rtf-objdata-decoded RTF \objdata at offset 0xF58 52589 bytes
objdata_01_off0002e051.bin
d58e45cc3a60ce012b53972ea70846c80b4219924e4d59541626e9dbb3083e1d		 rtf-objdata-decoded RTF \objdata at offset 0x2E051 254566 bytes

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