Malicious RTF — malware analysis report

Static analysis result for SHA-256 4e8db4ddc184cdc9…

MALICIOUS

RTF

5.4 KB
MD5: 378445f91b8dd5ed7ccdb98114b23541 SHA-1: a1b9ecdba04329aed637eaf4b4b943ddcee80312 SHA-256: 4e8db4ddc184cdc91ebf5c04312c98d4274cdf29eedeadaa32c2b3694f655437
180 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and specifically triggers the CVE-2017-11882 vulnerability related to Equation Editor. This indicates the file is designed to exploit this known vulnerability for client-side execution, likely delivered as a spearphishing attachment.

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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000103.bin
d12f9794e3b418ff03b74a765f096defdcc369d604891814c5d147cda80ba34f		 rtf-objdata-decoded RTF \objdata at offset 0x103 2493 bytes

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