Malicious RTF — malware analysis report

Static analysis result for SHA-256 3c33a7a465c21ddf…

MALICIOUS

RTF

45.1 KB
MD5: 4ebf790eeb332c5519247210464a8091 SHA-1: 35c4b8134a7b196f9f12889be1dec9cf20c8b13d SHA-256: 3c33a7a465c21ddfffae8ceb2f0bf76d40ce36c40fb6a6f00035a91c55377ab7
180 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects and specifically triggers the CVE-2017-11882 vulnerability related to Microsoft Equation Editor. This exploit is known to facilitate arbitrary code execution, which is typically used to download and run a second-stage malicious payload. No specific family could be identified from the available evidence.

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_off00001d73.bin
ff83ba703d78c75ee4cd9ef843769753702868f05bdbbaec32737e8a9f709bed		 rtf-objdata-decoded RTF \objdata at offset 0x1D73 1741 bytes

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