Malicious RTF — malware analysis report

Static analysis result for SHA-256 b54a29437abf06ea…

MALICIOUS

RTF

2.50 MB
MD5: 708f099ac9e47b64a0522b5f01c8e252 SHA-1: d5d7790fc5f5b476cac740995ce3ded0d5cc13fd SHA-256: b54a29437abf06ea2804e8f1576847f5efc8a4509bcd11f2f8cfb95e16bc036f
220 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data, specifically related to Microsoft Equation Editor. Critical heuristics indicate the presence of a payload associated with CVE-2017-11882, which is known to exploit a vulnerability in the Equation Editor to achieve code execution. This suggests the file is designed to deliver a secondary payload upon opening.

Heuristics 5

  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~2622KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000008b.bin
6883bf693a454d41399ac1b3cf342edf6acb6c6b5ea094b8c917b531b07cbdf4		 rtf-objdata-decoded RTF \objdata at offset 0x8B 1048939 bytes

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