Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 725a88dc1bcdf54f…

MALICIOUS

RTF / .DOC

14.6 KB
MD5: 76dbae1a896e218fa8479c3c8598caa0 SHA-1: 4dd102f90749cc1102883874bc8f41597688b043 SHA-256: 725a88dc1bcdf54fe6af82d53b1c6bfae9bfa584bc8cbae526b44742e4ccdb67
180 Risk Score

Malware Insights

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

The sample is an RTF document that contains embedded OLE object data, specifically triggering heuristics related to CVE-2017-11882 and the Equation Editor. This indicates the file is designed to exploit this vulnerability for code execution. The presence of `equAtIon.3` as a ProgID is a strong indicator of this exploit. The likely goal is to download and execute a secondary payload, although no specific URLs or scripts were extracted.

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_off000015db.bin
089e184e95ed91be52e9d9e79965167c56610e57f1937cc2e9a0adcb1c5bfbcd		 rtf-objdata-decoded RTF \objdata at offset 0x15DB 1799 bytes

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