Malicious RTF — malware analysis report

Static analysis result for SHA-256 66ec3dc573dd1a9c…

MALICIOUS

RTF

18.8 KB
MD5: 8b37035fc1cf2172d2c9f322f96abeeb SHA-1: 05a80dc4c367d7a53c2ccc075f8bfa7af0f0005a SHA-256: 66ec3dc573dd1a9c4849dd29bfe37fd55c8d9e7f05efd0404a6e2ce0555cc6f6
180 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that triggers CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This exploit allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of the 'eQUaTIoN.3' ProgID strongly indicates the use of this specific vulnerability.

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_off00001411.bin
519222ca7e075713a6df221662a6abdba2ffc87f4120c72eefc3b32899020ce6		 rtf-objdata-decoded RTF \objdata at offset 0x1411 1362 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.