Malicious RTF — malware analysis report

Static analysis result for SHA-256 6fac096d56d4a20b…

MALICIOUS

RTF

7.2 KB First seen: 2019-06-27
MD5: 36e5787098e34e03779b41073e2ca7fa SHA-1: 14633935a4aab3771f49b69a4e062569ad1657ab SHA-256: 6fac096d56d4a20be5fefb789c795c09948afcecc65c6e1f83659eaa8375b325
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and specifically triggers heuristics for the Equation Editor vulnerability (CVE-2017-11882). This exploit is known to allow for arbitrary code execution. No scripts were extracted, and the document body was truncated, but the presence of the Equation Editor exploit is a strong indicator of malicious intent.

Heuristics 4

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • \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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 3642 bytes
SHA-256: 1df4ffbf20fc59938cfeccb769318f1cf1a99df77276448689f6e6bfe45a93e2

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