Malicious RTF — malware analysis report

Static analysis result for SHA-256 be4f7ec80edb008a…

MALICIOUS

RTF

32.1 KB
MD5: 30c424ab05e61e2195fdf7e3694d2166 SHA-1: 9b6392f5fe31c87b4a7a7be51e19d748a5657437 SHA-256: be4f7ec80edb008a8ce1fdac488f14fb652f21ccd87cda469c80c866ab7ef912
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is known to be used to download and execute arbitrary code. The presence of the RTF_OBJDATA, RTF_OBJAUTLINK, and RTF_OBJUPDATE heuristics further indicate the exploitation of OLE object handling within the RTF structure. The embedded URL heuristic suggests a download mechanism for a secondary payload.

Heuristics 4

  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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_off000013fb.bin
f1bf1841351e05dbecfebbf2f0578c6eb07aea5d952a693c7f1198dfc259fa9e		 rtf-objdata-decoded RTF \objdata at offset 0x13FB 8444 bytes

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