Malicious RTF — malware analysis report

Static analysis result for SHA-256 d7a82c1ad2b0ad98…

MALICIOUS

RTF

8.9 KB First seen: 2019-09-30
MD5: 1450e5697578eb0d76440effd32f1587 SHA-1: e71bbbfbb5419af8f564eb8b3d7fb0bab5c8dc5e SHA-256: d7a82c1ad2b0ad9804bec498dc6eeacacf7d6be5acb66f17e201c2773c885fc3
160 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The presence of RTF_EQUATION_EDITOR and RTF_OBJAUTLINK heuristics strongly indicates exploitation for client execution. The document likely serves as a spearphishing attachment designed to deliver a secondary payload.

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
  • 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_off00000140.bin rtf-objdata-decoded RTF \objdata at offset 0x140 4171 bytes
SHA-256: 7413b020b6c957a7a5c32c39cf3ab39bf2c381150adb84d2e34b325d4d300a63

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