Malicious RTF — malware analysis report

Static analysis result for SHA-256 28fa16e342699bce…

MALICIOUS

RTF

3.6 KB First seen: 2018-10-07
MD5: 691f3f0f675eccabbabe79cb495d40f8 SHA-1: 03f46756634bd61e62cd827155dd8752af2d09d3 SHA-256: 28fa16e342699bce1230b460b862e9cea77e1c35a407ef025b6c8da594cabdde
120 Risk Score

Malware Insights

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

The RTF document contains embedded OLE object data and uses \objupdate, indicating an attempt to exploit the Equation Editor vulnerability (T1203). This is a common method for delivering malicious payloads via email attachments (T1566.001). The specific exploit mechanism points to a known vulnerability in the Equation Editor component.

Heuristics 3

  • Split hex Equation Editor ProgID + OLE object critical CVE likely 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 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 1818 bytes
SHA-256: 8d2416ade15274d4dd2a8cbae16fb2b06554c6c856223d7e44db0280445455ae

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