Malicious RTF — malware analysis report

Static analysis result for SHA-256 a10de26b864dd415…

MALICIOUS

RTF

25.4 KB First seen: 2019-04-18
MD5: 904ff6f35671fa5bd1f91ab126f8b384 SHA-1: ca0655ee94bbfab6f3ab8726572af1b0aaa860c8 SHA-256: a10de26b864dd415a6791945d44807e87826cc21dee82583b95ca4b793578e24
120 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 leverages a known vulnerability in the Equation Editor component. This exploit is designed to execute arbitrary code, likely leading to the download and execution of a secondary payload. The presence of the objdata artifact indicates the embedded object's content.

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_off0000530a.bin rtf-objdata-decoded RTF \objdata at offset 0x530A 2184 bytes
SHA-256: 47f33dfba2c36950d5bb4e2d016cc9b5af2a1494e11a431b000007ce006ec159

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