Malicious RTF — malware analysis report

Static analysis result for SHA-256 e11f59ce9dae9fcf…

MALICIOUS

RTF

13.1 KB
MD5: e77f5e642756206d8f21e0230a134040 SHA-1: d4b3eb5fe7af003da6141a57cb641bd960506a70 SHA-256: e11f59ce9dae9fcff7ff4c8d3d119dd663a1918d084f8cda7b30c474cd141642
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-1997-2455 or similar). The ".objupdate" directive forces the activation of this object, which is designed to download and execute a second-stage payload. The document body is heavily obfuscated and does not provide direct clues to the user-facing lure.

Heuristics 3

  • Split hex Equation Editor ProgID + OLE object critical 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_off00001c48.bin
d07be56d280e0da1446b80117bb85e84222b2b72731181b3ce7e9c0102c3dcaf		 rtf-objdata-decoded RTF \objdata at offset 0x1C48 1917 bytes

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