Malicious RTF — malware analysis report

Static analysis result for SHA-256 259013bfbee19962…

MALICIOUS

RTF

13.3 KB
MD5: ba7e3f53f66ea62261a14e23c95662ff SHA-1: 018ca9eb4ad824f478ced1478e98e9ec0e5b7024 SHA-256: 259013bfbee1996203cb57b64cadae50f481861c0b42c6579673c27a97a0ba8f
140 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability. The ".objupdate" directive forces the activation of this object, which is a known method for exploiting Equation Editor to execute arbitrary code. The file is classified as malicious due to this exploit. No document body text or scripts were extracted, limiting further analysis of the payload's intent.

Heuristics 4

  • 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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001d97.bin
2d3bf1a707e80a55ae6599f20a36f8c06ae18bff163b64af0c9429f3bea00d7b		 rtf-objdata-decoded RTF \objdata at offset 0x1D97 2171 bytes

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