Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 ab913f472ec76155…

MALICIOUS

RTF / .DOC

3.6 KB
MD5: 2d8a9ae3ab279c52caacd842a89696fd SHA-1: 6ebb8c361702a080b87ed2c572033183fad7e5b5 SHA-256: ab913f472ec7615590929ab475d8911b4ff35fc641ff7e5654fe5792a6288227
140 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects, specifically triggering critical heuristics related to the Equation Editor vulnerability. The \objupdate directive indicates that the embedded object is designed to be automatically activated upon opening, leading to the exploitation of the Equation Editor. This strongly suggests a malicious document designed to deliver a payload via this known exploit.

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_off0000006e.bin
7127b5c0faa15fb1307664d47536e5abd97d63922edd01df16eaa2e6cf73c77c		 rtf-objdata-decoded RTF \objdata at offset 0x6E 1701 bytes

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