Malicious RTF — malware analysis report

Static analysis result for SHA-256 e3e34eab7acd8495…

MALICIOUS

RTF

39.2 KB
MD5: 685f452855c5ccc25f8afeefc676f633 SHA-1: 106bcd7cb034f1a9b97698da8d8c92b10deaf3eb SHA-256: e3e34eab7acd8495327de994f13d0ebfaa6a153fb110b52adad8cf752450d913
120 Risk Score

Malware Insights

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

The sample is an RTF document that contains embedded OLE objects and triggers the \objupdate directive, indicating an attempt to activate embedded content. Heuristics specifically identify a vulnerability related to the Equation Editor, a common vector for exploiting client execution vulnerabilities. The presence of these indicators strongly suggests the document is designed to exploit a vulnerability to download and execute a secondary payload.

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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001ca3.bin
570cb3d61e1bd4ba1b13f4d7d256b010e29fba23a943394701675c04bb4a1b3e		 rtf-objdata-decoded RTF \objdata at offset 0x1CA3 1667 bytes

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