Malicious RTF — malware analysis report

Static analysis result for SHA-256 56a430942d5fb84a…

MALICIOUS

RTF

13.2 KB First seen: 2023-03-23
MD5: c3e8b482ed3986690fcdc9cbab9a0b7f SHA-1: 2d12d302a7c537c9d84fd8ba97af28ab40a4ca60 SHA-256: 56a430942d5fb84a87534dbbaa517c1193504c2677e3ceb9009e41d75271785f
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The RTF document contains an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" directive forces the activation of this object, which is designed to download and execute a secondary payload. The presence of RTF-specific heuristics strongly indicates this exploit vector.

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_off00000c9e.bin
076767e34a03279ee54ba3a879c5b193dabe91111f4570e5b1b44adcf2406b7c		 rtf-objdata-decoded RTF \objdata at offset 0xC9E 2049 bytes

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