Malicious RTF — malware analysis report

Static analysis result for SHA-256 8e41a7444f467d9f…

MALICIOUS

RTF

11.6 KB First seen: 2023-03-09
MD5: 097b922130a3687dc3406def32a98c89 SHA-1: f7190d93e5c193c17c2ed773fcb78dab223c6821 SHA-256: 8e41a7444f467d9f4c421a7506c8cdc48e0d706e53049ce05c34caee65e1fb67
120 Risk Score

Malware Insights

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

The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The presence of \objupdate indicates that the OLE object is designed to be activated automatically, leading to the exploitation of the Equation Editor. This is a common technique for delivering secondary payloads, though no specific payload or download URL was directly extracted from this sample.

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_off000013bf.bin
b5a772171e7f86f8e738e983c582bec44148bb4b11d595ce169167f2483f329b		 rtf-objdata-decoded RTF \objdata at offset 0x13BF 1393 bytes

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