RTF malware analysis — malicious · 3d6c87e8a900bca7

MALICIOUS

RTF

84.4 KB First seen: 2024-10-03

MD5: b7fbbb66d072c56f7d5d0f2e55e1385a SHA-1: 8e40debca697f6c7ce62ad638c01d51b527eb415 SHA-256: 3d6c87e8a900bca7cf641905229d6107044568a45c955a46ce835ec18a3b3262

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document that contains embedded OLE object data, specifically targeting the Equation Editor vulnerability. The \objupdate directive indicates that the embedded object will be activated automatically, likely leading to the execution of a secondary payload. The critical heuristic firing for RTF_EQUATION_EDITOR strongly suggests exploitation of this known vulnerability.

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.

Filename	Kind	Source	Size
`objdata_00_off0000196a.bin` `f4b144f2f0280c73c8a05a1afcbe87c7580518d571303e8196fc0d8b7da30268`	rtf-objdata-decoded	RTF \objdata at offset 0x196A	1983 bytes

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