RTF malware analysis — malicious · bab68f897abeeeb9

MALICIOUS

RTF

79.3 KB First seen: 2024-08-20

MD5: fdfdf8e4a9dcd273d721f11293c11553 SHA-1: 99729df948cca1e07c1905d857949a1a9c54c9a4 SHA-256: bab68f897abeeeb93c75ef0be92a2bfde71ac395928cab7f5c44258b3ddcf6d0

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882 is a common exploit for this). The heuristics RTF_EQUATION_EDITOR, RTF_OBJUPDATE, RTF_OBJEMB, and RTF_OBJDATA strongly indicate exploitation of this vulnerability to achieve code execution. The embedded OLE object data is the likely vector for delivering a secondary malicious payload.

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.

Filename	Kind	Source	Size
`objdata_00_off00001093.bin` `7cf0a24d33b22baf71d7d908c1a3e7746a7b0014189cc55230d6b17b8a50e474`	rtf-objdata-decoded	RTF \objdata at offset 0x1093	1635 bytes

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