RTF malware analysis — malicious · ca8cbf6d4259cd40

MALICIOUS

RTF

48.5 KB First seen: 2023-07-31

MD5: c998eab4dc1b884c6dba9eba84412a21 SHA-1: e86d3de53430a2a039c2c6db1dd4d2623d4f6ad0 SHA-256: ca8cbf6d4259cd404477add5bcea6974eb9526eade7ee5560f78108d62f787d5

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating an attempt to exploit the Equation Editor vulnerability (CVE-2017-11882). The \objupdate directive forces OLE activation, and the document body includes a lure to 'Enable editing' to bypass security measures. This suggests the file is a dropper designed to exploit this vulnerability upon user interaction.

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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00003607.bin` `f88168eae612ed3d943204842a913e44fe3c55b54f5c821007266e574cefcddf`	rtf-objdata-decoded	RTF \objdata at offset 0x3607	1846 bytes

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