RTF malware analysis — malicious · be3c88032ae6e943

MALICIOUS

RTF

15.0 KB First seen: 2023-03-16

MD5: 9d7082961f5f3573a91e9b74d03e9fae SHA-1: f9e589ba07c52dbd7c067982637bb4d84d161667 SHA-256: be3c88032ae6e9431d86e4d9209b0fbe2f157b3a8539cc3d3afb60f1985b8762

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The RTF file contains an embedded OLE object with a specific Equation Editor ProgID, triggering critical heuristics for the Equation Editor vulnerability. The \objupdate directive indicates that the OLE object is set to automatically activate upon opening, which is a common technique for exploiting this vulnerability. This suggests the file is designed to exploit CVE-2017-11882 to achieve code execution, likely for downloading and executing a secondary payload.

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_off000014b0.bin` `4d8232fa6673204cb5a0b82aa54270a3377158dde49b3b6a08712ee51e7af74a`	rtf-objdata-decoded	RTF \objdata at offset 0x14B0	2114 bytes

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