RTF malware analysis — malicious · 9828800e51d4dfaa

MALICIOUS

RTF

3.8 KB First seen: 2023-07-11

MD5: 8846926b44bfb63d26cadf47499403b5 SHA-1: eacb56c64aa7ff3cd074c78ba0ab15d176034b04 SHA-256: 9828800e51d4dfaa23226ae11095665b4eee8e1aa06b51c8d4e4002f1d36631e

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that decodes to a Portable Executable (PE) file, leveraging the Equation Editor vulnerability. The ".objupdate" directive forces the activation of this embedded object, leading to the execution of the malicious payload. The specific payload and its ultimate goal are not detailed in the provided evidence, but the exploit chain is clear.

Heuristics 3

Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
\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_off00000086.bin` `c0504edc9532e05a3d1f48ea64ada3da3d477bd5c9e5e2eb8ff633ab72cfce1e`	rtf-objdata-decoded	RTF \objdata at offset 0x86	1837 bytes

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