RTF malware analysis — malicious · a2d5136d554dacd4

MALICIOUS

RTF

75.9 KB First seen: 2024-07-30

MD5: 070b1946c9ab7ef8801ece97cc27eb0c SHA-1: d469fb9401ee305af169ab80aa1ebf60cf93049a SHA-256: a2d5136d554dacd410ed55cf6177ab3859c1bb27d3fddc048ab6fe1804dd3b53

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that leverages the Equation Editor vulnerability, indicated by the RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristic firings. This exploit likely facilitates the execution of embedded OLE object data, which is designed to download and run a secondary malicious payload. The specific nature of the payload cannot be determined from the provided evidence.

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_off00001c6b.bin` `d7e5e48683828682667de012316f9f1a18458c83c2f7f9e2abf9a93859b4db66`	rtf-objdata-decoded	RTF \objdata at offset 0x1C6B	1548 bytes

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