RTF malware analysis — malicious · 098bfe7ab9c2ca61

MALICIOUS

RTF

87.4 KB First seen: 2024-08-21

MD5: 7d3b215b98532e8570e22f353da4223e SHA-1: 004b80efe852e998a9ec7c67cf524d5abb660d1c SHA-256: 098bfe7ab9c2ca61fc488b0e9751adc098330485b49023852a3fcccace8a227f

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The ".objupdate" directive indicates that the embedded object will be activated automatically upon opening the document. This exploit is known to download and execute a secondary payload, making it a critical threat.

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_off000005ae.bin` `81c4eda2b141aa047bbfd4ee23815d08eed8ddbaa432aa33768a07eec0e91c19`	rtf-objdata-decoded	RTF \objdata at offset 0x5AE	1893 bytes

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