RTF malware analysis — malicious · 2f1e82a672e26e16

MALICIOUS

RTF

10.6 KB

MD5: 09b4dc7085245d88d5afdaf7933a2cc2 SHA-1: c4baffe8ce0c95e6301eb48fc725e824d16ad7b9 SHA-256: 2f1e82a672e26e16bc0f359146a07652b3a7badd54ada04079485f207102bcc2

120 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is an RTF document that contains OLE object data and specifically targets the Equation Editor vulnerability. The \objupdate directive indicates that the embedded OLE object will be activated, likely leading to the execution of a malicious payload. The heuristics strongly suggest exploitation of the Equation Editor to achieve remote code execution, which is a common initial access vector for malware delivery.

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_off00001345.bin` `db9bae44e95b2e89f6c83481eaa89f182671f87378343fa513bbf5e8090194db`	rtf-objdata-decoded	RTF \objdata at offset 0x1345	2114 bytes

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