RTF malware analysis — malicious · 7e4925140942ee05

MALICIOUS

RTF

109.8 KB First seen: 2019-05-10

MD5: 2b94fcef44071a2bbd8e8cd0f82e5146 SHA-1: 9a994f03935fa4629a59dee71fc3d7d3e20d2cc3 SHA-256: 7e4925140942ee0559ac03a6966d2f734388137e7e40245fdc0e01045c4ef766

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document containing OLE object data and a specific Equation Editor ProgID, indicating exploitation of a known vulnerability. The \objupdate directive forces OLE activation, leading to client-side code execution. No specific family could be identified, and no network IOCs were extracted.

Heuristics 3

Split hex Equation Editor ProgID + OLE object critical CVE likely 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_off0000d2de.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xD2DE	1529 bytes
SHA-256: `53e908b385c9ebddb06e336c8b6bf4e10f966bcb3c3a7be6f3ae7cd5a3b2ccea`

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