RTF malware analysis — malicious · 741032bb2286b7ef

MALICIOUS

RTF

7.3 KB

MD5: fc5a72d2a37fc811d5692f03b3a95f5f SHA-1: 6b99ce04e0a7a200c60324a4a763ddf7276a2089 SHA-256: 741032bb2286b7ef3d963bc4a25d6dc6bd10f58cf589115436ce9e6022603531

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating exploitation of a known vulnerability (CVE-2017-11882). The \objupdate directive forces the activation of this object, leading to arbitrary code execution. While no specific payload or C2 infrastructure was directly extracted, the exploitation pattern strongly suggests the document's purpose is to download and execute a secondary malicious payload.

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_off00000911.bin` `92eac733e3514cc7fc8e2a45e975949236edd1fc7b2a936e215c990946df3707`	rtf-objdata-decoded	RTF \objdata at offset 0x911	1582 bytes

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