RTF malware analysis — malicious · c3c93d712f93c4ab

MALICIOUS

RTF

80.1 KB First seen: 2024-09-27

MD5: 5d0660bf632fd0fa66bc638775eb4b88 SHA-1: f55a1c4a78252cc765f1747c321d0812ae0f9f38 SHA-256: c3c93d712f93c4abe746760e31182f3cd5dfea00cb99176322f843ac20096697

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution: Malicious File

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The ".objupdate" directive forces the activation of this object, leading to arbitrary code execution. This is a common technique for delivering second-stage malware, though no specific payload or network indicators were directly extracted from this sample.

Heuristics 4

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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000012d9.bin` `2082507ff186e71cbce6c252f5f934d6ea051bcabbb70ea53603cdbf649663b9`	rtf-objdata-decoded	RTF \objdata at offset 0x12D9	1641 bytes

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