RTF malware analysis — malicious · 55ba7cdf4f44829f

MALICIOUS

RTF

97.9 KB First seen: 2024-10-09

MD5: f31ba8351265a427efdf3b2d24ec6fab SHA-1: 0dc5a1c62306ff5e581a15408edc7ea15433a6d2 SHA-256: 55ba7cdf4f44829fb470c66da2e831fe28596a2fcc33b74c0f8f6117786af040

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1204.002 Malicious File

The RTF document contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The \objupdate directive forces activation of this object, which is known to be exploitable for arbitrary code execution. This indicates the document is designed to exploit this vulnerability to deliver a secondary payload, though the specific nature of that payload cannot be determined from the provided evidence.

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_off00001ba6.bin` `9f7a7971dd15902fa948d8133f655c7f1993344bdff76344ba2a6c99d2bb6d30`	rtf-objdata-decoded	RTF \objdata at offset 0x1BA6	1998 bytes

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