RTF malware analysis — malicious · 7b33de62dafef125

MALICIOUS

RTF

86.5 KB First seen: 2024-10-12

MD5: c7b4ec460b896ccd9f368467d06ee44b SHA-1: 58d4ed5d5791401f4555d6278a179e5c65563c8a SHA-256: 7b33de62dafef125fe428afe47e9a353749a6632d58809ce428b7514886b49b6

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object, specifically identified as a forged Equation Editor, which is a known vector for exploiting vulnerabilities. The presence of \objupdate indicates an attempt to force the activation of this embedded object. This strongly suggests the file is designed to exploit a vulnerability upon opening, likely to download and execute a secondary payload.

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_off0000203e.bin` `609e4611ce2e9a9ec4c24e8c0016e9abd385950219d6a989d70ddb08848a27ae`	rtf-objdata-decoded	RTF \objdata at offset 0x203E	1556 bytes

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