RTF malware analysis — malicious · 0edba7adc522cd86

MALICIOUS

RTF

16.2 KB First seen: 2023-03-13

MD5: b70b6b11d348947264298dc43449b9a9 SHA-1: bf685127779ec95babc2c449e34eec69f2a93eee SHA-256: 0edba7adc522cd868ce53662fd04cfa6127a93ce1a64e8069931a7a1da6ce7c1

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object that exploits a known vulnerability in the Equation Editor component. The ".objupdate" directive forces the activation of this object, leading to code execution. This is a common technique for delivering secondary payloads, such as downloaders or backdoors.

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_off00001f14.bin` `497a94436d2ce70f50301069f34af36c124545b2e5451a5f9389228a07dee4ff`	rtf-objdata-decoded	RTF \objdata at offset 0x1F14	1828 bytes

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