RTF malware analysis — malicious · 17ee366ac90069ce

MALICIOUS

RTF

76.3 KB First seen: 2024-10-08

MD5: 7a6ed8a97ecfa26cfa0d2d7eb3fae5f9 SHA-1: a80685947466f96c75f3f7927881ca7d70047b86 SHA-256: 17ee366ac90069cef2e031d80bbd9898173bc46d746bb39886555f2ddc55379c

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains embedded OLE object data and specifically triggers an Equation Editor exploit. The \objupdate heuristic indicates that the embedded object is designed to be activated automatically, which is a common technique for exploiting vulnerabilities like the Equation Editor flaw. This strongly suggests the file is a dropper intended to execute a secondary 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_off00002069.bin` `6970d73c2362ceb74df94e528edbbb8fb3a85c84456b9b38ee974de743c39b16`	rtf-objdata-decoded	RTF \objdata at offset 0x2069	1637 bytes

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