RTF malware analysis — malicious · 9268ffd4a8900450

MALICIOUS

RTF

15.7 KB

MD5: b080f54223739d9c845619084b86d4ec SHA-1: cbbb5dc64b35ea0e810941e94af4e8f57424bddb SHA-256: 9268ffd4a89004505e03ae5297a95237459c604ac38fa18875ce83fff9b02599

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document that contains embedded OLE objects, specifically triggering heuristics related to the Equation Editor vulnerability (CVE-2017-11882). The \objupdate directive forces the activation of these embedded objects, leading to arbitrary code execution. While no specific second-stage payload or URL was directly extracted, the nature of the exploit strongly suggests the intent is to download and execute further malicious content.

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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001a7d.bin` `1c68d95abf96517e2719a80691bf78d822f8f944f5c32c6bb2f5b6dd13d3cfcd`	rtf-objdata-decoded	RTF \objdata at offset 0x1A7D	1949 bytes

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