RTF malware analysis — malicious · cdfb17843f162223

MALICIOUS

RTF

13.3 KB

MD5: 5a0a86f08f57c385df9626f26e1a3bc9 SHA-1: 1bf97c738dc4e41aae8a139db29e28b972699ba6 SHA-256: cdfb17843f16222331c67ee433ed5692f2eaa53d0490f7ab3fd606c82124f332

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF document contains an embedded OLE object that exploits CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This exploit allows for arbitrary code execution. The presence of ` tf_equation_editor` and `CVE_2017_11882_ACTIVATION_RELATED` heuristics strongly indicates this attack vector. No specific malware family could be identified, and no further IOCs were extracted.

Heuristics 5

Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED

RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
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_off00001a55.bin` `a9b8f33430ff05f7c15401042ca456cb7c9e435958867111a5400a5ec2c7a02f`	rtf-objdata-decoded	RTF \objdata at offset 0x1A55	1786 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.