RTF malware analysis — malicious · 80d325b1417c570d

MALICIOUS

RTF

8.4 KB Authoring application: Riched20 6.3.9600

MD5: 613bd22541523d468fe1fc6e6aa174aa SHA-1: eb6a19165494c2dfcb62a2faf2969b0279d80060 SHA-256: 80d325b1417c570dbb9a25d71ca28bc2f3d4e88a24394000f646175e24c1ed7f

260 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object specifically identified as Microsoft Equation Editor, triggering critical heuristics for CVE-2017-11882. The presence of ".objupdate" indicates that the embedded object is designed to be automatically activated, leading to the exploitation of the Equation Editor vulnerability for client execution. This is a common delivery mechanism for malware.

Heuristics 6

Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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_off00000100.bin` `7f0306c894abaaaf7ce61961770fe40bfffae7804388577b260deb1b61300729`	rtf-objdata-decoded	RTF \objdata at offset 0x100	3546 bytes

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