RTF malware analysis — malicious · 992b991f275f7c4d

MALICIOUS

RTF

7.1 KB First seen: 2018-06-21

MD5: ff9ad46b197719ab7fda6877640858d6 SHA-1: bc03a3ddc39cd228af9cbe147e2f137c209ef3f9 SHA-256: 992b991f275f7c4d2550d1a7fc7ab5035ebfceecc01247183d07b4beaf6541a6

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and triggers heuristics related to Equation Editor exploitation. Specifically, the presence of RTF_EQUATION_EDITOR and RTF_OBJUPDATE firings, along with ClamAV detection of Rtf.Exploit.CVE_2017_11882-6584355-1, strongly indicates exploitation of the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution when the embedded OLE object is activated.

Heuristics 5

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000003c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C	3622 bytes
SHA-256: `c9492c681fdc8de2061dd385af8b4fe793a421008c6fa5d126fd99d8c1cd4ebe`

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