RTF malware analysis — malicious · 1963399b6747c4fa

MALICIOUS

RTF

7.2 KB First seen: 2018-06-30

MD5: 95a20ac507cf5703637d77962e888877 SHA-1: bca5706eaf82d521164cdfedacb188611b1bf860 SHA-256: 1963399b6747c4fae04da7d89cff4be6594ba0c52e05af6d5b90ade5ff3801ea

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and specifically triggers heuristics related to the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" directive further indicates an attempt to activate this embedded object, which is a common method for exploiting this vulnerability to achieve arbitrary code execution.

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	3630 bytes
SHA-256: `33362018239bb4741171b0a5771eea8b7ff01e22fa079b580ef6fb1964c06f82`

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