RTF malware analysis — malicious · 0c0134da989b3090

MALICIOUS

RTF

7.1 KB First seen: 2018-06-25

MD5: 2e3361e3f6c95c15daa5e78b6e8cecfe SHA-1: 683b681d18316d38a6063682d0fc58ceb9edf41b SHA-256: 0c0134da989b30901b6b057a01ec89adf4196b339cb15ec545c8a53ebbe59f6a

300 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that leverages CVE-2017-11882, a critical vulnerability in Microsoft Equation Editor. This exploit allows for arbitrary code execution when the document is opened. The file's structure and the specific heuristic firings strongly indicate this exploit is the primary function.

Heuristics 7

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
Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE

RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
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
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_off0000003b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3B	3624 bytes
SHA-256: `9c4210c1b6d6baa3798cbbbfcc09328efc98b4dba1a62733a99ebae2840d10be`

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