RTF malware analysis — malicious · 39bbdaec781f6234

MALICIOUS

RTF

17.4 KB First seen: 2019-03-18

MD5: 33548e20ac94d75d4078f646a53f2da1 SHA-1: 54cc99f6a32b089f8c0020695fcabbc5cd36d355 SHA-256: 39bbdaec781f6234f8c3dda8de62cf410f5a994cccf3c6889373fef7f169ebca

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains heuristics indicating the exploitation of CVE-2017-11882 via an embedded OLE object. This vulnerability is commonly used to execute arbitrary code, suggesting the file's primary purpose is to deliver a malicious payload. The presence of RTF_OBJDATA and RTF_OLE10NATIVE_STREAM further supports the embedding of executable content.

Heuristics 5

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.
\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_off00000ef2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEF2	4664 bytes
SHA-256: `88733139d2d91d5f8eb11aa1d55e85244c8c4de0aebd0b4df1c8a4359f76d88c`

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