RTF malware analysis — malicious · f5a5a168a7df8555

MALICIOUS

RTF

19.2 KB First seen: 2018-09-04

MD5: 3f5a567af7be34f97d9b5317df4d2e77 SHA-1: a54c3a6cc554e4c27dda487b6c0b49d92b436b0d SHA-256: f5a5a168a7df85559a09ad9c76b6042806520c3bbe2957f8c52707e1c57bdbbd

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an OLE object that leverages the CVE-2017-11882 vulnerability in the Equation Editor. This vulnerability is known to be used for arbitrary code execution, likely to download and execute a second-stage payload. The presence of the ".bin" file in the embedded artifacts further supports the delivery of a malicious payload.

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00001679.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1679	4658 bytes
SHA-256: `cb33726068b2f3349780db52173677c7541df5de9cdedce409801fa64601530b`

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