RTF malware analysis — malicious · 2a547c21978e274b

MALICIOUS

RTF

19.2 KB First seen: 2018-09-04

MD5: 77de1e330c524fbeb192125189513b0a SHA-1: cfd1db1acf07ffab8fdb055aa316c225bf251558 SHA-256: 2a547c21978e274b90250bd00cfc94b82f7a9b0cf4a6a0e0bff90f94f7792970

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: `183b7ba075f643bc3e6de1265036ddc52ba3e2530fee904614beb327b79d4209`

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