RTF malware analysis — malicious · 8f95be1dc0909d58

MALICIOUS

RTF

14.2 KB First seen: 2019-11-20

MD5: f988b759f68c1ccd1ddb192feab255ed SHA-1: 55743a1ce6977e067e701c1b1fff200dde9ae7c0 SHA-256: 8f95be1dc0909d584d9944823260cb7ab4182da2fa7f0b40c573d6a2fa4ac6ff

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that is automatically linked and updated, triggering an exploit for CVE-2017-11882. This exploit is known to deliver a secondary payload, which is likely malicious. The presence of the Ole10Native stream and the specific heuristic firing for CVE-2017-11882 strongly indicate this attack vector.

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_off00000803.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x803	4155 bytes
SHA-256: `1662e36589b79f385656885d721c761d9855e2308f6efd396e3d887014499ab2`

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