RTF malware analysis — malicious · dcf255d7a41f4c69

MALICIOUS

RTF

14.2 KB First seen: 2019-01-25

MD5: 4e1e50db6fb0dbedcf9bb19a758341b0 SHA-1: 8c9542c09ac6bbf95e59f41eb243f7af3572fa07 SHA-256: dcf255d7a41f4c69a41c37108535dd75e4379f8b20b39004c60e565215e43dc2

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_off00000804.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x804	4135 bytes
SHA-256: `7084ce32cb027b454922624b504b80732114ff45c006d54163eeb724ddbaa439`

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