RTF malware analysis — malicious · d77f2828a9d5a1bd

MALICIOUS

RTF

255.8 KB First seen: 2018-06-21

MD5: 306d9c2b14cdcbe978a758f078200300 SHA-1: a5b87232ea02f258ab9f180659a56ea9ce6f82f3 SHA-256: d77f2828a9d5a1bd1970459dd939ebb9c2f9ef3fe4f500dae4516c35e8213302

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document containing an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for the execution of arbitrary code, which is likely used to download and run a secondary malicious payload. The presence of the Ole10Native stream and objdata further indicates 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.
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_off00000cfc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCFC	74760 bytes
SHA-256: `5528cd56943d928144a3621aa3917615c0a988ce806da002367fcd951e0fa123`

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