RTF malware analysis — malicious · 336820dc0bb9f567

MALICIOUS

RTF

18.6 KB First seen: 2019-02-26

MD5: 0b9c929d413f3960b1951c93e3bf352b SHA-1: 508b39ccfb9c823949d8643641f9b84779496ff9 SHA-256: 336820dc0bb9f56753ca2ebca1571fde80ff63a385def683c141f0ebc1d35556

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data, specifically identified as a payload for CVE-2017-11882, which is a known vulnerability in Microsoft Equation Editor. This exploit is designed to execute arbitrary code, likely leading to the download and execution of a secondary malicious payload. The presence of ".objupdate" and ".objautlink" directives further indicates an attempt to automatically activate the embedded OLE object upon opening the document.

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_off00001a76.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1A76	4131 bytes
SHA-256: `46ab6652134641bc56a2e9ec50399f0bd8e24b81ca48a57fe310fa7a16be0ee1`

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