RTF malware analysis — malicious · a7ecb7c15301e89d

MALICIOUS

RTF

184.0 KB First seen: 2018-06-19

MD5: 5006868c58c2a3a58c9e8fa5fd47cad3 SHA-1: 8f0723b7ba1f1d3f4bc17f335a5906e4a4ce70e1 SHA-256: a7ecb7c15301e89d6bfaf9da3d1819a3001f3241b5df8ff55e33bbd20be16d1b

320 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object with a CLSID associated with Equation Editor, specifically triggering the CVE-2017-11882 vulnerability. This exploit allows for arbitrary code execution, likely to download and run a secondary payload. The presence of the Ole10Native stream and the specific ClamAV detection signature further confirm the exploitation of this known vulnerability.

Heuristics 7

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
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_off00000041.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x41	63672 bytes
SHA-256: `976c021f87dbbdf94fa5714fbb4c7bd71c7ea27070cfddbe239e6f812795d5e7`

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