RTF malware analysis — malicious · 70c8d1f9273a91c6

MALICIOUS

RTF

8.1 KB First seen: 2018-07-23

MD5: 74e8bfb0a9931368ac0ac4f905894358 SHA-1: a4a5a5a14346d7d40d2802507f4b20e6b3eceb41 SHA-256: 70c8d1f9273a91c6d2d9526158601b5fd2ef46660e88921c9fa0cdb2770f0a2b

300 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object with a CLSID indicative of Microsoft Equation Editor. Critical heuristics confirm the presence of a payload exploiting CVE-2017-11882, a known vulnerability in Equation Editor that allows for arbitrary code execution. The file is identified as malicious by ClamAV with a specific signature for this exploit.

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
\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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000003b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3B	4136 bytes
SHA-256: `433715f6ea656d66f46c46d0bac31865bbc195bef3327dc1c51ad7de7c406fe8`

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