RTF malware analysis — malicious · 9483f07f98de16e3

MALICIOUS

RTF

16.8 KB First seen: 2018-10-07

MD5: afae4735d2945e5509885601036741ea SHA-1: a07bb4c3e53ca2395972f3297f7b3187e8d6d517 SHA-256: 9483f07f98de16e3f7e146ea46c2dd4efbbe3013c32a2f5e4eaa9bbc6a040ad3

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains critical heuristics indicating the exploitation of CVE-2017-11882 via an embedded Equation Editor OLE object. This exploit is commonly used to deliver secondary payloads. The presence of Ole10Native stream data further supports this finding. No document body or script content was available for analysis, but the exploit itself is sufficient evidence of malicious intent.

Heuristics 6

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.
\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_off00000cd6.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCD6	4666 bytes
SHA-256: `e7225690e6cc28c0a43de8d689ea022fb6769592bd1471797fa4a6b8dcf4de20`

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