RTF malware analysis — malicious · 8f451258081e7e6f

MALICIOUS

RTF

1.14 MB First seen: 2018-06-21

MD5: 0dbe025e6932b895a685379c22b967f2 SHA-1: 9d157c6d433059c0b959a12ee66fc24eb8dc5dd2 SHA-256: 8f451258081e7e6fcbb19ca42d006ed2f3bac74f88cbb1b972ec6b60c75cf9c8

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an OLE object with a critical heuristic indicating exploitation of CVE-2017-11882. This vulnerability is commonly used to execute arbitrary code. The presence of excessive hex-encoded data within the OLE object further suggests a hidden payload. The document body's text is minimal and appears to be a generic ticket closure message, providing no additional context.

Heuristics 6

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1193KB of hex-encoded data inside \objdata sections — may hide a payload
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_off000000d0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xD0	4670 bytes
SHA-256: `b9940600501403967ff65b93955a868f4fe069d08b7bd536b02d90273bd17ed1`

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