RTF malware analysis — malicious · a2cbc877faf1167a

MALICIOUS

RTF

968.1 KB First seen: 2018-06-30

MD5: d37ba55240dcd22e0eadd1cd6d3d6138 SHA-1: 4001d94c6bc1dd15913a5629d548ad4d6d886f87 SHA-256: a2cbc877faf1167abc921b2aec3a0effe44a83ca1020fca2c3e96c21944b986b

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an OLE object with an Ole10Native stream, strongly indicating the exploitation of CVE-2017-11882 in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the embedded object is activated. No document body or script content was available for further analysis.

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_off0000003e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3E	4150 bytes
SHA-256: `cf22b746ffb16b0b21ec08cd69fe8846da19cfedca0ffa5935ccef556c9843f4`

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