RTF malware analysis — malicious · e7ddb253f3fdb6f5

MALICIOUS

RTF

14.2 KB First seen: 2019-04-18

MD5: e4b45d24c8a23a1ef361d02ea6c0dc8f SHA-1: 6f3012aa83e8dc7ab499f662c3375b0aa5f111cb SHA-256: e7ddb253f3fdb6f53c312b8f5e11a2825ad376357f658390c246997fded7d7c2

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that leverages the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit is designed to execute arbitrary code, likely to download and run a second-stage payload. The presence of the OLE object and the specific heuristic firings strongly indicate exploitation of this known vulnerability for client execution.

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.
\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_off000007ff.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7FF	4155 bytes
SHA-256: `5d141e8aeb2e7262c68f6268200fd62be6b236457b41fdb092da67cb67df9298`

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