RTF malware analysis — malicious · fa6dd8029bdcb31c

MALICIOUS

RTF

19.3 KB First seen: 2018-09-04

MD5: 5dbd161b95a632147f4b7259763420d7 SHA-1: b9349e2045f135c7897bda55460452e38ce48967 SHA-256: fa6dd8029bdcb31ccbae656bcca8aa1f42a61587f200864a27ee351a412791c7

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 leading to the download and execution of a secondary payload. The presence of the Ole10Native stream and the objupdate heuristic strongly indicate an attempt at OLE object activation for exploitation.

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_off00001675.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1675	4658 bytes
SHA-256: `c270857519fb56df0a8d4f77a38c0d94880dadbd773275d9fe4378e191ed3ca1`

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