RTF / .DOC malware analysis — malicious · fb7608a842cd42a8

MALICIOUS

RTF / .DOC

18.2 KB First seen: 2022-08-29

MD5: c45d9dc1f72380303db75bfbf734d0cb SHA-1: 1bd04630c8b7a838d8d2d601cd3618e861e89c5c SHA-256: fb7608a842cd42a82ef24cfbeae145dc9bc4b76cb7bbf1e30994213511fdca2e

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204 User Execution T1059.005 PowerShell T1059.001 PowerShell T1059.003 Windows Command Shell

The file is an RTF document containing an embedded OLE object that exploits CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. The document body contains a lure instructing the user to 'click enable editing to view in readable format', which is a common technique to bypass macro security settings and execute malicious content. The presence of the Ole10Native stream and the specific CLSID strongly indicate exploitation of this vulnerability.

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.
\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 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001b33.bin` `c7ca45156dcbca69778f43cf8860e0d9fcbf59def480b05a098dea1284b91ac7`	rtf-objdata-decoded	RTF \objdata at offset 0x1B33	3735 bytes

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