RTF / .DOC malware analysis — malicious · c0e14755119fde63

MALICIOUS

RTF / .DOC

56.6 KB First seen: 2023-03-10

MD5: 1afdd92e04049cd5646ed8e0af96b4f3 SHA-1: eb0e3c3d0e879bc78fdc10c0d4146bcc6df1ed2f SHA-256: c0e14755119fde639ecd27739421c246e3526fad19d371de51d9af18930ad0cb

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.005 Visual Basic

The sample is an RTF document containing an OLE object that leverages the CVE-2017-11882 vulnerability in Microsoft Equation Editor. The presence of ` tf_objautlink` and ` tf_objupdate` indicates that the embedded OLE object is designed to be activated automatically, likely to download and execute a secondary payload. The document body contains a lure to 'Enable editing', a common tactic for macro-enabled malicious documents.

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.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
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_off00002171.bin` `f40347dcdd3bc26e7ce29248a2a7e84741ece7ef0ed4a2e3ecf69de56c2c837d`	rtf-objdata-decoded	RTF \objdata at offset 0x2171	4160 bytes

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