RTF malware analysis — malicious · bb3f220d5cca0225

MALICIOUS

RTF

17.5 KB First seen: 2022-10-10

MD5: 77c4d798b177bf7c7ca98860b88c5a46 SHA-1: 670ec8a0168858bf18deffd83192aee4bf9f7997 SHA-256: bb3f220d5cca02255f1bada7709cb858989af3108e0b0679955b57d30e6969db

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The RTF document contains an OLE object with embedded data that is indicative of the CVE-2017-11882 Equation Editor vulnerability. The presence of `RTF_OBJAUTLINK` and `RTF_OBJUPDATE` heuristics suggests that the embedded object is designed to be automatically activated upon opening the document. This exploit is commonly used to download and execute arbitrary code, likely a second-stage payload.

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_off000012ea.bin` `21fcb3f3707836b006eae9957cc7dbb979b6aaa929850b66531ecec088e98a2c`	rtf-objdata-decoded	RTF \objdata at offset 0x12EA	3658 bytes

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