RTF malware analysis — malicious · 3cdc3cf389491e9a

MALICIOUS

RTF

298.6 KB First seen: 2020-06-01

MD5: e74e20a56cda29336cf52c54d51bb9c2 SHA-1: 43ed60a9623a092b1052a3e2f6f1d0cab5e6830e SHA-256: 3cdc3cf389491e9acf3299db4e4e9aa28739a930d73b653b685dbe1c75aa2050

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an OLE object with characteristics strongly indicating exploitation of the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution, enabling the delivery of a malicious payload. The presence of ` tf_objdata`, ` tf_objautlink`, and ` tf_objupdate` heuristics further supports this attack vector. The document body is heavily obfuscated and does not provide further insight into the specific lure.

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_off000015e1.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x15E1	87695 bytes
SHA-256: `c96b4794d39f9f00ab4136a8d77a638218070cd08c0210673d8fa0dc0a82f4a8`

Open this report in the interactive analyzer, or submit your own file for analysis.