RTF malware analysis — malicious · e423db73644b177a

MALICIOUS

RTF

33.4 KB First seen: 2023-07-24

MD5: 762dbe123e50a572a712d62bed017360 SHA-1: b26b0ee27a29531bc6868a10bbb8a2bc13b1b93f SHA-256: e423db73644b177ac6bbe3445932e8d23ed5835b058af257277d73bf0ef9080f

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 Service Execution

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882) via embedded OLE object data. The presence of RTF_OBJAUTLINK and RTF_OBJUPDATE heuristics indicates that the embedded object is designed to be automatically activated upon opening. The SE_ENABLE_LURE heuristic suggests the document also contains text prompting the user to enable editing or macros, a common social engineering tactic. The primary goal appears to be exploiting the Equation Editor to achieve code execution, likely for downloading and running a secondary malicious payload.

Heuristics 5

Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
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_off00004088.bin` `a2a664be9abbe2552dd35204d49fac9eb73bb90c52f0a69d0b1c27b824b96fe4`	rtf-objdata-decoded	RTF \objdata at offset 0x4088	1280 bytes

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