RTF malware analysis — malicious · d20cb1df95bcd246

MALICIOUS

RTF

18.2 KB First seen: 2022-10-04

MD5: 14b38a718b0ad26b84cf4566a0570a56 SHA-1: 50b461d4af7774c7dc8bab6f4f2b951a80b03a04 SHA-256: d20cb1df95bcd246f37fa1be7080098ce9aac0a94c79f32ba4d820e1991b3448

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter

The sample is an RTF document containing an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). The presence of `RTF_EQUATION_EDITOR` and `RTF_OBJUPDATE` heuristics indicate this exploit is present and configured to activate. The `SE_ENABLE_LURE` heuristic suggests the document prompts the user to enable content, a common social engineering tactic to bypass security measures and trigger the exploit.

Heuristics 4

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.
\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_off00001f97.bin` `c2eb6df26069b923a0284bb7d98e8f40d0c1e8856cd0e045e273dac6dfcda843`	rtf-objdata-decoded	RTF \objdata at offset 0x1F97	1928 bytes

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