RTF malware analysis — malicious · 7b0876977d9b2e85

MALICIOUS

RTF

32.5 KB First seen: 2023-07-03

MD5: 4f5cf5fbe9efe99aa65e82f460640ffa SHA-1: 80cdc361392dca635fe24c7e37c3d4e360ed0e52 SHA-256: 7b0876977d9b2e8562e8b95a67ce01c658371dc1cac1b4f58a3eb25007cf7bc5

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 PowerShell

The RTF document contains an embedded OLE object with a split Equation Editor ProgID, indicating an attempt to exploit the Equation Editor vulnerability (CVE-2017-11882). The \objupdate directive forces OLE activation, and the document includes a lure instructing the user to 'Enable editing', a common tactic for macro-based malware. The exploitation likely leads to the execution of a secondary payload.

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_off00004615.bin` `242c508ffe3899df8dd61cab0a9bb00505bd6a5f3061f8d7bd82b1d91c8bcc13`	rtf-objdata-decoded	RTF \objdata at offset 0x4615	1609 bytes

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