RTF malware analysis — malicious · 9a93faf5e2655e6b

MALICIOUS

RTF

44.8 KB First seen: 2023-07-26

MD5: c9fc4258a331cae34e2481fd662099bd SHA-1: 8b9b2aab582daa066df37da6b943da6bfcf948d4 SHA-256: 9a93faf5e2655e6be04da3a195d6221636a6adeba3c65df56f2fbd5ec77b1f3f

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 PowerShell

The RTF file contains an embedded OLE object with data indicative of the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" directive forces the activation of this object, triggering the exploit. The document body contains a lure to "Enable editing", suggesting the user interaction is required to initiate the exploit chain. The primary goal is likely to achieve code execution for downloading and running 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_off00004dbd.bin` `8d85a61ee07f9b8a7e425ed2e9d26ca2bb0efba7a8736c1ddacf1b327a125b87`	rtf-objdata-decoded	RTF \objdata at offset 0x4DBD	1821 bytes

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