RTF malware analysis — malicious · 0b20d40d91927043

MALICIOUS

RTF

36.1 KB First seen: 2023-05-18

MD5: 1024edaea952ddfed7ee9067dd266409 SHA-1: 56b86cc12b63201a23ab3926901501f0aa5680d7 SHA-256: 0b20d40d91927043566ec42d1d44c23bc0522e19defcd366c8354b9ea14db68c

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204 User Execution: Malicious Link T1059.005 PowerShell T1204.002 User Execution: Malicious File

The RTF document contains an embedded OLE object and specifically triggers the Equation Editor heuristic, indicating an attempt to exploit a known vulnerability. The presence of a lure instructing the user to 'Enable editing' further supports the malicious intent. The primary goal appears to be the execution of a secondary payload, likely via the exploited Equation Editor vulnerability.

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_off00004685.bin` `871cc050a72077e97deeea4f1fadf13b8ef4a02172aac9c621e8d28c04af595b`	rtf-objdata-decoded	RTF \objdata at offset 0x4685	1323 bytes

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