RTF malware analysis — malicious · 7604b60990297c5b

MALICIOUS

RTF

50.4 KB First seen: 2023-08-04

MD5: 50dc985e3749a03e19cad19ecf48888e SHA-1: b800887d75f8cfe2f55541e7d201e94e46ca8ab1 SHA-256: 7604b60990297c5b6f34db41501c0297dbeac0f303377ccc92c4092579b2c846

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204 User Execution T1204.002 Malicious File

The RTF file contains an embedded OLE object, specifically targeting the Equation Editor vulnerability, and uses an \objupdate directive to force OLE activation. The document body provides a lure explaining internal controls and auditor opinions, instructing the user to 'Enable editing', which is a common tactic for malware droppers to bypass security measures.

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_off00002d60.bin` `3fe1d2a0f69f4ce6bda296c200d7912bc8af42f1e86b2e77a614f4c4d530d2a1`	rtf-objdata-decoded	RTF \objdata at offset 0x2D60	1759 bytes

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