RTF malware analysis — malicious · aa3cf6cca9a6b711

MALICIOUS

RTF

39.1 KB First seen: 2023-07-18

MD5: ce8cdd4546f3c1d22d3c0c3834c2a73b SHA-1: a2aaeef225ee75044c04e604f7492151777756ff SHA-256: aa3cf6cca9a6b711b17a92b8fa323514b0926971babfa48f6997661f5bf5e5b8

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains embedded OLE object data and specifically triggers ".objupdate" which forces OLE activation. The presence of a split Equation Editor ProgID strongly suggests exploitation of CVE-2017-11882. The document body includes a lure instructing the user to 'Enable editing', a common tactic for macro-based malware droppers.

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_off00005a10.bin` `5c3892c00b681f7509b989305df91973f9363ae0af0eb13068fc7b25deca168d`	rtf-objdata-decoded	RTF \objdata at offset 0x5A10	1293 bytes

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