RTF malware analysis — malicious · 38015c6d293da444

MALICIOUS

RTF

10.5 KB First seen: 2019-11-20

MD5: da84fc2e7ce3551db6a8a774939b5553 SHA-1: 39d38393422f7045553e336cd759ee855e30680d SHA-256: 38015c6d293da444cd52f35299edb4570a1b515361d518da4ac344e0f4b09ae4

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and triggers an \objupdate command, indicating an attempt to exploit the Equation Editor vulnerability. This exploit is commonly used to download and execute a second-stage payload, leading to a malicious outcome.

Heuristics 3

Split hex Equation Editor ProgID + OLE object critical CVE likely 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001bd8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1BD8	1798 bytes
SHA-256: `5c3bb447b9d2400458ef02cb5a71a0fab877dee84ffd79d8358719534eaa43de`

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