RTF malware analysis — malicious · 8fd53e5f78693bc7

MALICIOUS

RTF

8.7 KB

MD5: e70135cdb555ce99adee7df642813dcb SHA-1: cbdcbfe1426651f5c2fba88872688309e308dd74 SHA-256: 8fd53e5f78693bc7639c94ef4a7969c5395c4e90ae255c0080f687811c8339e6

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that leverages the Equation Editor vulnerability, indicated by the RTF_EQUATION_EDITOR heuristic. The presence of OLE object data and the ".objupdate" directive suggest that the embedded object is designed to be activated, likely to trigger the exploit. The primary goal appears to be the execution of arbitrary code, which is a common precursor to downloading and running further malicious content.

Heuristics 3

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000986.bin` `9dc9f5d7bdde327e5a307d8dc7aaab232732a33600a45e3d7cc94c96ba09a5b0`	rtf-objdata-decoded	RTF \objdata at offset 0x986	1990 bytes

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