RTF malware analysis — malicious · e5506151004fb2bc

MALICIOUS

RTF

1.80 MB

MD5: fdeb0e464d28dffb8a6af124394c3603 SHA-1: 5870451a561fc8756e967489a72a8425f37c75ef SHA-256: e5506151004fb2bc61a295691922fb4501b5fcd02447ab2ba85fd75cd5f2e90f

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains embedded OLE objects and specifically targets the Equation Editor, indicating an exploit attempt. The presence of ` tfobjupdate` suggests that the embedded object is designed to be activated automatically. The extracted document body contains obfuscated VBA-like code that appears to be designed to execute further commands or download additional content, likely leveraging the Equation Editor vulnerability (CVE-2017-11882) to achieve code execution.

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 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000119b.bin` `9919bc270efd162d9993bd8208f4c377bde96a0089395393df87b0ddf9131268`	rtf-objdata-decoded	RTF \objdata at offset 0x119B	36357 bytes
`objdata_01_off0002006d.bin` `ef0bb09b1fe26f02beb6d60cd6666d2695e11a9b10a3296072737984662626fe`	rtf-objdata-decoded	RTF \objdata at offset 0x2006D	418576 bytes

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