RTF malware analysis — malicious · 970aa1ea39079684

MALICIOUS

RTF

1.80 MB

MD5: f4230f83573dbf097b3219588cd656f2 SHA-1: 276874cf73eea9c561525b4f45e23acb84a59e33 SHA-256: 970aa1ea39079684830789ad8c5c9cbf9777b65fdb44130aa8bbe4b88245e6fc

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 triggers the Equation Editor vulnerability, indicating an attempt to exploit a known weakness for code execution. The presence of ".vbs" in the DOC BODY suggests the embedded object is a Visual Basic script designed to download and execute a secondary payload. This is a common delivery mechanism for malware.

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` `aac30ec05026e87de114504a1ee1b48b9d05ab71ecdf202d25da32c83df1793c`	rtf-objdata-decoded	RTF \objdata at offset 0x119B	36379 bytes
`objdata_01_off00020099.bin` `ef0bb09b1fe26f02beb6d60cd6666d2695e11a9b10a3296072737984662626fe`	rtf-objdata-decoded	RTF \objdata at offset 0x20099	418576 bytes

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