RTF malware analysis — malicious · 0a83a66a638007b4

MALICIOUS

RTF

91.6 KB First seen: 2024-07-21

MD5: 034e661a8a618c2a1596205d982f769d SHA-1: 181667161e04c2b4336706a09567975979388ce4 SHA-256: 0a83a66a638007b4d23dbe6c6a766ac1c95dc80fcbd7adc4b6f81ec8b3a50885

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating an attempt to exploit a known vulnerability. The \objupdate directive suggests that the OLE object is automatically activated upon opening the document. This is a common delivery mechanism for malware, likely intended to download and execute a secondary payload.

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_off00001626.bin` `0624662ecdbaaf6d7b3029bf6f6371d9e37d0d54055194fbb42ceab74a465937`	rtf-objdata-decoded	RTF \objdata at offset 0x1626	1682 bytes

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