RTF malware analysis — malicious · d7aca49508336bd0

MALICIOUS

RTF

45.0 KB First seen: 2023-08-06

MD5: f4c7f6f75b0bd401889447acb3d9c91b SHA-1: 1b5f9cd58bc817eebe91275b55558a2b11508af8 SHA-256: d7aca49508336bd02576d53e3808504befccf7b241fe99ce0193fb74d81205d4

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing an embedded OLE object that exploits a vulnerability in the Equation Editor. The document body contains a lure instructing the user to 'Enable editing', which is a common tactic to bypass macro security settings and trigger the exploit. The exploit likely leads to the execution of a secondary payload.

Heuristics 5

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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00003194.bin` `deb9b896109bef210fad05f01ef7f355a5af61d290b58b399eb7765c7eecc7c7`	rtf-objdata-decoded	RTF \objdata at offset 0x3194	1496 bytes

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