RTF malware analysis — malicious · d99dfd92b5c40e3b

MALICIOUS

RTF

80.8 KB First seen: 2023-08-17

MD5: 0a9e957fde98ba310068531d77c46385 SHA-1: a4af19fba1e358c1a303f3cc1a729b85f19192f3 SHA-256: d99dfd92b5c40e3bceb1e79f0f8628f9b872d18062a7ff1e97cb395af0c9b381

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample 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 for macro-based malware droppers. The presence of RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics strongly indicates exploitation of the Equation Editor vulnerability.

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 1 \objdata section(s) — embedded OLE objects
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_off00002f67.bin` `9e719ffbce94df9b5d054363c779a8722580ff97469768c1b2f27855bce9d324`	rtf-objdata-decoded	RTF \objdata at offset 0x2F67	1562 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.