RTF malware analysis — malicious · 3a455a78fa7b3fc2

MALICIOUS

RTF

44.4 KB First seen: 2023-07-10

MD5: 1317cd4790b40e8aa19a99af1fe8dadb SHA-1: c4923caaa765b41345146a7bc5ef4ea80b715c12 SHA-256: 3a455a78fa7b3fc2bbc6432193ad7868e7de7bc53e70c8ad22f83b8d343e664f

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object and an ".objupdate" directive, indicating an attempt to trigger OLE activation. The presence of RTF_EQUATION_EDITOR heuristics suggests exploitation of the Equation Editor component. The document body includes a lure to 'Enable editing', common for macro-based or exploit-driven document attacks. The primary goal appears to be exploiting a vulnerability via the embedded object to execute a payload.

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_off000052e8.bin` `53460acf7f20808ec15befe6eae768cc4d8baaeda85b10918436f488743ff0bc`	rtf-objdata-decoded	RTF \objdata at offset 0x52E8	1925 bytes

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