RTF malware analysis — malicious · 4db0a2d4d011f439

MALICIOUS

RTF

407.2 KB First seen: 2024-12-13

MD5: 6c7d24b90f3c6b4383bd7d08374a0c6f SHA-1: 33657ac7b0b7793c21a5a1ea6a78c72fa48857e1 SHA-256: 4db0a2d4d011f43952615ece8734ca4fc889e7ec958acd803a6c68b3e0f94eea

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains multiple OLE objects, including one specifically identified as being related to the Equation Editor vulnerability. The \objupdate directive forces the activation of these embedded objects, indicating an attempt to exploit the Equation Editor to execute arbitrary code. The extracted artifacts suggest a secondary payload or exploit stage.

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 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000fd.bin` `89c27992607768f24336f79b0408e27a367d4d6c77247068f21b7d63bb47376b`	rtf-objdata-decoded	RTF \objdata at offset 0xFD	203402 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00064eba.bin` `d7f93b4495291d229e0f2245ff16ff35f6d28a5bf33ad0adfe599ef1386a08f7`	rtf-objdata-decoded	RTF \objdata at offset 0x64EBA	1726 bytes

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