RTF malware analysis — malicious · e1af80247c99ce2b

MALICIOUS

RTF

411.9 KB First seen: 2024-12-13

MD5: ffa6d53576ea58f862aa47f31f31d01e SHA-1: ae0c9408673f941a2b353b7dda9a1a041273f66f SHA-256: e1af80247c99ce2b38836edac0a2874b649148ce657fcce1538756cf8c887fc9

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 presence of \objupdate directives indicates an attempt to force the activation of these embedded objects, likely leading to the execution of a malicious payload. The extracted artifacts suggest a secondary payload was embedded within the RTF.

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` `a615703bd403696452bdd28f2598d0bd18974e040da5182c986bb625fe680ddf`	rtf-objdata-decoded	RTF \objdata at offset 0xFD	205812 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0006618e.bin` `d7f93b4495291d229e0f2245ff16ff35f6d28a5bf33ad0adfe599ef1386a08f7`	rtf-objdata-decoded	RTF \objdata at offset 0x6618E	1726 bytes

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