RTF malware analysis — malicious · 542fb0e314df639a

MALICIOUS

RTF

415.9 KB First seen: 2024-12-13

MD5: 356f30ba570428a6d0896e3960de8b70 SHA-1: 5120621ec0a2eecb692f8042d1f6789a8bb182d8 SHA-256: 542fb0e314df639a7eef7ff077ddfd9574e70fb5ed5cbaf31c44d97f77e0c43c

160 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model

The RTF file contains multiple OLE objects, including one specifically identified as being related to Equation Editor. The presence of \objupdate indicates an attempt to force OLE activation, which is a common technique for exploiting vulnerabilities like CVE-2017-11882. The extracted artifact objdata_00_off000000fd.bin is likely the payload or exploit code.

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` `b2837320d899a25a1aefb1b892b629203e3d10bd1981e5b53f1c855fa8a912bc`	rtf-objdata-decoded	RTF \objdata at offset 0xFD	207830 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00067152.bin` `d7f93b4495291d229e0f2245ff16ff35f6d28a5bf33ad0adfe599ef1386a08f7`	rtf-objdata-decoded	RTF \objdata at offset 0x67152	1726 bytes

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