RTF malware analysis — malicious · a3283520e04d7343

MALICIOUS

RTF

407.3 KB First seen: 2024-12-13

MD5: ef00004a1ebc262ffe0fb89aa5524d42 SHA-1: 05ebfd620475269c1228f87048c237a276745f1f SHA-256: a3283520e04d7343ce9884948c5d23423499fa61cee332a006db73e2b98d08c3

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF file contains multiple embedded OLE objects, including one specifically identified as being related to Equation Editor. The presence of \objupdate indicates that the embedded object is designed to be activated automatically, likely triggering the execution of a malicious payload. The extracted artifacts suggest a secondary stage 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` `a11b839cb57506c7c704a790f88545c93008f13e802f0395153f39bc1dd259a1`	rtf-objdata-decoded	RTF \objdata at offset 0xFD	203427 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00064eec.bin` `d7f93b4495291d229e0f2245ff16ff35f6d28a5bf33ad0adfe599ef1386a08f7`	rtf-objdata-decoded	RTF \objdata at offset 0x64EEC	1726 bytes

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