RTF / .DOC malware analysis — malicious · 7b4dd1f8ad728126

MALICIOUS

RTF / .DOC

449.3 KB

MD5: fa157956ddbab95420acb8da46eac6a4 SHA-1: 8b56a35774bdad8a78f998910c5e7969ed5cbae9 SHA-256: 7b4dd1f8ad728126f05c9abf07ad34daf3ff31307f90a8b57cd2cae3c220d4de

192 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an OLE object that is automatically linked and updated, indicating an attempt to exploit vulnerabilities. Specifically, the presence of the Equation Editor CLSID points to a known exploit vector. The embedded OLE object data, when decoded, likely contains malicious code or a downloader. The primary attack pattern involves leveraging the Equation Editor vulnerability to execute arbitrary code, which is then used to download and run a secondary payload.

Heuristics 5

Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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
Suspicious extracted artifact info 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001a52.bin` `f40f8f9e9d5876106fed2fdad9e8b191a283ccbf819c74b277f7e060073e1710`	rtf-objdata-decoded	RTF \objdata at offset 0x1A52	129579 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.

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