RTF / .DOC malware analysis — malicious · 4a97062cd26aaa64

MALICIOUS

RTF / .DOC

445.9 KB

MD5: 7eb650183d4d3a9c79d897d11d54547d SHA-1: 7a4f83f1fcacc6402032bdc309dd91d3e36c2549 SHA-256: 4a97062cd26aaa6430826f03ab22cd25668218b53b34c374e885e5820ee264f2

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution: Malicious File

The RTF document contains an embedded OLE object that is automatically updated and activated, indicating a likely exploit. The critical RTF_EQUATION_EDITOR heuristic strongly suggests the use of the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is commonly used to download and execute a second-stage payload. No specific family could be identified, but the attack pattern is consistent with exploit-laced documents.

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_off00001e8b.bin` `3255bb2c13b7f23a00d972a88705093b9e20739ae233f43b9e64ef1e8e8a38f4`	rtf-objdata-decoded	RTF \objdata at offset 0x1E8B	64073 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.93, consistent with packed or encrypted content.

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