RTF / .DOC malware analysis — malicious · 2788cb7d18ebe46f

MALICIOUS

RTF / .DOC

810.5 KB

MD5: 49b9147b2fa23f5eed44138dfa181698 SHA-1: f6ab77e7c8b0d5bf35684751bc1c83f8acda5c6d SHA-256: 2788cb7d18ebe46f004f2fc971e90142c17ab414100cffee728dcfa5d93b2e68

182 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains an embedded OLE object with a ProgID indicative of Equation Editor, triggering the CVE-2017-11882 exploit. The heuristic firings confirm the presence of OLE object data and specifically flag the Equation Editor exploit. The ".objupdate" directive forces the activation of this embedded object, leading to the execution of the malicious payload. The high entropy of the carved artifact suggests it is likely an executable.

Heuristics 5

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
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 2 \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_off000000bf.bin` `6737d51939bcb6b334f7cc5b9b20884d8a7e587fd91a32d63d71e20c590c4ee9`	rtf-objdata-decoded	RTF \objdata at offset 0xBF	414763 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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