RTF / .DOC malware analysis — malicious · 44f59e8e47e9d8b0

MALICIOUS

RTF / .DOC

64.8 KB

MD5: 632694c95085a53e76ae646146a8186e SHA-1: 92a3756e3a351095220a612a798dc08375e18b97 SHA-256: 44f59e8e47e9d8b0a377b5b7402ed4d862156d07912db0e78d512d385d02077f

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 OLE object with a ProgID indicative of Equation Editor, triggering critical heuristics for CVE-2017-11882. The ".objupdate" directive suggests that the embedded OLE object is automatically activated upon opening the document. A high-entropy MZ executable artifact was carved from the OLE object data, indicating it likely contains a second-stage payload. No document body text was available for analysis, but the heuristics strongly suggest exploitation of CVE-2017-11882.

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 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_off00000058.bin` `2be86b461fcb0c574c6c9e730ddddf222210d60119708e9a4438ae8c42b9327f`	rtf-objdata-decoded	RTF \objdata at offset 0x58	33023 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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