RTF / .DOC malware analysis — malicious · 90572404433c6ba5

MALICIOUS

RTF / .DOC

1.07 MB

MD5: 6353ad0484316bd0d808ac253ea3d6f8 SHA-1: ce7f5a270c79e8d2385d428b2423f4624673a9d3 SHA-256: 90572404433c6ba508bcb6401d41a692e659807741a340ddb274dc03ee0181da

222 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains multiple indicators of maliciousness, including OLE object data and specific firings for RTF_EQUATION_EDITOR and CVE_2017_11882_RELATED. These heuristics strongly suggest the exploitation of the Equation Editor vulnerability (CVE-2017-11882) to deliver a secondary payload. The presence of a large, high-entropy OLE object further supports the hiding of an executable payload within the document.

Heuristics 6

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1112KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00001038.bin` `21b5887ea9cbf90bbf46fdf0df3c5f7560de13ac83265efc8cf35e0f34203750`	rtf-objdata-decoded	RTF \objdata at offset 0x1038	556131 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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