RTF / .DOC malware analysis — malicious · ee5dbcc7edeaa326

MALICIOUS

RTF / .DOC

1004.5 KB

MD5: c1cbd9674d9bc10e8af17443ad75977a SHA-1: 88a8fd7e22baba95cbfb498c450faec697ece03c SHA-256: ee5dbcc7edeaa3262462b22091403b94fdb1565e5cf656794dd55a527223778f

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 an embedded OLE object with a ProgID indicative of Equation Editor, triggering critical heuristics for CVE-2017-11882. The presence of a large, high-entropy OLE1 native payload strongly suggests it decodes to a second-stage executable. The objupdate directive further indicates an attempt to automatically activate the embedded object, likely leading to the execution of the embedded payload.

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 ~1028KB 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_off000000bb.bin` `66ee96e294d24e23f42a6bdba6cefef610802e602c63e090c05374ee0c69a020`	rtf-objdata-decoded	RTF \objdata at offset 0xBB	514089 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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