RTF / .DOC malware analysis — malicious · 46c1c6577cd8eb7f

MALICIOUS

RTF / .DOC

1.75 MB

MD5: 4a34426d3fdacbc53632b361baadd8f8 SHA-1: 82a6c48c59039a4eb500d0fe7ace041d683b5bd7 SHA-256: 46c1c6577cd8eb7f5dacb8f71da27ef0a2d2f1b6ee744878b468ad51eaeb27e1

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object with a ProgID indicative of Equation Editor, triggering heuristics related to CVE-2017-11882. The presence of a large, high-entropy decoded OLE object suggests it hides a second-stage payload. The objupdate directive further indicates an attempt to automatically activate the embedded object, leading to exploitation.

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 ~1831KB 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_off00000089.bin` `c42b298dd9f038c17209224a20cee4c36d4312d59255d9f3920c08d18ecf25eb`	rtf-objdata-decoded	RTF \objdata at offset 0x89	915688 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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