RTF / .DOC malware analysis — malicious · da434e7b01c61143

MALICIOUS

RTF / .DOC

1.65 MB

MD5: 892a39a80151a52f1a064cea015f270a SHA-1: 9973ee6ad2dcef375b1b3308da66a879a9df37e8 SHA-256: da434e7b01c61143d440d75ccd8ad7136f030a43d9cdeaad377c443875a31744

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object with excessive hex data, indicative of a hidden payload. The critical RTF_EQUATION_EDITOR heuristic strongly suggests exploitation of the Equation Editor vulnerability. The ".objupdate" directive further points to automatic activation of the embedded object, likely to trigger the exploit. This mechanism is commonly used to download and execute a second-stage payload.

Heuristics 6

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 ~1722KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off00000e35.bin` `1e951975b9ea16dbfb717ba9b23fb30d92d15f3c26eff89a0f62de3b3348974c`	rtf-objdata-decoded	RTF \objdata at offset 0xE35	861392 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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