RTF / .DOC malware analysis — malicious · b449ab041a473f2e

MALICIOUS

RTF / .DOC

299.9 KB

MD5: e45d33054e9ec271f8eeaa25cc16ca69 SHA-1: cf44946e1d335686c05425a2aca70b9168a9b99f SHA-256: b449ab041a473f2e669607a079241cd61125acbe44ee9ee0dfc67e701ba7d9cf

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing an OLE object with a split Equation Editor ProgID, indicating exploitation of CVE-2017-11882. The ".objupdate" directive forces OLE activation, which is likely intended to trigger the exploit and execute a second-stage payload. The presence of OLE object data and the specific Equation Editor exploit pattern strongly suggest a malicious document designed for initial code execution.

Heuristics 5

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00000061.bin` `6ad755b10b94798f7a558da583ae20ddb6a49295b49fa46e863ca74aaec1d5e4`	rtf-objdata-decoded	RTF \objdata at offset 0x61	153439 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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