RTF / .DOC malware analysis — malicious · 327de1f64dd092c4

MALICIOUS

RTF / .DOC

301.6 KB

MD5: 54d03c9cd31d7b345ec240e5b5e4c512 SHA-1: ab9dc1e77bf1338906b8488e6fd0da59d5ca13e3 SHA-256: 327de1f64dd092c41e96ddb5b4e23c227ee64c19b49b3de7dd07711e810b8e50

202 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link: Malicious File

The sample is an RTF document that exploits the Equation Editor vulnerability (CVE-2017-11882) via an embedded OLE object. This exploit is known to deliver second-stage payloads. The high entropy of the extracted OLE object suggests it is likely an executable. The attack pattern is consistent with a malicious document designed to drop and execute further malware.

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.
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_off00001934.bin` `23ac70e12f6577aca6ae6b68b06825296db76c17dd3ddc8114b8798c5e26bf33`	rtf-objdata-decoded	RTF \objdata at offset 0x1934	100576 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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