RTF / .DOC malware analysis — malicious · 9ac32081e37189ac

MALICIOUS

RTF / .DOC

682.7 KB

MD5: 2e7c6287078304f0b229bc32254036b8 SHA-1: 649dd57b1711c8df83e5519889aa7b5dca917d5c SHA-256: 9ac32081e37189ac21029ca741677c9ec71a7f3ea06e4c52289dd3e8136f1bce

182 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.001 Component Object Model T1059.003 Windows Command Shell

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The ".bin" artifact extracted from the OLE object exhibits high entropy, suggesting it is a packed or encrypted executable. The presence of ".objdata" and ".objupdate" sections further indicates the exploitation of OLE object handling within the RTF format. The primary attack vector is the exploitation of CVE-2017-11882 to deliver a secondary payload.

Heuristics 5

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 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_off000012ee.bin` `173e43ea995158b097cdf943540b15c0e30a84eb2985d5cd342c29059cc4b0ff`	rtf-objdata-decoded	RTF \objdata at offset 0x12EE	173527 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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