RTF / .DOC malware analysis — malicious · 34cb78b59b227613

MALICIOUS

RTF / .DOC

447.3 KB

MD5: 772a91f26780d326bfb4fb1c7de241a8 SHA-1: d35767d634adee1891de8edfc44e3f308b574397 SHA-256: 34cb78b59b227613e3166516873fb54cb599444d399a2531238077808f72a286

202 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.001 Component Object Model T1059.001 PowerShell

The sample is an RTF document that contains an embedded OLE object, specifically triggering the CVE-2017-11882 exploit. This exploit is known to be used for delivering second-stage malware. The presence of the Equation Editor OLE object and the ".objupdate" directive strongly indicate the exploitation of this vulnerability. The decoded OLE object has high entropy, suggesting it is likely an executable payload.

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_off000011d8.bin` `80c2b3b49e210482976fce40cf0363db901739021b7b539f105e6cbdd1feb3ca`	rtf-objdata-decoded	RTF \objdata at offset 0x11D8	100386 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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