RTF / .DOC malware analysis — malicious · 998ee5404987706b

MALICIOUS

RTF / .DOC

435.7 KB

MD5: 91e4d1d1b20be93bcaaa2e693e0604fd SHA-1: e01531fe67b99f1e848ef41e87b00d4e13b81138 SHA-256: 998ee5404987706b8cf6677ada69b99cbc7ba45183d63b09ee57468e4595f869

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The sample is an RTF document containing an embedded OLE object that exploits CVE-2017-11882. The heuristic firings indicate the presence of an Equation Editor exploit, which is known to drop and execute a secondary payload. The extracted artifact 'objdata_00_off00001b20.bin' is likely this 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_off00001b20.bin` `c3a3ccbd659cda8b9ad70379b4c2873331958be86aa9b4e162ba3df3d67fe812`	rtf-objdata-decoded	RTF \objdata at offset 0x1B20	219475 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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