RTF / .DOC malware analysis — malicious · f43f79d434a55685

MALICIOUS

RTF / .DOC

1.26 MB

MD5: 94d14490ba29a15e41576c25ecbd37fe SHA-1: d70bf75671345efb6dbb7c9f00fd3fc933b96c7e SHA-256: f43f79d434a5568542cac2e86a63a1a3b06e7d3200985ae0311eef75cd6c2ece

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF document contains embedded OLE objects, specifically related to Equation Editor, which strongly indicates exploitation of CVE-2017-11882. The large amount of hex-encoded data within the OLE object suggests it is used to hide a secondary payload. No document body text was available for further contextual analysis.

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1322KB of hex-encoded data inside \objdata sections — may hide a payload
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_off000000c9.bin` `7985bd5121d0a0f677da667f511aece1d7ed73904fb488f8007197418abe0cd2`	rtf-objdata-decoded	RTF \objdata at offset 0xC9	661489 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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