RTF / .DOC malware analysis — malicious · d18f9d7b2b610e3a

MALICIOUS

RTF / .DOC

310.8 KB

MD5: e7a722f821b1611714cbba0e464c4a47 SHA-1: ef6560d4b5ab808ae340fb014b7329331b7d4df2 SHA-256: d18f9d7b2b610e3a260b4e0ca36710d50c7f5ebe951edc2423df41317f092f2e

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File Execution: Malicious Code

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The `RTF_EQUATION_EDITOR` and `RTF_OBJUPDATE` heuristics indicate that this object is decoded and forces OLE activation, leading to the execution of a malicious payload. The `RTF_OBJDATA` heuristic further confirms the presence of embedded OLE object data. The extracted artifact `objdata_00_off000010ac.bin` is likely the decoded payload.

Heuristics 4

Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
\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
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_off000010ac.bin` `f1c3d7ed0829cff16f7f173902dd92fe3e4f9306d4865c09b5baa2224a8a4542`	rtf-objdata-decoded	RTF \objdata at offset 0x10AC	156694 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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