RTF / .DOC malware analysis — malicious · c06d7084a74bb8b6

MALICIOUS

RTF / .DOC

767.2 KB

MD5: c92550eb65a145f90e9cb55407e0fd0b SHA-1: c124bf4f541b23f7de2910ff7da22ca9d4394b2c SHA-256: c06d7084a74bb8b6821f726156c612bda6449101cd3fe049635caa9f34995ef8

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document containing an embedded OLE object that leverages the CVE-2017-11882 vulnerability in the Equation Editor. This vulnerability is known to be used for dropping and executing second-stage payloads. The high entropy of the decoded object suggests it contains packed or encrypted malicious code. No specific family could be identified, but the delivery mechanism is clear.

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.
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_off0000004d.bin` `043d2bc6efb43ed22ea3ce4b6dda05b68d17c9ed1a707a932ddbc197e3d4bf28`	rtf-objdata-decoded	RTF \objdata at offset 0x4D	392662 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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