RTF / .DOC malware analysis — malicious · af649d82b764ad86

MALICIOUS

RTF / .DOC

122.0 KB

MD5: 9015c20abeb003eff21a1c376c0e858f SHA-1: a99ef24bd1e6f43dbdcc3de3fa7f277a2a7edd80 SHA-256: af649d82b764ad869af9be5a3a1dc85fcaee4fb8bcf65d314244ed4f3f54ffea

182 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is an RTF document that contains an embedded OLE object. Heuristics indicate a critical vulnerability related to Equation Editor (CVE-2017-11882) was exploited. This vulnerability is known to be used to deliver second-stage payloads. The decoded object is a PE file, suggesting it is the payload. The document body is heavily obfuscated and unreadable, providing no direct clues to the lure.

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_off00000876.bin` `001631407bf17c0a007ab256c939e82c93efc594f6c92b88f0f9f7f399ff52f8`	rtf-objdata-decoded	RTF \objdata at offset 0x876	61319 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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