RTF malware analysis — malicious · 3a417e6d2deb098c

MALICIOUS

RTF

457.1 KB First seen: 2020-05-25

MD5: 9f7462774ccac0d2d692e7e1edd3c664 SHA-1: 247e6ffe96c503a1c6cc27cf563b6a4b58a9e03b SHA-256: 3a417e6d2deb098c55ad13f102bef27ccaaeb0fb90f6a4b3f508f4db3593442a

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data, specifically related to Microsoft Equation Editor. Heuristics indicate a critical vulnerability (CVE-2017-11882) was exploited, which typically decodes and executes a PE file. The extracted artifact 'objdata_00_off0000157b.bin' is the likely payload. The RTF_OBJUPDATE heuristic suggests that the OLE object is forced to activate, leading to the execution of the embedded exploit.

Heuristics 5

Decoded Equation Editor payload + PE critical CVE likely 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.
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.
\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_off0000157b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x157B	231241 bytes
SHA-256: `ecc9b7c88ee658938faaf3fff7ce1b54b5bd5def9190db67ae07bbadcec99b04`
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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