RTF malware analysis — malicious · c9c285f22e9ad928

MALICIOUS

RTF

291.5 KB First seen: 2020-04-06

MD5: dbbdeffad1f42c68d7b4b2e825afc74f SHA-1: 03307e321a7488cfbb5e5f944b4fed9646b76113 SHA-256: c9c285f22e9ad9289ce072eef4a1d1e01acadf87425f5c0efd253655bdd3e40c

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object with a ProgID indicative of Equation Editor, triggering the CVE-2017-11882 exploit. The ".bin" file extracted from the OLE object exhibits high entropy and MZ headers, suggesting it is a portable executable payload. The ".objupdate" directive further indicates that the OLE object is intended to be activated automatically, leading to the execution of the embedded exploit.

Heuristics 5

Split hex Equation Editor ProgID + OLE object critical CVE likely 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.
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_off00000088.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x88	149166 bytes
SHA-256: `d9d28b03eebf12122a8d01181262638b8f4a86918def4d44b5e1050425f285b9`
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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