RTF malware analysis — malicious · 7a14ca5ae23a15d3

MALICIOUS

RTF

698.8 KB First seen: 2020-06-01

MD5: ce81cc8584aba7626eaa3ac2b8fc2f02 SHA-1: a5bc3b5ed13255d7e6d9af22b3b25734c2b30e73 SHA-256: 7a14ca5ae23a15d3f8c5b665c59a66015595ab68ba02fcdcc5072659d8691ee0

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an OLE object that exploits the Equation Editor vulnerability CVE-2017-11882. This vulnerability is known to be used to execute arbitrary code, and the presence of shellcode candidates within the extracted OLE object strongly suggests it's a second-stage payload. The document's structure and the specific heuristic firings directly point to this 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 medium 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_off000019d3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x19D3	354482 bytes
SHA-256: `827057543cac18b797f40445e827fe9ce369909ba6b653f66d3d6fbff77060b8`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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