RTF malware analysis — malicious · d5be8da483be92ff

MALICIOUS

RTF

7.3 KB First seen: 2019-09-30

MD5: 38446f289a94287b124e2a183ae7d9de SHA-1: f2c0e0bb517521468b752054487ae04a8809cd26 SHA-256: d5be8da483be92ff7a56a548d8d2589f9e9f7fff1bb9eac834c64d8ce6cbd2e0

140 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 data indicative of shellcode, triggered by \objupdate. This strongly suggests exploitation of a vulnerability, likely within the Equation Editor component, to achieve arbitrary code execution. The presence of shellcode candidate regions and the RTF_EQUATION_EDITOR heuristic point to a common exploit delivery method.

Heuristics 4

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
\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_off00000033.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x33	3635 bytes
SHA-256: `0faf041ecefee70fa456b63d768fec712a9fb8b48af527c85a336790fd066197`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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