RTF malware analysis — malicious · 3cd56c1047be7a2c

MALICIOUS

RTF

7.2 KB First seen: 2019-08-04

MD5: d86ab4692f9b5483aaa969736fd63a0c SHA-1: 55173eb8062f7c1e2360a4d3a9e6de7214cb475f SHA-256: 3cd56c1047be7a2cc3c9fa54354f20e7b072d9da67ea6b64eef2ff8cc55c94c6

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 that leverages the Equation Editor vulnerability (CVE-2017-11882). The ".bin" artifact extracted from the objdata section is a strong indicator of shellcode, which is likely used to execute a secondary payload. The presence of ".objupdate" further suggests that the OLE object is designed to be activated automatically.

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	3644 bytes
SHA-256: `039bfa31698fce1465e3432f8b73ec7739570d5f9e4f31606fc132da1ebbc480`
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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