RTF malware analysis — malicious · 2f3773e217e51c9f

MALICIOUS

RTF

109.1 KB Created: 2020-08-27 11:53:00 First seen: 2020-09-15

MD5: 877ccb1a4cf2998bc5b9acec599d1dd2 SHA-1: f4dbb7a82202e1fd289bed3840663ceefd39f8f2 SHA-256: 2f3773e217e51c9fdf394a717adcb95c46b94f1429fcd29fdf43c6eee07e28f4

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that utilizes the Equation Editor CLSID, a known vector for exploiting vulnerabilities. Static triage identified a suspicious extracted artifact, likely shellcode, which strongly suggests exploitation for client execution. The embedded URL is confirmed benign and does not contribute to the malicious activity.

Heuristics 7

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
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000026a6.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x26A6	40238 bytes
SHA-256: `82cb9b08ee2a45a44257e390da90d703e5654d51b600d670fd2dc6c019f59c76`
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 7.43, consistent with packed or encrypted content.

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