RTF malware analysis — malicious · a175c61aec8a76e5

MALICIOUS

RTF

1.8 KB Authoring application: Riched20 6.3.9600 First seen: 2020-12-28

MD5: be8b92e50c2a5a8be16c1c288a7e976f SHA-1: 7fd30811dcce28766aab28b172b2cf03ad87a387 SHA-256: a175c61aec8a76e58f931c59eb060c3271f75b0848b127e5c17faeb379f0373e

280 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and specifically targets the Equation Editor, indicating an exploit for CVE-2018-0802. This vulnerability allows for the execution of arbitrary code when the embedded object is activated, likely delivered via spearphishing.

Heuristics 7

Equation Editor ProgID + OLE object high CVE related RTF_EQUATION_EDITOR

RTF references Equation.3 ProgID alongside \objdata — likely Equation Editor (CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798) but without the binary CLSID payload, so flagged at HIGH instead of CRITICAL.
ClamAV: Rtf.Exploit.CVE_2018_0802-6624871-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6624871-1
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
\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.
Suspicious extracted artifact high 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.
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000fe.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xFE	776 bytes
SHA-256: `11746611d070b6ce5a923005900550f41b453dede8727556686b0c9f6607a3b8`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): powershell.exe -noexit -windowstyle maximized

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