RTF malware analysis — malicious · f8983bc0ed39fc9d

MALICIOUS

RTF

66.6 KB Authoring application: riched20 6.3.9600

MD5: 9c9ff19affff6d62e72e618f2b7284da SHA-1: ba1490b1d318e9dc811e34ef10e1c0f6f5abcf80 SHA-256: f8983bc0ed39fc9dd4675eac5a02c7c24b0a9e57c34865bbe9f7117d4ad8321c

300 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF file contains embedded OLE objects, specifically triggering critical heuristics for Equation Editor exploitation. This indicates the file is designed to exploit CVE-2017-11882, a known vulnerability in Microsoft Equation Editor, to achieve arbitrary code execution. The embedded artifact also signals a suspicious PowerShell encoded command, suggesting a secondary payload execution.

Heuristics 7

Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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_off00000100.bin` `0acc143aa50bc00db447dd7f665b595bad4d00690c4a254a4bc014ade3e571d3`	rtf-objdata-decoded	RTF \objdata at offset 0x100	33458 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains a PowerShell -EncodedCommand style payload.

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